Compound Interest Calculator

Compound Interest Calculator works out how savings or a loan grow when interest is added to the balance. Choose what you want to find, enter the other numbers, and the result shows up in a drawer.

What you can find
• A: the final amount, from principal, rate, time and compounding
• P: the principal needed to reach a total amount (P+I), or to earn a total interest (I)
• R: the annual rate needed to grow a principal to a target amount
• T: the time needed to reach a target amount

What you get
• Principal, annual rate in percent and time in years
• Compounding from continuously to annually: daily (365 or 360 days), weekly, bi-weekly, semi-monthly, monthly, bi-monthly, quarterly and semi-annually
• Results shown with the rate and time in the same units as the inputs

Where it helps
• Seeing how a deposit grows in a savings account or a certificate of deposit
• Comparing how often interest is added, from daily to annually
• Working out the rate needed to reach a savings goal
• Checking how many years a balance needs to double or reach a target

Made for daily use
• Light and dark theme
• 28 languages, with right-to-left layout where it belongs

A new app
Built on the Calculator.io calculator engine. A More calculators link opens the full Calculator.io app, with 170+ tools for math, money, health and dates.

The app is supported by banner ads. Results are estimates for general information. Real accounts may use other rules, fees or taxes.