Compound Interest Calculator
Watch savings grow over time. Enter the starting amount, annual interest rate, years and compounding frequency — the future value and interest earned appear instantly.
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How to Use the Compound Interest Calculator
- Enter the starting amount (principal).
- Enter the annual interest rate.
- Enter the number of years and compounding frequency.
- Read the future value and interest earned.
Common Savings Scenarios
- $10,000 at 5% for 10 years
- $1,000 at 7% for 30 years
- $50,000 at 4% for 5 years (monthly)
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Frequently Asked Questions
What is compound interest?
Interest calculated on both the original amount and previously earned interest — so growth accelerates over time, unlike simple interest which applies only to the principal.
How often should interest compound?
More frequent compounding grows slightly faster. Savings accounts often compound daily or monthly; this calculator lets you compare frequencies.
What is the rule of 72?
A shortcut: divide 72 by the annual rate to estimate years needed to double your money. At 6%, money doubles in about 12 years.
Does this include taxes or inflation?
No. The result is the nominal future value before taxes, fees and inflation — real purchasing power will be lower.