Skip to content
Tools Free calculators that show their working

Money Calculators

Free money calculators for mortgages, loans, savings and take-home pay. Every result shows the formula behind it, uses figures you can check against official sources, and runs privately in your browser.

Start with a repayment, then follow the “next step” links to see what the same numbers mean for your budget, your savings or your payslip.

Compound Interest Calculator

A compound interest calculator shows how money grows when interest earns interest. $10,000 at 5% compounded monthly becomes…

Loan Calculator

A loan calculator shows the fixed monthly payment on an amortizing loan and how much interest you pay…

Mortgage Calculator

A mortgage calculator estimates your monthly repayment from the property price, your deposit, the interest rate and the…

UK Take-Home Pay Calculator

A take home pay calculator shows what lands in your bank after income tax, National Insurance, pension and…

US Paycheck Calculator

A paycheck calculator estimates take-home pay after federal income tax, Social Security, Medicare and pre-tax deductions. On a…