Refinance Calculator

Use our free refinance calculator to estimate how much you could save by refinancing your mortgage, car loan, or personal loan. Compare your current loan terms with a new interest rate, loan term, and closing costs to see your potential monthly savings and payoff timeline. Refinancing can lower your monthly payment, reduce interest costs, or shorten your loan term—but it isn’t always beneficial. This calculator helps you decide objectively by calculating your break-even point (when savings exceed refinancing costs) and total lifetime savings. With real-time results, you can determine whether refinancing now makes financial sense based on current rates and your personal goals.

Refinance Formula

Monthly Payment (Principal & Interest) = P × [ r(1 + r)^n ÷ ((1 + r)^n − 1) ] Where: P = principal (loan amount) r = monthly interest rate (annual rate ÷ 12) n = number of months in the loan term Savings = Current Monthly Payment − New Monthly Payment Break-even Point (months) = Closing Costs ÷ Monthly Savings
Example:
Current loan: $250,000 at 6% for 30 years = $1,499/mo Refinance loan: $250,000 at 5% for 30 years = $1,342/mo Savings = $1,499 − $1,342 = $157/mo If closing costs are $3,000 → Break-even = 3,000 ÷ 157 ≈ 19 months

This formula helps you determine whether a refinance saves or costs you money in the long run. Lower interest rates don’t always mean total savings—closing costs, loan terms, and your time horizon all matter. The Refinance Calculator simplifies this comparison instantly, helping you make smarter, data-driven decisions.

How this refinance calculator works

This calculator compares your existing loan details with a potential new loan to show immediate and long-term financial impacts.

Here’s what it considers:

Current Loan Details: Your existing balance, interest rate, and remaining term.
New Loan Details: Your proposed rate, loan term, and any fees or closing costs.
Monthly Payment Change: How your payment will increase or decrease.
Break-even Point: How long it takes to recover refinancing costs through lower payments.
Total Interest Savings: How much less you’ll pay in interest over the life of the new loan.
New Payoff Date: See if refinancing shortens or extends your loan timeline.

When to use this refinance calculator

Refinancing can be powerful—but timing and context are everything. Use this calculator to find your best opportunity.

When rates drop: Check if today’s lower interest rates justify a refinance.

To shorten your term: See how a 15-year refinance compares to your current 30-year loan.

To reduce payments: Evaluate options for lowering monthly expenses.

When cashing out equity: Estimate how borrowing extra affects total cost and payments.

Before paying off early: Test whether refinancing with no closing costs is worth it.

To consolidate debt: Compare the cost of combining multiple debts into one refinanced loan.

Want to make your refinancing smarter?

Use ServiceAgent.ai to automate estimates, manage proposals, and track profitability—all from one dashboard.

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ServiceAgent ROI Calculator

Average Refinancing Costs and Rates

Use these benchmarks to understand typical refinance ranges before you commit.

Average mortgage refinance rate

6.25%–7.0% (fixed)
net margin

Average auto refinance rate

5.5%–9%
net margin

Typical refinance closing costs

2%–5% of loan amount
net margin

Average break-even time

18–24 months
net margin

Minimum equity required

20% for most conventional loans
net margin

No-closing-cost refinance premium

+0.25%–0.5% on the rate
net margin

These benchmarks help you determine whether your refinance quote is competitive or worth negotiating.

Frequently Asked Questions

It’s a tool that compares your current loan to a new one to show how much money you can save—or lose—by refinancing.

By lowering your interest rate or shortening your term, you pay less total interest over the life of the loan.

Yes—enter the loan balance, new rate, and term.

Yes—it divides closing costs by monthly savings to show when refinancing pays off.

No—the calculator shows principal and interest only. Add escrow separately.

It means estimating how much money you could save in total interest, monthly payments, or loan duration if you refinance your current loan to one with better terms.

If you'll sell before reaching the break-even point, refinancing may not be worth it.

Pair it with ServiceAgent.ai to create automated refinancing proposals and client reports.