Compound Interest Calculator
Estimate how a principal grows with compound interest over time. Supports yearly, monthly, and daily compounding.
Inputs
Future value (USD)
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Frequently asked questions
- What is the compound interest formula?
- A = P × (1 + r/n)^(n×t). P is principal, r is annual rate as a decimal, n is compounds per year, t is years.
- Does compounding frequency matter?
- Yes. Monthly (n=12) or daily (n=365) grows slightly faster than yearly (n=1) at the same nominal rate.
- How is interest earned shown?
- Interest earned = future value A − principal P. The primary result is A.
- Is this the same as simple interest?
- No. Simple interest is I = P×r×t with no compounding. Use the simple-interest calculator for that case.