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Sit-Up Test Norm Calculator

See how your one-minute sit-up count ranks against adult norms.

How it is calculated

The tool assumes the number of sit-ups adults complete in one minute follows a bell curve with a mean of 30 and a standard deviation of 10. It converts your count to a z-score, z = (sit-ups − 30) / 10, and reads the percentile from the normal distribution (using an approximation of the error function). The input is the whole number of full sit-ups in 60 seconds, and the output is a percentile with two decimals. Zero gives about 0.13%, a count of 30 gives exactly 50%, and negative counts return no result. One norm is used for everyone, with no age or sex adjustment, so treat the percentile as a rough ranking against a single adult average.

Worked example

You complete 40 full sit-ups in one minute. z = (40 − 30) / 10 = 1.0. A z-score of 1 sits one standard deviation above the average. Result: 84.13%, meaning 40 sit-ups beats roughly 84% of the assumed reference group. For comparison, 30 sit-ups gives 50.00% and 20 gives 15.87%.

Try this example →

Common mistakes

  • Counting repetitions from a test that ran longer or shorter than 60 seconds. The norm is for exactly one minute, so a 2-minute count has to be halved or retested.
  • Counting partial sit-ups where the shoulders do not reach the knees or the back does not touch the floor. The reference count is for full reps, so partial reps inflate the percentile.
  • Entering several sets added together. The test is one continuous minute, not the sum of sets.
  • Comparing results from different styles, such as feet held by a partner versus free feet, or arms across the chest versus behind the head, as if they were the same test.
  • Reading the percentile as a score out of 100. 84.13% means you rank above about 84% of the reference group, not that you did 84% of some maximum.

About this calculator

The one-minute sit-up test counts how many full sit-ups you complete with correct form in 60 seconds, a standard field measure of abdominal muscular endurance used across fitness testing batteries for decades. Because it’s a timed, repeated-rep test rather than a hold, it captures a slightly different quality than a plank — endurance under repeated dynamic contraction rather than sustained isometric hold.

Military, law-enforcement and school fitness tests, and general fitness assessments, use the one-minute sit-up count because it needs no equipment and takes only a minute to administer, while published normative tables convert the raw count into a percentile against age- and sex-matched adults so an individual score can be judged against a meaningful benchmark rather than in isolation.

This calculator takes your one-minute sit-up count and returns your core-endurance percentile against a single adult norm (an average of 30 sit-ups with a standard deviation of 10). It does not adjust for age or sex, so for age- or sex-specific standards use the published tables.

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