See how savings or investments grow with compound interest and regular contributions. Enter the details below.
Future Value
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Balance at the end.Usage Tip
The Rule of 72: divide 72 by the rate to estimate years to double. At 8%, money doubles in about 9 years.
THE MATH
A = P(1 + r/n)^(nt)
plus contributions compounded each period
r = annual rate, n = times compounded per year, t = years
plus contributions compounded each period
r = annual rate, n = times compounded per year, t = years
Compound interest pays interest on both the principal and previously earned interest, so a balance grows faster the longer it sits.
More frequent compounding (monthly versus annually) helps slightly; the rate and time matter far more.
More frequent compounding (monthly versus annually) helps slightly; the rate and time matter far more.
The earlier you start, the more time compounding has to work — time in the market usually beats timing it.
Real returns vary year to year; this assumes a steady rate, so treat it as a smooth estimate.
Inflation reduces what the future balance can buy; a separate inflation calculation shows the value in today dollars.
Real returns vary year to year; this assumes a steady rate, so treat it as a smooth estimate.
Inflation reduces what the future balance can buy; a separate inflation calculation shows the value in today dollars.