TetraKits
Compound Interest Calculator
Project how savings grow with compound interest. Enter principal, annual rate, years, and compounding frequency — see future value, total interest earned, and a year-by-year growth breakdown.
Read: Compound Interest Calculator Guide: Formula, Examples & Free Tool →
- 40+ Currencies
- Free to Use
- Instant Results
| Year | Contributed | Interest | Balance |
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How to calculate compound interest
- 1
Enter principal and rate
Type the starting amount and annual interest rate as a percentage. Example: $10,000 at 5% per year.
- 2
Set time and frequency
Enter years and choose compounding: annually, quarterly, monthly, or daily. More frequent compounding yields slightly higher returns.
- 3
Read future value
See ending balance and total interest. Compare with simple interest or plan loans with the loan calculator.
Why Use This Calculator?
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Free Forever
Run unlimited projections with no subscriptions or hidden fees.
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Multi-Currency
Switch between 40+ currencies with a beautiful floating selector.
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Live Updates
See your future balance update instantly as you adjust inputs.
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Privacy Friendly
All calculations run in your browser. Your numbers stay on your device.
Frequently Asked Questions
What is compound interest?
Compound interest earns interest on both principal and previously earned interest. Formula: A = P(1 + r/n)^(nt), where n is compounding periods per year.
How does compounding frequency affect returns?
More frequent compounding (daily vs annually) produces a higher effective yield on the same nominal rate, though the difference is modest at typical savings rates.
What is the difference between simple and compound interest?
Simple interest applies only to the original principal. Compound interest reinvests earned interest — growth accelerates over time.
Can I model regular contributions?
This calculator compounds a single principal. For monthly deposits, run separate scenarios or use a dedicated savings planner.
Is this compound interest calculator free?
Yes. Unlimited projections with no signup; all math runs in your browser.
Watch Savings Compound Over Time
Retirement planning, CD comparisons, and teaching financial literacy all hinge on compound growth — not linear simple interest. Enter principal, rate, and compounding frequency to see future value and total interest earned.
This calculator combines an initial deposit, monthly contributions, your expected annual return, and compounding frequency to show a clear projection with a year-by-year breakdown.
