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$100,000 invested for 15 years at 8%
Exact compound math for the given inputs.
$330,692.15
future value (monthly compounding, no deposits)
Principal$100,000.00
Interest earned$230,692.15
Growth multiple3.31×
Rule of 729.0 yrs to double
Frequently asked questions
How much will $100,000 be worth in 15 years at 8%?
With monthly compounding it grows to $330,692.15 — that is $230,692.15 of interest earned on $100,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $317,216.91 — 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.