ToolWren › Loan

Loan & Mortgage Calculator

Work out the monthly payment on a loan or mortgage, plus the total interest and total amount repaid, from the loan amount, annual interest rate and term.

100% client-side · nothing is uploaded

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How to use the Loan

Enter the loan amount, annual interest rate and term in years.
Your monthly payment, total of payments and total interest calculate automatically.
Adjust any value to compare different loans or terms.
Treat the figures as estimates and confirm exact numbers with your lender.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Loan

How loan payments work

A fixed-rate loan is repaid in equal monthly instalments. Each payment covers interest on the remaining balance plus a slice of principal, calculated with the standard amortization formula.

What you'll see

Enter the amount, annual interest rate and term in years to get your monthly payment, the total of all payments, and how much of that is interest.

Use it for any loan

The same maths applies to mortgages, car loans, student loans and personal loans — anything with a fixed rate and term.

Frequently asked questions

How is the monthly payment calculated?

With the amortization formula: P·r·(1+r)ⁿ ÷ ((1+r)ⁿ−1), where r is the monthly rate and n the number of months.

Does it include taxes and insurance?

No — it calculates principal and interest only. Add escrow items separately for a full mortgage estimate.

Is it accurate?

It uses the standard formula lenders use, but treat results as estimates and confirm exact figures with your lender.