How do I calculate the interest rate I earned on a 401K account?

I have records of my contribution and balance at the end of each month. From this I can see the total amount of interest earned each month. How do I find the rate though?

Answers:
The easiest way is to ...

lmt=last month total
tmt=this month total
in=amount you added to the 401K

rate=(tmt-lmt-in)/lmt

this will get you the rate for the month, if you want an annual rate multiply the above by 12.

Keep track of this on a month to month basis and soon you can keep a rolling average of your gains.
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You should be getting a statement from the trustee telling you this information.

ask for it.
To express it on percentage, multiply by 100 what you got from SWH's equation.

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