Summary

To calculate the cumulative principal paid between any two loan payments, you can use the CUMPRINC 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:

=CUMPRINC(C6/12,C8,C5,1,60,0)

Generic formula

=CUMPRINC(rate,nper,pv,start,end,type)

Explanation 

For this example, we want to calculate cumulative principal payments 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 CUMPRINC like this:

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

=C6/12

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 CUMPRINC function returns 5,000, which matches the original loan value as expected.

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CUMPRINC Function

The Excel CUMPRINC function is a financial function that returns the cumulative principal paid on a loan between a start period and an end period. You can use CUMPRINC to calculate and verify the total principal paid on a loan, or the principal paid between any two payment periods.
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Dave Bruns

Hi - I'm Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.

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