Compound Interest Calculator
Calculate future value with compound interest. Example: $1000, 5% per year, 10 years → ~$1628. Copy result.
Compound interest grows the principal by rate each period: A = P(1 + r)^n. Enter principal, rate per period (%), and number of periods. The calculator gives the future value. Use annual rate and years, or adjust for monthly/quarterly compounding. Copy the result or Copy with labels.
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Examples
- $1000, 5% per year, 10 years → ~$1628.89
- €5000, 4% per year, 5 years → ~€6083.26
- $1000, 6% per year, 12 months (monthly compound) → ~$1061.68
FAQ
What is compound interest?
Interest is calculated on the principal plus previously earned interest. Future value = P × (1 + r)^n.
What is the formula?
A = P(1 + r)^n where P = principal, r = rate per period (decimal), n = number of periods.
What if interest compounds monthly?
Use rate per period (e.g. annual 6% → 0.06/12 per month) and number of periods (e.g. 10 years × 12 = 120 months).
How is this different from simple interest?
Compound: interest earns interest. Simple: interest only on the original principal.
What currency?
Enter principal in your currency. Result is in the same unit.