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Savings & investment calculators · free

Compound Interest Calculator

See how money grows when interest earns interest — yearly, half-yearly, quarterly or monthly compounding.

  • Instant results
  • No signup
  • Remembers your inputs
  • Rates checked Oct 2026

How the compound interest calculator works

A = P × (1 + r/n)n × t.

How to use it

  1. Move the sliders or type exact figures — results update as you go.
  2. Read the highlighted result first, then the breakdown and chart.
  3. Open the year-by-year table to plan ahead, or copy the result into your notes.

Frequently asked questions

What is the rule of 72?

Divide 72 by the annual rate to estimate how many years money takes to double. At 8%, that's about 9 years.

Results are estimates for planning, not financial, tax or investment advice. Rates and rules change — confirm with your bank, the scheme's official notice or a CA. Last reviewed 13 October 2026.

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