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$5,000 invested for 15 years at 8%
Exact compound math for the given inputs.
$16,534.61
future value (monthly compounding, no deposits)
Principal$5,000.00
Interest earned$11,534.61
Growth multiple3.31×
Rule of 729.0 yrs to double
Frequently asked questions
How much will $5,000 be worth in 15 years at 8%?
With monthly compounding it grows to $16,534.61 — that is $11,534.61 of interest earned on $5,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $15,860.85 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 9.0 years at 8% (9.00 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.