Interest Calculator
Estimate simple or compound interest on a lump-sum balance.
Inputs
Result
Future value
$16,470.09
Interest earned: $6,470.09
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Visual breakdown
Principal $10,000.00 — 61%
Interest earned $6,470.09 — 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.
Related: Savings · Loan payment · Mortgage
Common examples
$10,000 @ 5%, 10y
Compounded annually ≈ $16,289.
Simple 4% on $5,000, 3y
= $600 interest.
$1,000 monthly contribution
Compounded growth over years.
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.
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More money & work →Estimates only — not financial advice. Real returns vary with fees, taxes and rate changes.