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$10,000 invested for 20 years at 7%
Exact compound math for the given inputs.
$40,387.39
future value (monthly compounding, no deposits)
Principal$10,000.00
Interest earned$30,387.39
Growth multiple4.04×
Rule of 7210.3 yrs to double
Frequently asked questions
How much will $10,000 be worth in 20 years at 7%?
With monthly compounding it grows to $40,387.39 — that is $30,387.39 of interest earned on $10,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $38,696.84 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 10.3 years at 7% (10.29 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.