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$1,000 invested for 15 years at 4%
Exact compound math for the given inputs.
$1,820.30
future value (monthly compounding, no deposits)
Principal$1,000.00
Interest earned$820.30
Growth multiple1.82×
Rule of 7218.0 yrs to double
Frequently asked questions
How much will $1,000 be worth in 15 years at 4%?
With monthly compounding it grows to $1,820.30 — that is $820.30 of interest earned on $1,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $1,800.94 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 18.0 years at 4% (18.00 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.