How to calculate percent of year complete in Excel

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If you need to calculate the percent remaining in a year, based on a given date, you do so with a formula based on the YEARFRAC function.

Formula

=YEARFRAC(DATE(YEAR(date),1,1),date)

Explanation

In the example, the formula in C5, which calculates percentage of year remaining, is:

=YEARFRAC(DATE(YEAR(B5),1,1),B5)

How the formula works

the YEARFRAC function takes two dates, a start date and and an end date, and calculates the time between them in fractional years. In this case, we are using the end date as-is, but generating a start date that equals the first day of the same year with this bit of code:

DATE(YEAR(B5),1,1)

This extracts the year value from the date in B5 and plugs it into the DATE function, along with a 1 for both month and day.

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The result is that the YEARFRAC function returns a decimal value that corresponds to the fraction of the year between the two dates.

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When this value is formatted with the percentage number format, it shows percent of year complete.

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Percent of year remaining

To calculate percent of year remaining, just adjust the formula to subtract the fractional year from 1. In the example, D5 contains this formula:

=1-YEARFRAC(DATE(YEAR(B5),1,1),B5)

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