Everyday numbers, solved
Estimate future value, interest earned, and percentage growth from a starting principal, annual rate, frequency, and term.
Money
Estimate how a one-time principal grows over time.
Future value
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Estimate assumes a fixed rate and no withdrawals, taxes, or fees. Monthly contributions are added at the start of each month.
How it works
Quick answer: $10,000 at 6% compounded monthly grows to $18,194 in 10 years, earning $8,194 in interest without any extra deposits.
A = P(1 + r ÷ n)^(n × t)
With monthly deposits, each deposit compounds from the month it is added.P is the starting principal, r the annual rate, n the compounding periods per year, and t the years.
$10,000, 6% a year, compounded monthly, 10 years, no deposits. Future value: $18,194. Interest earned: $8,194 (81.9% total growth).
| Years | Future value | Interest earned | Open |
|---|---|---|---|
| 5 years | $13,489 | $3,489 | Open |
| 10 years | $18,194 | $8,194 | Open |
| 20 years | $33,102 | $23,102 | Open |
| 30 years | $60,226 | $50,226 | Open |
| 40 years | $109,575 | $99,575 | Open |
How often interest is added to the balance each year; more frequent compounding grows slightly faster.
It projects growth of the starting principal over the term at the given rate.
Divide 72 by the annual rate to estimate the years to double. At 6%, money doubles in about 12 years.