For one year it should be easy. It's simply your annual return. Next year you can average the two like jpcavin did with here 5 years or compute an annualized return if you feel up to it. Either one should be more accurate than the approximation I came up with. That's for folks like me who don't have the records for their earlier years. I just wanted to show that your return is really greater than (balance - contributions) / contributions so don't have a heartattack.
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