DocomintCompound Interest Calculator
Calculate the future value of an investment with interest compounding daily to annually.
Compound interest earns interest on top of previously earned interest, not just the original principal — the more frequently it compounds (daily vs. annually), the faster it grows, since each compounding period's gains start earning their own interest sooner.
Example: $10,000 at 6% annual interest compounded monthly for 10 years grows to about $18,194 — compare that to the same principal and rate under Simple Interest Calculator, which only reaches $16,000, to see exactly how much compounding itself contributes.
How it works
- Enter the principal, annual interest rate, compounding frequency, and years
- Press Calculate
- The future value and total interest earned appear instantly, computed on your device
Frequently asked questions
How does compounding frequency affect growth?
More frequent compounding (daily vs. monthly vs. annually) means interest starts earning its own interest sooner, so the same nominal annual rate produces slightly more growth the more often it compounds — though the difference between, say, monthly and daily compounding is usually small in practice.
What's the difference between compound and simple interest?
Simple interest is calculated only on the original principal every period. Compound interest is calculated on the principal plus all interest already earned, so growth accelerates over time rather than staying linear.
Is my numbers uploaded anywhere?
No — Compound Interest Calculator runs entirely in your browser using JavaScript/WebAssembly. Your numbers is never sent to a server.