Compound Interest Calculator
Grow savings projections with annual, quarterly, or monthly compounding.
Browser onlyYour data never leaves this device.
Runs entirely in your browser. Your numbers never leave this device and are never stored.
Details: Privacy policy
Inputs
Starting amount, before any interest.
Percent per year.
Whole years — the tool rejects fractions.
Fixed rate, no deposits or withdrawals. Estimates only — not financial advice.
Result
No inputs yet.
Enter principal, rate, and years above.
Compound Interest Calculator projects how a single sum grows over a chosen term under annual, quarterly or monthly compounding at a fixed rate you supply. It answers the classic question of what happens when interest starts earning interest, and why the same headline rate produces different totals depending on how often it compounds. Savers comparing accounts, teachers demonstrating exponential growth, and anyone sketching a long-range goal can enter a principal, a rate and a duration, then read the future value beside the interest earned. The model assumes no further deposits, withdrawals or fees, and rounds half-up to cents for display, so it stays an educational projection rather than a forecast. Every figure is computed locally, keeping your numbers on your own device. Because only one opening balance is compounded, recurring contributions belong in a separate calculation; treat the result as a ceiling for a single deposit rather than a full savings plan. Rounding to cents keeps the displayed total reproducible when you repeat the same run.
Key facts
- Input
- Principal, rate, term, compounding frequency
- Output
- Future value and interest earned
- Processing
- In your browser — nothing is uploaded
- Sign-up
- Not required
- Cost
- Free
Limits above are read from the same code that enforces them; formats are the ones the tool accepts and produces.
How to use Compound Interest Calculator
- Enter principal, rate, years, and frequency.
- Read the projected total with interest earned.
- Copy the summary or clear to start over.
What you get
- The projected future value together with the total interest earned.
- Figures for annual, quarterly or monthly compounding at your chosen rate.
- A copyable summary rounded half-up to cents.
When to use Compound Interest Calculator
- Compare compounding frequencies on the same savings goal.
- Show beginners how time multiplies steady savings.
- Sanity-check a quoted annual return across a multi-year horizon.
Frequently asked questions about Compound Interest Calculator
Does Compound Interest Calculator upload my numbers?
No. All arithmetic runs locally in your browser; nothing is sent, stored, or logged.
Which compounding frequencies exist?
Annual, quarterly, and monthly. More frequent compounding grows slightly faster at the same rate.
Are deposits or withdrawals included?
No. The projection compounds the starting principal only, with no additions or removals.
Is this financial advice?
No. These are educational projections at a fixed fictional rate. Real returns vary — talk to a professional.
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