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$10,000 invested for 15 years at 9%
Exact compound math for the given inputs.
$38,380.43
future value (monthly compounding, no deposits)
Principal$10,000.00
Interest earned$28,380.43
Growth multiple3.84×
Rule of 728.0 yrs to double
Frequently asked questions
How much will $10,000 be worth in 15 years at 9%?
With monthly compounding it grows to $38,380.43 — that is $28,380.43 of interest earned on $10,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $36,424.82 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 8.0 years at 9% (8.00 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.