Compound Interest Calculator
See how savings and investments grow
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About this calculator
Compound interest earns interest on both your original deposit and the interest already added. Set a starting amount, an annual rate, how often it compounds and an optional monthly deposit to see the future value.
The formula
A = P(1 + r/n)^(nt) (monthly deposits are added at the end of each month)
Worked example1,000 at 5% for 10 years, compounded monthly → about 1,647.01.
Frequently asked questions
How often should interest compound?
More frequent compounding grows slightly faster. Monthly and daily are common for savings accounts.
Are returns guaranteed?
No. Investment returns vary. This is a projection using a constant rate.
Is inflation included?
No. Results are in nominal terms; real purchasing power will be lower.
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