Calculator inputs
Estimate one-rep max strength from weight and reps.
Enter the weight using the unit shown in the label.
Number of completed repetitions at the entered weight.
Controls rounding in the displayed result only; it does not change the underlying calculation.
How this calculator works
This calculator estimates maximum strength from a submaximal set.
Use this result as a planning estimate. Real lending, payroll, tax, health or construction outcomes can vary based on official rules, local costs and personal circumstances.
Formula
Worked example
100 kg for 5 reps estimates a one-rep max of about 116.7 kg.
Frequently asked questions
Why use this calculator?
It gives a fast estimate and helps compare related scenarios before moving to more detailed planning.
Is the result exact?
No. Treat it as a practical estimate and verify important numbers with official sources or qualified professionals.