Practical Calculators

Compound Interest Calculator

Result: -

How this calculation works

What each input means

  • Principal (P) — Starting lump sum.
  • Rate % (r) — Annual interest rate entered as a percent.
  • Years (t) — Whole years the balance grows.

Formula used

Interest compounds once per year at the rate you enter:

A = P × (1 + r/100)t

Does not model contributions, withdrawals, or intra-year compounding.

How this result is estimated

This calculator provides estimate-level outputs based on the values you enter. Review assumptions and verify important decisions independently.

  • Inputs are user-provided and may include rounding.
  • Results are informational and not financial, tax, legal, or medical advice.
  • For high-impact decisions, confirm with a licensed professional.

Last reviewed: 2026-04-17

Frequently asked questions

Is this calculator result exact?

It is an estimate based on your inputs and may differ from official or provider-specific calculations.

Can I rely on this for final financial decisions?

Use it for planning and verify important numbers with official sources or licensed professionals.

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