Strength & Gym Calculators

Strength training rewards patience, and patience is much easier when you can see progress you'd otherwise miss. Adding a rep at the same weight, or the same reps at a slightly better bodyweight ratio, is real progress even when the number on the bar hasn't moved. The tools here exist to make those changes visible.

Estimated one-rep max is the most useful of them. Rather than testing a true maximum — which is fatiguing, needs spotters, and carries some risk — you can estimate it from a set you've already done using established formulas like Epley and Brzycki. That estimate then drives your working percentages for a training programme.

Using These Tools Well

Estimates get less accurate at high reps. A set of three predicts your max well. A set of fifteen is testing endurance as much as strength, and the prediction drifts.
Compare like with like. Bodyweight-adjusted scores such as Wilks exist because a 60 kg lifter and a 110 kg lifter aren't comparable on absolute load alone.
Technique quality counts. A rep with a bounce and a shortened range isn't the same rep. Consistent standards are what make your own numbers comparable over time.
Progress isn't linear forever. Early gains come quickly, then slow. A plateau after months of training is normal, not a failure.