Quick, clean, and to the point

Calculate cumulative loan interest

Excel formula: Calculate cumulative loan interest
Generic formula 

To calculate the cumulative principal paid between any two loan payments, you can use the CUMIPMT function. In the example shown, we calculate the total principal paid over the full term of the loan by using the first and last period. The formula in C10 is:


For this example, we want to calculate cumulative interest over the full term of a 5-year loan of $5,000 with an interest rate of 4.5%. To do this, we set up CUMIPMT like this:

rate - The interest rate per period. We divide the value in C6 by 12 since 4.5% represents annual interest:


nper - the total number of payment periods for the loan, 60, from cell C8.

pv - The present value, or total value of all payments now, 5000, from cell C5.

start_period - the first period of interest, 1 in this case, since we are calculating principal across the entire loan term.

end_period - the last period of interest, 60 in this case for the full loan term.

With these inputs, the CUMIPMT function returns -592.91, the total interest paid for the loan.

Dave Bruns

Excel Formula Training

Formulas are the key to getting things done in Excel. In this accelerated training, you'll learn how to use formulas to manipulate text, work with dates and times, lookup values with VLOOKUP and INDEX & MATCH, count and sum with criteria, dynamically rank values, and create dynamic ranges. You'll also learn how to troubleshoot, trace errors, and fix problems. Instant access. See details here.

Download 100+ Important Excel Functions

Get over 100 Excel Functions you should know in one handy PDF.