Compound Interest Calculator
See how money grows with yearly, half-yearly, quarterly or monthly compounding.
Year-by-year table
The formula
A = P × (1 + r/k)k×t, where r is the annual rate as a decimal, k the number of compounding periods a year and t the years. More frequent compounding earns slightly more.
The rule of 72
Divide 72 by the interest rate to estimate how many years money takes to double: about 9 years at 8%, 6 years at 12%. It is a quick check on any investment promise.
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This is an estimate for planning only, not financial, tax or medical advice.