Amortization Schedule Calculator

Use our free Amortization Schedule Calculator to quickly estimate monthly loan payments and view a full breakdown of principal vs. interest over the loan term. Perfect for borrowers, homeowners, and financial planners.

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Amortization Formula

Monthly Payment = P × [ r(1 + r)^n ÷ ((1 + r)^n − 1) ]\n\nWhere:\nP = loan amount (principal)\nr = monthly interest rate (APR ÷ 12)\nn = total number of payments (months)
Example:
Loan Amount = $250,000; APR = 5%; Term = 30 years (360 months)\nr = 0.05 ÷ 12 = 0.004167\nMonthly Payment = 250,000 × [0.004167(1.004167^360) ÷ (1.004167^360 − 1)] ≈ $1,342\n\nOver 30 years:\nTotal Paid ≈ $483,000\nInterest Paid ≈ $233,000\nPrincipal Paid = $250,000

Amortization schedules show you how much of each payment goes to principal vs. interest, and how extra payments shorten your loan term.

How this amortization schedule calculator works

This calculator estimates your monthly loan payment and generates a payment schedule over the full loan term. It applies the standard amortization formula to split each payment into principal and interest, giving borrowers a clear view of repayment progress.

When to use this amortization schedule calculator

Planning a new mortgage, auto loan, or personal loan

Comparing loan terms and interest rates before borrowing

Evaluating how extra payments reduce interest and shorten loan length

Preparing schedules for clients as a financial advisor or lender

Benchmarking affordability before committing to a loan

Want to make your loan planning smarter?

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

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Average Profit Margins by Industry

Understand how lending compares to other industries. Below are typical profit margin ranges across financial and service businesses:

Mortgage Lenders

15–25%
net margin

Banks & Financial Institutions

20–30%
net margin

Real Estate Agents/Brokerages

15–30%
net margin

Roofing Contractors

20–40%
net margin

HVAC Contractors

10–20%
net margin

Plumbing Contractors

20–35%
net margin

Electrical Contractors

15–25%
net margin

Construction/Contracting

15–30%
net margin

These benchmarks help lenders, borrowers, and advisors evaluate competitiveness and profitability.

Frequently Asked Questions

It uses the standard amortization formula for reliable results. Actual payments may vary with fees or rate adjustments.

Loan amount, interest rate, and loan term length.

Yes—just enter the loan details for any type of amortized loan.

Yes—add extra payments to see how they reduce interest and shorten the loan.

Yes—enter your loan start date to generate a true month-by-month schedule.

No—it only shows principal and interest. Add escrow items separately.

It shows exactly how payments reduce your balance over time, making budgeting and prepayment planning easier.

Pair it with ServiceAgent.ai to generate automated amortization schedules for client proposals and loan tracking.

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