Compound Interest Calculator
Calculate compound interest on a single principal. See how your money grows over time with different compounding frequencies. Figures never leave your device — every calculation runs locally in your browser.
How to Use the Compound Interest Calculator
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Frequently Asked Questions
What compounding frequencies are supported?
Annual, semi-annual, quarterly, monthly, and daily compounding. More frequent compounding produces slightly higher returns — the calculator shows the difference between each frequency.
Can I include regular contributions?
No — this tool compounds a single principal only, with no contribution input. For monthly saving plans, use the Savings Calculator instead.
What does the growth chart show?
A year-by-year table of value and interest with a progress bar per row — no hover chart. Each row shows that year's value, interest earned, and relative growth.
Can I compare different scenarios?
Yes. Adjust principal, rate, compounds per year, and years, then re-read — the delta between runs is the decision signal.
What does $1,000 at 5% become in 10 years?
Compounded yearly: 1,000 × 1.05^10 = $1,628.89. Monthly compounding lands a touch higher at $1,647.01 — type 1 or 12 in compounds-per-year to see both.
When using Compound Interest Calculator, is my financial data stored?
No. All calculations run locally in your browser. No investment data is transmitted.
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Last updated October 2026