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$100,000 invested for 15 years at 10%
Exact compound math for the given inputs.
$445,391.96
future value (monthly compounding, no deposits)
Principal$100,000.00
Interest earned$345,391.96
Growth multiple4.45×
Rule of 727.2 yrs to double
Frequently asked questions
How much will $100,000 be worth in 15 years at 10%?
With monthly compounding it grows to $445,391.96 — that is $345,391.96 of interest earned on $100,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $417,724.82 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 7.2 years at 10% (7.20 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.