Compare multiple rep-max formulas.
This calculator estimates max strength from a recent set and shows the spread across several common rep-max formulas.
Strength Training
Rep Max Calculator
Use this rep max calculator to compare several common max-estimation formulas instead of relying on only one method.
How it works
How to use the rep max calculator
Rep Max Calculator is intended for lifters who want a more conservative and balanced estimate than a single formula alone. Use it to compare multiple strength estimates when you want a broader view of your likely max.
Enter the weight and reps from a recent hard set and compare the projected maxes from each formula. The calculator returns a rep-max estimate range.
Different rep-max formulas can disagree, especially as reps climb or set quality becomes less controlled. Use the average and range to guide training decisions rather than anchoring to the highest estimate.
FAQ
Common questions about the Rep Max Calculator.
Use these quick answers as a starting point, then compare the result with your real-world progress.
What does the rep max calculator tell me?
Enter the weight and reps from a recent hard set and compare the projected maxes from each formula. The result is a rep-max estimate range.
How accurate is the rep max calculator?
Different rep-max formulas can disagree, especially as reps climb or set quality becomes less controlled.
What should I do after I get my result?
Use the average and range to guide training decisions rather than anchoring to the highest estimate.
Who is this calculator best for?
This calculator is intended for lifters who want a more conservative and balanced estimate than a single formula alone.
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