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Compound Interest Calculator

Principal, rate, years and contributions. Future value, chart and schedule update as you type. Compounding matches contribution frequency by default.

%
£
Contribution frequency
Future value —
Interest earned —
Contributions —

Growth chart

Annual schedule

Year Start Contributions Interest End Real end

100% Client-Side Processing

What Compound Interest Calculator is

Principal, annual rate, years, and contribution amount and frequency give a future value, interest earned, an SVG growth chart, and an annual schedule. Compounding matches how often you contribute. Contributions apply at the end of each period. It is compound-interest arithmetic in this browser, not a bank quote and not tax advice.

How to use it

  1. Choose a currency beside the principal, then enter principal, annual rate, and years.
  2. Add a contribution amount and frequency (weekly / monthly / annually). Compounding follows that frequency automatically.
  3. Read the future value, chart, and year-by-year schedule below.
  4. Read future value, the growth chart, and the year-by-year schedule. Copy the summary if you want that line in a note.

Common uses

Sense-check a savings goal or a classroom example. See how regular contributions change the path. Rounding still applies. A real account has fees, tax, and a rate that can change.

Privacy

Numbers and text stay in this tab. We do not log them. Refresh the page and the form resets. We never see what you copy. Chart and table are drawn locally with no chart libraries.