Money & Finance

Mortgage Calculator

Estimate a fixed-rate mortgage payment, total interest and total of payments from the loan amount, interest rate and term.

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Mortgage Calculator

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Mortgage Payments & Amortization

Mortgage payment formulas, amortization schedules, extra principal and worked loan-payment scenarios.

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How to use this mortgage calculator

Enter the requested values above and select Calculate. The result updates immediately on the page, so you can change one value and compare different scenarios without leaving the calculator.

Formula and method

Monthly payment = P × r(1+r)^n ÷ ((1+r)^n − 1), where r is the monthly interest rate and n is the number of monthly payments.

Example

For a $300,000 loan at 6.5% for 30 years, the calculator estimates the monthly principal-and-interest payment and lifetime interest.

What this calculator is useful for

Estimate a fixed-rate mortgage payment, total interest and total of payments from the loan amount, interest rate and term. It is designed for quick estimates and everyday problem solving. When a calculation affects a contract, tax filing, medical decision or other high-stakes situation, verify the result with the appropriate professional or authoritative source.

Understand what the payment estimate includes

Calculate the principal-and-interest payment on a $275,000 loan with a fixed 6.25% annual rate and 30-year term. Then shorten the term to compare how monthly payments and total interest change.

What to check: The core result is principal and interest, not total housing cost. Property taxes, homeowners insurance, PMI, HOA charges, points, and maintenance must be considered separately.

Compare with the Amortization Schedule calculator when that better matches the question you are trying to answer.

Next mortgage calculations

To see how extra principal may shorten the loan, use the Mortgage Payoff Calculator. For the month-by-month principal and interest breakdown, use the Amortization Schedule Calculator. If you are still deciding on a purchase price, try the Home Affordability Calculator.

Frequently asked questions

What does the Mortgage Calculator calculate?

Estimate a fixed-rate mortgage payment, total interest and total of payments from the loan amount, interest rate and term.

How does the calculation work?

Monthly payment = P × r(1+r)^n ÷ ((1+r)^n − 1), where r is the monthly interest rate and n is the number of monthly payments.

Is this calculator free?

Yes. ERICH Calculators is free to use and no account is required.

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Method, assumptions & corrections

See how formulas, sources and limitations are handled across ERICH Calculators.