One Rep Max Calculator
Pick a lift, enter weight and reps, then get your estimated 1RM, training loads, and a simple progression tip.
Enter your lift
Use a recent clean set. The estimate is best from 2-10 reps.
Your results
Enter your lift and click calculate. Your estimated 1RM, training percentages, and progression targets will appear here.
How progressive overload should look
Progressive overload does not mean adding weight every workout forever. It means gradually increasing training stress while still recovering and keeping technique consistent.
Keep the same weight and build from the low end to the high end of a rep range before increasing load.
When reps are solid, add a small amount of weight and let reps drop back down.
Good progress often looks like repeated small jumps, plateaus, and resets, not nonstop weekly PRs.
1RM and progression questions
Can I use this as a bench press, squat, or deadlift 1RM calculator?
Yes. The same basic 1RM formula can estimate different lifts. The exercise dropdown changes the result wording and coaching notes, but the calculator stays simple.
How should I use the progression targets?
Treat them as milestones, not promises. If your estimated 1RM is 225 lb, a 5% milestone is about 236 lb. Your timeline depends on training age, sleep, nutrition, recovery, exercise technique, and programming.
What should I change when progress stalls?
First check technique, recovery, and consistency. Then adjust one variable at a time: reps, load, sets, rest, tempo, or frequency. More is not always better if recovery cannot keep up.
Want a weekly training structure?
Use the workout split builder to organize training days by goal, experience level, and equipment.