1RM Percentage Chart
Turn a reference max into percentage loads, or use an NSCA repetition reference to explore the relationship. Keep the difference between a calculated load and your actual repetition capacity clear.
Turn a percentage into a load
With a reference maximum of 125 kg, an 80% calculation is 125 × 0.80 = 100 kg. If your plan names 75%, the same calculation gives 93.75 kg. The tool displays that as 93.8 kg.
Changing the selected repetition reference changes the percentage to the corresponding NSCA value. Typing a different percentage selects “Custom percentage” when it has no exact match in that reference table.
What the repetition labels mean
The NSCA training-load chart associates 8 RM with 80% and 10 RM with 75%, among other reference points. RM means repetition maximum in that chart. It does not mean that everyone will complete exactly eight repetitions with every load calculated at 80%. [1]
The rows above use those numerical reference pairs, with an original layout and loads calculated from your input. The source chart's illustration and large precomputed load table are not reproduced here.
How to use the relationship in reverse
If a challenging eight-repetition set is treated as the chart's 80% reference, a 100 kg load would imply 100 ÷ 0.80 = 125 kg as a rough reference maximum. That is a chart-based estimate, not a completed 125 kg lift. For a comparison of multiple prediction equations, use the 1RM calculator.
A chart is a starting point for a conversation
Research on strength-endurance profiles shows that the relationship between relative load and repetitions can differ between people and exercises. A study involving 24 resistance-trained adults tested the bench press at 70%, 80% and 90% of 1RM; its findings do not turn one table into a universal prescription for all lifts. [2]
Keep the exercise, range of motion and effort in context when reading a percentage. The number also depends on the reference maximum you enter. An estimate from a different lift or setup does not automatically transfer to the movement you are about to do.
The displayed result is rounded to one decimal place for reading. Actual equipment may require a different load. Check what the bar and plates are marked with; this chart does not choose plates or tell you to round upward.
Percentage-chart questions
How many reps can I do at 80%?
The NSCA chart uses an 8 RM reference at 80%, but your repetition capacity can differ. Treat the reference as context, and follow an appropriate training plan rather than forcing a repetition target because it appears in a table.
What if my plan uses 82%?
Enter 82 in the percentage field. The tool calculates the load and shows “Custom percentage” because 82% is not one of the listed NSCA reference pairs.
Does the chart prescribe a strength program?
No. It calculates relative loads. Exercise selection, sets, effort, recovery and progression need their own context.
Sources
- NSCA Training Load Chart — the numerical RM-to-percentage reference pairs.
- Mitter et al. (2022): Reproducibility of strength performance and strength-endurance profiles — individual variation and test-retest context.
- NIST Guide to the SI, footnote 22 — exact mass-unit factor.