Loan Calculator

Calculate monthly repayments and total interest for any loan. Full amortisation schedule shows principal vs interest breakdown per payment.

Open Loan Calculator → free, no sign-in
open full screen ↗

Working out what a loan will actually cost you — not just the monthly payment, but the total interest over the full term — is important before signing anything. The Loan Calculator gives you the full picture: monthly repayment, total interest paid, total cost, and a complete amortisation schedule showing how much goes to principal vs interest each month.

Anyone considering a mortgage, personal loan, car finance, or any other structured repayment — understanding the true cost before committing, not just the monthly number the lender leads with.

01 Open the Loan Calculator on Doathingy.com
02 Enter the loan principal, annual interest rate, and term in years
03 Monthly payment and total interest appear immediately
04 Scroll through the amortisation schedule

No tutorials. No learning curve. Open it and get started.

No server uploads. Full amortisation schedule included — so you can see the balance reduction over time, not just the monthly payment.

Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.

One job, done well. Loan Calculator was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.

What is an amortisation schedule?

A table showing how each payment divides between principal (reducing the balance) and interest, over the full loan term.

Why does most of the early payment go to interest?

Interest is calculated on the outstanding balance. Early on it's high; as the balance reduces, more goes to principal.

Does this account for extra payments?

This calculates standard repayment schedules — for overpayment scenarios, adjust the principal and term manually.

Can I compare different loan options?

Open the tool in multiple tabs with different inputs.

Is this accurate for UK mortgages?

It uses standard annuity loan mathematics — consult your lender for products with specific fees or structures.

Free. Instant. No sign-in. Open it and get the job done.

Open Loan Calculator on Doathingy.com →
Browse all free tools →