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$1,000 invested for 10 years at 8%
Exact compound math for the given inputs.
$2,219.64
future value (monthly compounding, no deposits)
Principal$1,000.00
Interest earned$1,219.64
Growth multiple2.22×
Rule of 729.0 yrs to double
Frequently asked questions
How much will $1,000 be worth in 10 years at 8%?
With monthly compounding it grows to $2,219.64 — that is $1,219.64 of interest earned on $1,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $2,158.92 — 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.