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$1,000 invested for 15 years at 7%
Exact compound math for the given inputs.
$2,848.95
future value (monthly compounding, no deposits)
Principal$1,000.00
Interest earned$1,848.95
Growth multiple2.85×
Rule of 7210.3 yrs to double
Frequently asked questions
How much will $1,000 be worth in 15 years at 7%?
With monthly compounding it grows to $2,848.95 — that is $1,848.95 of interest earned on $1,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $2,759.03 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 10.3 years at 7% (10.29 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.