{"id":65,"date":"2026-05-12T13:50:45","date_gmt":"2026-05-12T13:50:45","guid":{"rendered":"https:\/\/serviceagent.ai\/tools\/?page_id=65"},"modified":"2026-05-19T11:02:05","modified_gmt":"2026-05-19T11:02:05","slug":"garage-door-spring-calculator","status":"publish","type":"page","link":"https:\/\/serviceagent.ai\/tools\/garage-door-spring-calculator\/","title":{"rendered":"Garage Door Spring Calculator"},"content":{"rendered":"\n<style>.asc-wrap,.asc-wrap *,.asc-wrap *::before,.asc-wrap *::after{box-sizing:border-box !important;font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif !important;}.asc-wrap *{margin:0 !important;padding:0 !important;border:0 !important;background:transparent !important;color:inherit !important;font-size:inherit !important;font-weight:inherit !important;line-height:1.4 !important;text-decoration:none !important;list-style:none !important;box-shadow:none !important;max-width:none !important;min-width:0 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class=\"asc-hero\">\n<h1>Garage Door Spring Calculator<\/h1>\n<p>Use our free Garage Door Spring Calculator to quickly estimate the torque each spring must supply, the approximate spring rate, and the number of turns required based on inputs like door weight, cable drum radius, and number of springs. Perfect for garage door technicians, installers, and informed homeowners. Always verify specs with spring manufacturers and follow safe installation practice.<\/p>\n<a href=\"#asc-calculator\" class=\"asc-hero-cta\" id=\"asc-hero-cta\" onclick=\"if(!window.ascBooted){window.ascBooted=1;(new 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false;\">Get Started <span class=\"asc-hero-cta-arrow\" aria-hidden=\"true\">&#10148;<\/span><\/a>\n<\/div>\n<div class=\"asc-section\" id=\"asc-calculator\" style=\"padding:0 !important; margin:0 0 32px !important; background:transparent !important\">\n<div class=\"asc-calc-grid\">\n<div>\n<div class=\"asc-card\">\n<div class=\"asc-card-head\"><h3>Door Specifications<\/h3><\/div>\n<div class=\"asc-card-body\">\n<div class=\"asc-field\" id=\"asc-field-door-weight\"><label>Door Weight (lbs)<\/label><input type=\"number\" id=\"asc-door-weight\" min=\"1\" max=\"1500\" step=\"1\" value=\"200\" placeholder=\"Total door weight\" oninput=\"if(!window.ascBooted){window.ascBooted=1;(new 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')))();}window.ascCalc&#038;&#038;window.ascCalc();\"><p class=\"asc-err\" id=\"asc-door-weight-err\">Door weight must be 1-1500 lbs.<\/p><\/div>\n<div class=\"asc-field\" id=\"asc-field-door-height\"><label>Door Height (ft)<\/label><input type=\"number\" id=\"asc-door-height\" min=\"1\" max=\"12\" step=\"0.1\" value=\"7\" placeholder=\"Door height in feet\" oninput=\"if(!window.ascBooted){window.ascBooted=1;(new 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onkeyup=\"if(!window.ascBooted){window.ascBooted=1;(new 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onchange=\"if(!window.ascBooted){window.ascBooted=1;(new 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')))();}window.ascCalc&#038;&#038;window.ascCalc();\"><p class=\"asc-err\" id=\"asc-door-height-err\">Door height must be 1-12 ft.<\/p><\/div>\n<div class=\"asc-field\" id=\"asc-field-lift-type\"><label>Lift Type<\/label><select id=\"asc-lift-type\" oninput=\"if(!window.ascBooted){window.ascBooted=1;(new Function(atob('d2luZG93LmFzY0NhbGMgPSB3aW5kb3cuYXNjQ2FsYyB8fCAoZnVuY3Rpb24oKXsKICBmdW5jdGlvbiAkKGlkKXtyZXR1cm4gZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoaWQpO30KICBmdW5jdGlvbiBmbXQobil7dHJ5e3JldHVybiBuZXcgSW50bC5OdW1iZXJGb3JtYXQoJ2VuLVVTJyx7c3R5bGU6J2N1cnJlbmN5JyxjdXJyZW5jeTonVVNEJyxtaW5pbXVtRnJhY3Rpb25EaWdpdHM6Mn0pLmZvcm1hdChOdW1iZXIobil8fDApO31jYXRjaChfKXtyZXR1cm4gJyQnKygoTnVtYmVyKG4pfHwwKS50b0ZpeGVkKDIpKTt9fQogIGZ1bmN0aW9uIGZtdE51bShuLGQpe2Q9ZD09bnVsbD8yOmQ7cmV0dXJuIChOdW1iZXIobil8fDApLnRvTG9jYWxlU3RyaW5nKCdlbi1VUycse21pbmltdW1GcmFjdGlvbkRpZ2l0czpkLG1heGltdW1GcmFjdGlvbkRpZ2l0czpkfSk7fQogIGZ1bmN0aW9uIGZtdEludChuKXtyZXR1cm4gU3RyaW5nKE1hdGgucm91bmQoTnVtYmVyKG4pfHwwKSk7fQogIGZ1bmN0aW9uIHNldEZpZWxkRXJyb3IoZmllbGRJZCxtZXNzYWdlKXt2YXIgZj0kKGZpZWxkSWQpO3ZhciBlcnJJZD1maWVsZElkLnJlcGxhY2UoJ2FzYy1maWVsZC0nLCdhc2MtJykrJy1lcnInO3ZhciBlcnI9JChlcnJJZCk7aWYoIWYpcmV0dXJuO2lmKG1lc3NhZ2Upe2YuY2xhc3NMaXN0LmFkZCgnYXNjLWhhcy1lcnJvcicpO2lmKGVycillcnIudGV4dENvbnRlbnQ9bWVzc2FnZTt9ZWxzZXtmLmNsYXNzTGlzdC5yZW1vdmUoJ2FzYy1oYXMtZXJyb3InKTtpZihlcnIpZXJyLnRleHRDb250ZW50PScnO319CiAgZnVuY3Rpb24gc2V0VGV4dChpZCx2KXt2YXIgZWw9JChpZCk7aWYoZWwpZWwudGV4dENvbnRlbnQ9djt9CiAgZnVuY3Rpb24gc2V0SHRtbChpZCx2KXt2YXIgZWw9JChpZCk7aWYoZWwpZWwuaW5uZXJIVE1MPXY7fQogIGZ1bmN0aW9uIGdldE51bShpZCl7dmFyIGVsPSQoaWQpO3JldHVybiBlbD9wYXJzZUZsb2F0KGVsLnZhbHVlKTpOYU47fQogIGZ1bmN0aW9uIGdldFN0cihpZCl7dmFyIGVsPSQoaWQpO3JldHVybiBlbD9TdHJpbmcoZWwudmFsdWUpOicnO30KICBmdW5jdGlvbiBjYWxjKCl7CgogICAgdmFyIGhhc0Vycm9yPWZhbHNlOwogICAgdmFyIHdlaWdodD1nZXROdW0oJ2FzYy1kb29yLXdlaWdodCcpOwogICAgaWYoIWlzRmluaXRlKHdlaWdodCl8fHdlaWdodDw9MHx8d2VpZ2h0PjE1MDApe3NldEZpZWxkRXJyb3IoJ2FzYy1maWVsZC1kb29yLXdlaWdodCcsJ0Rvb3Igd2VpZ2h0IG11c3QgYmUgMS0xNTAwIGxicy4nKTtoYXNFcnJvcj10cnVlO30KICAgIGVsc2V7c2V0RmllbGRFcnJvcignYXNjLWZpZWxkLWRvb3Itd2VpZ2h0JyxudWxsKTt9CiAgICB2YXIgaGVpZ2h0PWdldE51bSgnYXNjLWRvb3ItaGVpZ2h0Jyk7CiAgICBpZighaXNGaW5pdGUoaGVpZ2h0KXx8aGVpZ2h0PD0wfHxoZWlnaHQ+MTIpe3NldEZpZWxkRXJyb3IoJ2FzYy1maWVsZC1kb29yLWhlaWdodCcsJ0Rvb3IgaGVpZ2h0IG11c3QgYmUgMS0xMiBmdC4nKTtoYXNFcnJvcj10cnVlO30KICAgIGVsc2V7c2V0RmllbGRFcnJvcignYXNjLWZpZWxkLWRvb3ItaGVpZ2h0JyxudWxsKTt9CiAgICB2YXIgZHJ1bT1nZXROdW0oJ2FzYy1kcnVtLXNpemUnKTsKICAgIGlmKCFpc0Zpbml0ZShkcnVtKXx8ZHJ1bTw9MCl7c2V0RmllbGRFcnJvcignYXNjLWZpZWxkLWRydW0tc2l6ZScsJ0RydW0gc2l6ZSBtdXN0IGJlIHBvc2l0aXZlLicpO2hhc0Vycm9yPXRydWU7fQogICAgZWxzZXtzZXRGaWVsZEVycm9yKCdhc2MtZmllbGQtZHJ1bS1zaXplJyxudWxsKTt9CiAgICB2YXIgY3c9ZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoJ2FzYy1jeWNsZS13YXJuaW5nJyk7CiAgICB2YXIgc3c9ZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoJ2FzYy1zYWZldHktd2FybmluZycpOwogICAgaWYoaGFzRXJyb3IpewogICAgICBzZXRUZXh0KCdhc2Mtc3ByaW5nLWxlbmd0aCcsJzAgaW4nKTtzZXRUZXh0KCdhc2MtcmVxdWlyZWQtdG9ycXVlJywnMCBpbi1sYnMnKTsKICAgICAgc2V0VGV4dCgnYXNjLW51bWJlci1vZi10dXJucycsJzAnKTtzZXRUZXh0KCdhc2MtZXN0aW1hdGVkLWN5Y2xlcycsJzAnKTsKICAgICAgc2V0VGV4dCgnYXNjLXNhZmV0eS1mYWN0b3InLCcwJyk7c2V0VGV4dCgnYXNjLXNwcmluZy1jb25zdGFudCcsJzAgaW4tbGJzL3R1cm4nKTsKICAgICAgaWYoY3cpY3cuc3R5bGUuZGlzcGxheT0nbm9uZSc7aWYoc3cpc3cuc3R5bGUuZGlzcGxheT0nbm9uZSc7CiAgICAgIHJldHVybjsKICAgIH0KICAgIHZhciBsaWZ0PWdldFN0cignYXNjLWxpZnQtdHlwZScpfHwnc3RhbmRhcmQnOwogICAgdmFyIGxpZnRNdWw9bGlmdD09PSdoaWdoJz8xLjE1OmxpZnQ9PT0ndmVydGljYWwnPzEuMzoxLjA7CiAgICB2YXIgc3ByaW5ncz1wYXJzZUludChnZXRTdHIoJ2FzYy1udW1iZXItb2Ytc3ByaW5ncycpfHwnMicsMTApfHwyOwogICAgdmFyIHNwcmluZ0RpYT1wYXJzZUZsb2F0KGdldFN0cignYXNjLXNwcmluZy1kaWFtZXRlcicpfHwnMi4wJyl8fDIuMDsKICAgIHZhciB3aXJlRGlhPXBhcnNlRmxvYXQoZ2V0U3RyKCdhc2Mtd2lyZS1zaXplJyl8fCcwLjI1Jyl8fDAuMjU7CiAgICB2YXIgdG90YWxUb3JxdWU9KHdlaWdodCpkcnVtKmxpZnRNdWwpLzI7CiAgICB2YXIgcGVyU3ByaW5nPXRvdGFsVG9ycXVlL3NwcmluZ3M7CiAgICB2YXIgbWVhbkRpYT1zcHJpbmdEaWEtd2lyZURpYTsKICAgIHZhciBzcHJpbmdDb25zdD0oMTE1MDAwMDAqTWF0aC5wb3cod2lyZURpYSw0KSkvKDgqTWF0aC5wb3cobWVhbkRpYSwzKSk7CiAgICB2YXIgbGVuZ3RoSW49TWF0aC5jZWlsKChwZXJTcHJpbmcvc3ByaW5nQ29uc3QpKjEyKTsKICAgIHZhciB0dXJucz0oaGVpZ2h0KjQpLyhNYXRoLlBJKmRydW0vMTIpOwogICAgdmFyIHN0cmVzcz0oOCpwZXJTcHJpbmcqbWVhbkRpYSkvKE1hdGguUEkqTWF0aC5wb3cod2lyZURpYSwzKSk7CiAgICB2YXIgY3ljbGVzPU1hdGgubWF4KDUwMDAsTWF0aC5taW4oNTAwMDAsMTAwMDAwLShzdHJlc3MqNTApKSk7CiAgICB2YXIgc2FmZXR5PXNwcmluZ0NvbnN0Kmxlbmd0aEluL3BlclNwcmluZzsKICAgIHNldFRleHQoJ2FzYy1zcHJpbmctbGVuZ3RoJyxmbXRJbnQobGVuZ3RoSW4pKycgaW4nKTsKICAgIHNldFRleHQoJ2FzYy1yZXF1aXJlZC10b3JxdWUnLGZtdE51bShwZXJTcHJpbmcsMSkrJyBpbi1sYnMnKTsKICAgIHNldFRleHQoJ2FzYy1udW1iZXItb2YtdHVybnMnLGZtdE51bSh0dXJucywyKSk7CiAgICBzZXRUZXh0KCdhc2MtZXN0aW1hdGVkLWN5Y2xlcycsZm10SW50KGN5Y2xlcykpOwogICAgc2V0VGV4dCgnYXNjLXNhZmV0eS1mYWN0b3InLGZtdE51bShzYWZldHksMikpOwogICAgc2V0VGV4dCgnYXNjLXNwcmluZy1jb25zdGFudCcsZm10TnVtKHNwcmluZ0NvbnN0LDIpKycgaW4tbGJzL3R1cm4nKTsKICAgIGlmKGN3KWN3LnN0eWxlLmRpc3BsYXk9Y3ljbGVzPDEwMDAwPydibG9jayc6J25vbmUnOwogICAgaWYoc3cpc3cuc3R5bGUuZGlzcGxheT1zYWZldHk8MS4yPydibG9jayc6J25vbmUnOwogIAogIH0KICByZXR1cm4gY2FsYzsKfSkoKTsKd2luZG93LmFzY1Jlc2V0ID0gd2luZG93LmFzY1Jlc2V0IHx8IGZ1bmN0aW9uKCl7dmFyICQ9ZnVuY3Rpb24oaWQpe3JldHVybiBkb2N1bWVudC5nZXRFbGVtZW50QnlJZChpZCk7fTtpZigkKCdhc2MtZG9vci13ZWlnaHQnKSkkKCdhc2MtZG9vci13ZWlnaHQnKS52YWx1ZT0iMjAwIjtpZigkKCdhc2MtZG9vci1oZWlnaHQnKSkkKCdhc2MtZG9vci1oZWlnaHQnKS52YWx1ZT0iNyI7aWYoJ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onchange=\"if(!window.ascBooted){window.ascBooted=1;(new 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value=\"standard\" selected>Standard Lift (1.00x)<\/option><option value=\"high\">High Lift (1.15x)<\/option><option value=\"vertical\">Vertical Lift (1.30x)<\/option><\/select><p class=\"asc-err\" id=\"asc-lift-type-err\"><\/p><\/div>\n<div class=\"asc-field\" id=\"asc-field-drum-size\"><label>Drum Size (in)<\/label><input type=\"number\" id=\"asc-drum-size\" min=\"1\" max=\"48\" step=\"0.5\" value=\"12\" placeholder=\"Cable drum diameter\" oninput=\"if(!window.ascBooted){window.ascBooted=1;(new 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onkeyup=\"if(!window.ascBooted){window.ascBooted=1;(new 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onchange=\"if(!window.ascBooted){window.ascBooted=1;(new 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CgnYXNjLWxpZnQtdHlwZScpKSQoJ2FzYy1saWZ0LXR5cGUnKS52YWx1ZT0ic3RhbmRhcmQiO2lmKCQoJ2FzYy1kcnVtLXNpemUnKSkkKCdhc2MtZHJ1bS1zaXplJykudmFsdWU9IjEyIjtpZigkKCdhc2Mtc3ByaW5nLWRpYW1ldGVyJykpJCgnYXNjLXNwcmluZy1kaWFtZXRlcicpLnZhbHVlPSIyLjAiO2lmKCQoJ2FzYy13aXJlLXNpemUnKSkkKCdhc2Mtd2lyZS1zaXplJykudmFsdWU9IjAuMjUiO2lmKCQoJ2FzYy1udW1iZXItb2Ytc3ByaW5ncycpKSQoJ2FzYy1udW1iZXItb2Ytc3ByaW5ncycpLnZhbHVlPSIyIjt3aW5kb3cuYXNjQ2FsYyYmd2luZG93LmFzY0NhbGMoKTt9Owp3aW5kb3cuYXNjU2Nyb2xsID0gd2luZG93LmFzY1Njcm9sbCB8fCBmdW5jdGlvbigpe3ZhciB0PWRvY3VtZW50LmdldEVsZW1lbnRCeUlkKCdhc2MtY2FsY3VsYXRvcicpO2lmKHQmJnQuc2Nyb2xsSW50b1ZpZXcpdC5zY3JvbGxJbnRvVmlldyh7YmVoYXZpb3I6J3Ntb290aCcsYmxvY2s6J3N0YXJ0J30pO307CndpbmRvdy5hc2NUb2dnbGUgPSB3aW5kb3cuYXNjVG9nZ2xlIHx8IGZ1bmN0aW9uKGlkKXt2YXIgYm94PWRvY3VtZW50LmdldEVsZW1lbnRCeUlkKGlkKTtpZighYm94KXJldHVybjt2YXIgaGlkZGVuPWJveC5zdHlsZS5kaXNwbGF5PT09J25vbmUnfHwhYm94LnN0eWxlLmRpc3BsYXk7Ym94LnN0eWxlLmRpc3BsYXk9aGlkZGVuPydibG9jayc6J25vbmUnO3ZhciBoZHI9ZG9jdW1lbnQucXVlcnlTZWxlY3RvcignW2FyaWEtY29udHJvbHM9IicraWQrJyJdJyk7aWYoaGRyKWhkci5zZXRBdHRyaWJ1dGUoJ2FyaWEtZXhwYW5kZWQnLGhpZGRlbj8ndHJ1ZSc6J2ZhbHNlJyk7fTsKd2luZG93LmFzY0NhbGMmJndpbmRvdy5hc2NDYWxjKCk7')))();}window.ascCalc&#038;&#038;window.ascCalc();\"><p class=\"asc-err\" id=\"asc-drum-size-err\">Drum size must be positive.<\/p><\/div>\n<div class=\"asc-field\" id=\"asc-field-spring-diameter\"><label>Spring Inside Diameter (in)<\/label><select id=\"asc-spring-diameter\" oninput=\"if(!window.ascBooted){window.ascBooted=1;(new Function(atob('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onchange=\"if(!window.ascBooted){window.ascBooted=1;(new 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value=\"1.75\">1.75&#8243;<\/option><option value=\"2.0\" selected>2.0&#8243;<\/option><option value=\"2.25\">2.25&#8243;<\/option><option value=\"2.5\">2.5&#8243;<\/option><\/select><p class=\"asc-err\" id=\"asc-spring-diameter-err\"><\/p><\/div>\n<div class=\"asc-field\" id=\"asc-field-wire-size\"><label>Wire Size (in)<\/label><select id=\"asc-wire-size\" oninput=\"if(!window.ascBooted){window.ascBooted=1;(new 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onchange=\"if(!window.ascBooted){window.ascBooted=1;(new 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value=\"0.192\">0.192&#8243;<\/option><option value=\"0.207\">0.207&#8243;<\/option><option value=\"0.218\">0.218&#8243;<\/option><option value=\"0.225\">0.225&#8243;<\/option><option value=\"0.243\">0.243&#8243;<\/option><option value=\"0.25\" selected>0.25&#8243;<\/option><option value=\"0.262\">0.262&#8243;<\/option><\/select><p class=\"asc-err\" id=\"asc-wire-size-err\"><\/p><\/div>\n<div class=\"asc-field\" id=\"asc-field-number-of-springs\"><label>Number of Springs<\/label><select id=\"asc-number-of-springs\" oninput=\"if(!window.ascBooted){window.ascBooted=1;(new 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value=\"1\">1 Spring<\/option><option value=\"2\" selected>2 Springs (Pair)<\/option><\/select><p class=\"asc-err\" id=\"asc-number-of-springs-err\"><\/p><\/div>\n<div class=\"asc-actions\"><button type=\"button\" class=\"asc-btn asc-btn-primary\" id=\"asc-calculate\" onclick=\"if(!window.ascBooted){window.ascBooted=1;(new 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false;\">Calculate Springs<\/button><button type=\"button\" class=\"asc-btn asc-btn-reset\" id=\"asc-reset\" onclick=\"if(!window.ascBooted){window.ascBooted=1;(new 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false;\">Reset<\/button><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"asc-card\">\n<div class=\"asc-card-head asc-card-head-purple\"><h3>Calculation Results<\/h3><\/div>\n<div class=\"asc-card-body\">\n<div class=\"asc-summary-hero\"><p class=\"asc-summary-hero-label\">Recommended Spring Length<\/p><p class=\"asc-summary-hero-val\" id=\"asc-spring-length\">0 in<\/p><\/div>\n<div class=\"asc-summary-grid\">\n<div class=\"asc-summary-cell\"><p class=\"asc-summary-label\">Required Torque<\/p><p class=\"asc-summary-val\" id=\"asc-required-torque\">0 in-lbs<\/p><\/div>\n<div class=\"asc-summary-cell\"><p class=\"asc-summary-label\">Number of Turns<\/p><p class=\"asc-summary-val\" id=\"asc-number-of-turns\">0<\/p><\/div>\n<\/div>\n<div style=\"height:14px\"><\/div>\n<div class=\"asc-summary-grid\">\n<div class=\"asc-summary-cell\"><p class=\"asc-summary-label\">Estimated Cycles<\/p><p class=\"asc-summary-val\" id=\"asc-estimated-cycles\">0<\/p><\/div>\n<div class=\"asc-summary-cell\"><p class=\"asc-summary-label\">Safety Factor<\/p><p class=\"asc-summary-val\" id=\"asc-safety-factor\">0<\/p><\/div>\n<\/div>\n<div class=\"asc-summary-sep\"><\/div>\n<div class=\"asc-summary-list\">\n<div class=\"asc-summary-row\"><span class=\"asc-summary-row-key\">Spring Constant<\/span><span class=\"asc-summary-row-val\" id=\"asc-spring-constant\">0 in-lbs\/turn<\/span><\/div>\n<\/div>\n<p id=\"asc-cycle-warning\" style=\"display:none !important;margin:14px 0 0 !important;padding:12px 14px !important;background:#fdecea !important;border:1px solid #f5c2c0 !important;border-radius:10px !important;font-size:13px !important;color:#a23a36 !important;line-height:1.55 !important;text-align:center !important\">Low cycle-life expectancy. Consider a larger wire size.<\/p>\n<p id=\"asc-safety-warning\" style=\"display:none !important;margin:10px 0 0 !important;padding:12px 14px !important;background:#fdecea !important;border:1px solid #f5c2c0 !important;border-radius:10px !important;font-size:13px !important;color:#a23a36 !important;line-height:1.55 !important;text-align:center !important\">Low safety factor. Spring may be undersized \u2014 verify with supplier tables.<\/p>\n<p style=\"display:block !important;margin:18px 0 0 !important;padding:12px 14px !important;background:#faf7ff !important;border-radius:10px !important;font-size:12px !important;color:#5a5570 !important;text-align:center !important;line-height:1.55 !important\">Engineering estimate. Verify final spring selection with manufacturer tables and a qualified installer.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"asc-foot\">All calculations are estimates and should be verified by a professional.<\/p>\n<div class=\"asc-section asc-section-soft\"><div class=\"asc-narrow\"><h2 class=\"asc-section-title\">Garage Door Spring Formula<\/h2><div class=\"asc-code asc-formula\">Required torque (per spring)\nT_req = (W \u00d7 r) \/ N_s\n\nwhere\nW = Door weight (lbs)\nr = Cable drum radius (in)\nN_s = Number of springs\n\nUnits \u2192 inch-pounds (in\u00b7lb)\n\nApproximate spring rate (torque per turn) \u2014 engineering approximation for torsion springs (varies by standard):\n\nk \u2248 (G \u00d7 d\u2074) \/ (10.8 \u00d7 D\u00b3 \u00d7 N)\n\nwhere\nG = Shear modulus (psi) \u2014 typical steel \u2248 11.5 \u00d7 10\u2076 psi\nd = wire diameter (in)\nD = mean coil diameter (in)\nN = active coils (number)\n\nResulting units: in\u00b7lb per radian or in\u00b7lb per turn depending on constant used \u2014 the constant above yields torque per turn in in\u00b7lb (approx). Manufacturer tables are recommended.\n\nEstimated turns to wind\nTurns \u2248 T_req \/ k<\/div><div class=\"asc-code asc-example\"><span class=\"asc-example-label\">Example<\/span>Door weight W = 200 lb, drum radius r = 2 in, two springs N_s = 2 \u2192\n\nT_req = (200 \u00d7 2) \/ 2 = 200 in\u00b7lb per spring.\n\nSuppose a spring with properties gives k \u2248 25 in\u00b7lb per turn \u2192\nRequired turns = 200 \u00f7 25 = 8 turns.<\/div><div class=\"asc-copy\"><p>Start from the door weight and drum radius to compute torque required. Use spring geometry + material to estimate spring rate k then compute turns = torque \u00f7 k. Real-world spring specs are provided by manufacturers (wire gauge, coil diameter, active coils, free length); this calculator estimates values for selection and setup. Always verify with supplier curves and local codes.<\/p><\/div><\/div><\/div>\n<div class=\"asc-section\"><div class=\"asc-narrow\"><h2 class=\"asc-section-title\">How this garage door spring calculator works<\/h2><div class=\"asc-copy\"><p>The calculator converts the door weight into torque required at the cable drum, divides the torque across the number of installed springs, and then uses spring geometry and material properties to estimate the torsion spring rate (torque per turn). From that rate it estimates how many turns are needed to balance the door. This gives installers a quick verification before ordering springs or making adjustments. For safety and warranty reasons, final sizing and installation must use manufacturer tables and professional installers.<\/p><\/div><\/div><\/div>\n<div class=\"asc-section asc-section-soft\"><div class=\"asc-narrow\"><h2 class=\"asc-section-title\">When to use this garage door spring calculator<\/h2><div class=\"asc-check-grid\"><div class=\"asc-check-card\"><span class=\"asc-check-icon\" aria-hidden=\"true\">&#10003;<\/span><p>When ordering replacement torsion springs to match door weight and drum size<\/p><\/div><div class=\"asc-check-card\"><span class=\"asc-check-icon\" aria-hidden=\"true\">&#10003;<\/span><p>To estimate initial wind turns when setting up a new spring installation<\/p><\/div><div class=\"asc-check-card\"><span class=\"asc-check-icon\" aria-hidden=\"true\">&#10003;<\/span><p>For cross-checking supplier spring codes vs. calculated torque\/turns<\/p><\/div><div class=\"asc-check-card\"><span class=\"asc-check-icon\" aria-hidden=\"true\">&#10003;<\/span><p>During training or planning for balanced door performance and cycle life<\/p><\/div><div class=\"asc-check-card\"><span class=\"asc-check-icon\" aria-hidden=\"true\">&#10003;<\/span><p>When confirming that a door is within a spring&#39;s rated torque capacity<\/p><\/div><\/div><\/div><\/div>\n<div class=\"asc-section\" style=\"padding:0 !important; background:transparent !important\"><div class=\"asc-cta-card\"><div class=\"asc-cta-grid\"><div class=\"asc-cta-copy\"><h3>Want to make your door installs faster and safer?<\/h3><p>Use ServiceAgent.ai to automate job estimates, store spring supplier specs, generate installation checklists, and track warranty and cycle-life data\u2014streamline quoting to install.<\/p><a href=\"https:\/\/cal.so\/service-agent-demo\" class=\"asc-cta-btn\">Book a Free Demo <span class=\"asc-cta-btn-arrow\" aria-hidden=\"true\">&#10148;<\/span><\/a><\/div><div class=\"asc-cta-art\">ServiceAgent ROI Calculator<\/div><\/div><\/div><\/div>\n<div class=\"asc-section asc-section-bench\"><div class=\"asc-narrow\"><h2 class=\"asc-section-title\">Typical Torsion Spring Ranges &amp; Notes<\/h2><p class=\"asc-bench-intro\">Common practical guidance for quick checks\u2014always validate with supplier tables:<\/p><div class=\"asc-bench-grid\"><div class=\"asc-bench-card\"><div class=\"asc-bench-head\"><span class=\"asc-bench-icon\"><svg width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M3 12l2-2 4 4 8-8 4 4\" stroke=\"#7456da\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><h4>Typical drum radius<\/h4><\/div><p class=\"asc-bench-val\">1.5\u20132.5 in (larger drums change required torque)<\/p><\/div><div class=\"asc-bench-card\"><div class=\"asc-bench-head\"><span class=\"asc-bench-icon\"><svg width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M3 12l2-2 4 4 8-8 4 4\" stroke=\"#7456da\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><h4>Common turns at install<\/h4><\/div><p class=\"asc-bench-val\">4\u201312 turns per spring for residential doors (depends on door height and drum)<\/p><\/div><div class=\"asc-bench-card\"><div class=\"asc-bench-head\"><span class=\"asc-bench-icon\"><svg width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M3 12l2-2 4 4 8-8 4 4\" stroke=\"#7456da\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><h4>Typical spring rates (order of magnitude)<\/h4><\/div><p class=\"asc-bench-val\">10\u201340 in\u00b7lb per turn depending on wire and diameter<\/p><\/div><div class=\"asc-bench-card\"><div class=\"asc-bench-head\"><span class=\"asc-bench-icon\"><svg width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M3 12l2-2 4 4 8-8 4 4\" stroke=\"#7456da\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><h4>Wire sizes<\/h4><\/div><p class=\"asc-bench-val\">residential springs commonly use wire diameters from 0.175&quot; to 0.300&quot; depending on door weight and cycles<\/p><\/div><div class=\"asc-bench-card\"><div class=\"asc-bench-head\"><span class=\"asc-bench-icon\"><svg width=\"22\" height=\"22\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M3 12l2-2 4 4 8-8 4 4\" stroke=\"#7456da\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><h4>Cycle life vs. spring geometry<\/h4><\/div><p class=\"asc-bench-val\">thicker wire and larger diameter springs generally increase torque capacity but change cycle life trade-offs<\/p><\/div><\/div><div class=\"asc-callout\"><p>Use these ranges to check whether a candidate spring code is plausible. Final selection must be confirmed with manufacturer specs and load testing.<\/p><\/div><\/div><\/div>\n<div class=\"asc-section asc-section-soft\"><div class=\"asc-narrow\"><h2 class=\"asc-section-title\">Frequently Asked Questions<\/h2><div class=\"asc-faq-list\"><details class=\"asc-faq-item\" open><summary class=\"asc-faq-q\">How accurate is this garage door spring calculator?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>It provides engineering-based estimates. Final spring selection and safe installation require manufacturer tables and a trained installer.<\/p><\/div><\/details><details class=\"asc-faq-item\"><summary class=\"asc-faq-q\">How many turns do most residential springs need?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>Many residential doors use roughly 4\u201312 turns per spring at installation, depending on door height and drum diameter.<\/p><\/div><\/details><details class=\"asc-faq-item\"><summary class=\"asc-faq-q\">Can I adjust a spring by myself?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>No\u2014torsion springs store dangerous energy. Adjustment or replacement should only be performed by trained professionals with appropriate tools.<\/p><\/div><\/details><details class=\"asc-faq-item\"><summary class=\"asc-faq-q\">What if my door has extension springs (not torsion)?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>This tool focuses on torsion spring setups (shaft + drums). Extension springs use different balancing calculations and safety requirements.<\/p><\/div><\/details><details class=\"asc-faq-item\"><summary class=\"asc-faq-q\">Why do manufacturers provide spring codes instead of my calculated values?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>Manufacturers publish tested spring codes (wire, diameter, coils, free length) and load curves that are safer and more precise than raw calculations\u2014use their tables to pick a match.<\/p><\/div><\/details><details class=\"asc-faq-item\"><summary class=\"asc-faq-q\">Does drum radius change the result a lot?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>Yes\u2014larger drum radius increases mechanical advantage and reduces required spring turns for the same door weight (but changes cable wrap and travel). Always measure the effective drum radius.<\/p><\/div><\/details><details class=\"asc-faq-item\"><summary class=\"asc-faq-q\">What inputs give the biggest uncertainty?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>Wire diameter, mean coil diameter, and accurate active coil count (N) are most sensitive; material G may vary slightly. Use supplier data for precise k.<\/p><\/div><\/details><details class=\"asc-faq-item\"><summary class=\"asc-faq-q\">Can this calculator help with cycle-life planning?<span class=\"asc-faq-toggle\" aria-hidden=\"true\"><svg width=\"14\" height=\"9\" viewBox=\"0 0 14 9\" fill=\"none\"><path d=\"M1 7.5L7 1.5L13 7.5\" stroke=\"currentColor\" stroke-width=\"2\"\/><\/svg><\/span><\/summary><div class=\"asc-faq-a\"><p>It helps estimate torque and spring load, which inform cycle-life trade-offs, but cycle-life depends on material heat treatment, shot-peening, and manufacturing\u2014use supplier cycle ratings for planning.<\/p><\/div><\/details><\/div><\/div><\/div>\n<div class=\"asc-section\"><div class=\"asc-narrow\"><h2 class=\"asc-section-title\">Looking for other useful tools?<\/h2><div class=\"asc-rel-grid\"><a href=\"https:\/\/serviceagent.ai\/tools\/concrete-calculator\/\" class=\"asc-rel-card\"><span class=\"asc-rel-card-label\">Concrete Calculator<\/span><\/a><a href=\"https:\/\/serviceagent.ai\/tools\/square-footage-calculator\/\" class=\"asc-rel-card\"><span class=\"asc-rel-card-label\">Square Footage Calculator<\/span><\/a><a href=\"https:\/\/serviceagent.ai\/tools\/stair-calculator\/\" class=\"asc-rel-card\"><span class=\"asc-rel-card-label\">Stair Calculator<\/span><\/a><\/div><\/div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Garage Door Spring Calculator Use our free Garage Door Spring Calculator to quickly estimate the torque each spring must supply, the approximate spring rate, and the number of turns required based on inputs like door weight, cable drum radius, and number of springs. Perfect for garage door technicians, installers, and informed homeowners. Always verify specs [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-no-title","meta":{"footnotes":""},"class_list":["post-65","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Garage Door Spring Calculator | Free Online Calculator<\/title>\n<meta name=\"description\" content=\"Calculate results instantly with our free Garage Door Spring Calculator. See clear breakdowns, plan smarter, and save time. 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