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$1,000 invested for 15 years at 9%
Exact compound math for the given inputs.
$3,838.04
future value (monthly compounding, no deposits)
Principal$1,000.00
Interest earned$2,838.04
Growth multiple3.84×
Rule of 728.0 yrs to double
Frequently asked questions
How much will $1,000 be worth in 15 years at 9%?
With monthly compounding it grows to $3,838.04 — that is $2,838.04 of interest earned on $1,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $3,642.48 — 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.