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How do you calculate person months?

Per NIH, “Conversion of percentage of effort to person months is straight-forward. To calculate person months, multiply the percentage of your effort associated with the project times the number of months of your appointment. For example:

• 25% of a 9 month academic year appointment equals 2.25 (AY) person months (9 x 0.25= 2.25)

• 10% of a 12 month calendar appointment equals 1.2 (CY) person months (12 x 0.10 = 1.2)

• 35% of a 3 month summer term appointment equals 1.05 (SM) person months (3 x 0.35= 1.05)

• 10% of a 0.5 FTE 12 month appointment equals 0.6 (CY) person months (12 x .5 X .1 = 0.6)

https://intranet.med.wisc.edu/research/proposals-and-agreements/effort-on-proposals/

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