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Compound Interest Calculator

See how a starting balance grows over time with compound interest and optional monthly contributions, including a year-by-year breakdown.

Best for:Planning long-term savingsComparing compounding frequenciesEstimating investment growth
Privacy-first processingProjections run entirely in your browser. Your numbers never leave your device.
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Guide

Usage, privacy, and related tools

Best for

  • Planning long-term savings
  • Comparing compounding frequencies
  • Estimating investment growth

Privacy

Projections run entirely in your browser. Your numbers never leave your device.

Quick tips

  • More frequent compounding (monthly vs annually) increases the final balance slightly.
  • Regular contributions usually have a bigger impact on long-term growth than the starting amount.

How to use this tool

  1. Enter your starting amount and currency.
  2. Set the annual rate, number of years, and compounding frequency.
  3. Add an optional monthly contribution to see how it changes the outcome.

Common questions

What does compounding frequency change?

It sets how often interest is added back to the balance. The more often it compounds, the more interest you earn on previously earned interest.

Are contributions added before or after interest?

Each period the balance earns interest first, then the contribution for that period is added.

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