Finance
Free tools for your personal finances: calculate your mortgage payment, compound or simple interest, return on investment (ROI), the rule of 72 and currency conversion.
Compound interest calculator
Calculate how much your investment will grow with regular contributions and an annual interest rate.
Mortgage calculator
Calculate your monthly mortgage payment, the principal-interest split and the total cost of the loan, with an amortization chart.
ROI calculator
Calculate return on investment (ROI) from the initial investment and the profit obtained.
Currency Converter
Convert an amount between currencies using the exchange rate you enter.
Simple Interest Calculator
Calculate the interest earned and the total amount with simple interest.
Rule of 72 Calculator
Calculate how many years it takes to double an investment based on its annual interest rate.
Which calculator to use for your goal
Saving and investing
The Compound interest calculator shows how much a sum grows when interest is reinvested, with or without regular contributions. Simple interest is calculated only on the initial amount. The Rule of 72 gives a quick estimate of how many years it takes an investment to double, and the ROI calculator compares the return on two investments.
Financing a purchase
The Mortgage calculator shows the monthly payment, the split between principal and interest, the total cost of the loan and how much you save with extra payments. Changing the term or the interest rate lets you see the effect before you talk to your bank.
Currencies and limits
The Currency converter uses the exchange rate you enter, so check the current rate with your bank or card provider first. All results are estimates and are no substitute for professional advice.