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$100,000 invested for 20 years at 9%
Exact compound math for the given inputs.
$600,915.15
future value (monthly compounding, no deposits)
Principal$100,000.00
Interest earned$500,915.15
Growth multiple6.01×
Rule of 728.0 yrs to double
Frequently asked questions
How much will $100,000 be worth in 20 years at 9%?
With monthly compounding it grows to $600,915.15 — that is $500,915.15 of interest earned on $100,000.00.
What if compounding is annual instead of monthly?
Annual compounding gives $560,441.08 — more frequent compounding always yields slightly more.
How long until it doubles?
The Rule of 72 estimates 8.0 years at 9% (8.00 precisely).
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Change the numbers yourself
Open the interactive compound interest calculator — every field is editable.