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$1,000 invested for 30 years at 1%
Exact compound math for the given inputs.
$1,349.69
future value (monthly compounding, no deposits)
Principal$1,000.00
Interest earned$349.69
Growth multiple1.35×
Rule of 7272.0 yrs to double
Frequently asked questions
How much will $1,000 be worth in 30 years at 1%?
With monthly compounding it grows to $1,349.69 — that is $349.69 of interest earned on $1,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $1,347.85 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 72.0 years at 1% (72.00 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.