Rex says
Same equations the textbooks use — just way less awkward. Pop in your stats and I'll tell you what the number actually means for you.
Try a scenario
Click to load — tweak from there.Inputs
Result
Estimated 1RM (avg)
212.0
Epley formula
215.8
Brzycki formula
208.1
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter weight lifted (lb/kg).
- 2Enter reps performed.
- 3Read your estimated 1rm (avg) on the right — it updates as you type.
- 4Hit Share to keep the scenario or send it to someone.
About this calculator
Uses the Epley and Brzycki formulas to estimate 1RM from a recent lift.