Interest Calculator
Estimate simple or compound interest on a lump-sum balance.
Inputs
Result
Future value
$16,470.09
Interest earned: $6,470.09
Visual breakdown
Principal10,000(61%)
Interest earned6,470.1(39%)
Formula
Simple: A = P(1 + rt). Compound: A = P(1 + r/n)^(nt). All rates as decimals; t in years.
Example
$10,000 at 5% for 10y, monthly compounding ≈ $16,470.
Frequently asked
Simple vs compound?
Simple interest accrues only on the principal. Compound interest also earns interest on prior interest.
What does APY vs APR mean here?
We use a nominal annual rate compounded n times per year. APY is what you actually earn after compounding.
Are taxes included?
No — this is a pre-tax estimate. Your real return will depend on local taxes.
Related calculators
Estimates only — not financial advice. Real returns vary with fees, taxes and rate changes.