Interest Calculator

$10,000
$100$500K$1M
5% p.a.
0.1%15%30%
5 years

Future Value

$12,833.59

after 5 years at 5% p.a.

Principal

$10,000.00

initial amount

Total Interest

$2,833.59

28.3% of principal

Nominal Rate

5% p.a.

stated rate

Effective Rate

5.1162%

true annual yield

Breakdown

Principal77.9%
Interest22.1%
YearInterest EarnedTotal InterestBalance
1$511.62$511.62$10,511.62
2$537.79$1,049.41$11,049.41
3$565.31$1,614.72$11,614.72
4$594.23$2,208.95$12,208.95
5$624.63$2,833.59$12,833.59

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Calculate exactly how much interest any sum of money will earn or cost over any time period using simple or compound interest formulas. Simple interest calculates returns only on the original principal; compound interest calculates on both principal and accumulated interest for exponential growth. Enter your principal, annual interest rate, and time period. For compound interest choose your compounding frequency: daily, monthly, quarterly, semi-annual, or annual. The tool instantly shows future value, total interest earned or paid, and the effective annual rate. A year-by-year growth table tracks your balance per period. A scenario comparison shows results at four interest rates simultaneously. A donut chart visualizes principal versus interest. Supports 130+ currencies. No account required.

How to Use

  1. 1Choose Simple Interest or Compound Interest using the toggle at the top
  2. 2Apply a preset (Savings, Investment, Bond, FD/CD) or enter your own principal amount
  3. 3Set the annual interest rate and time period (years, months, or days)
  4. 4For compound interest, select how often interest compounds (daily, monthly, quarterly, etc.)
  5. 5Review the Future Value, Total Interest, and Effective Rate - then explore the Year-by-Year table and Scenarios tab

Features

  • Simple and Compound interest modes
  • 4 quick presets (Savings, Investment, Bond, FD/CD)
  • Time period in years, months, or days
  • 5 compounding frequencies (daily, monthly, quarterly, semi-annual, annual)
  • Effective Annual Rate (EAR) calculation
  • Year-by-year balance and interest growth table
  • 4-scenario rate comparison table
  • Principal vs interest donut chart
  • 130+ currencies supported
  • Copy summary to clipboard

Frequently Asked Questions

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5 MB max fileNo batch
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