One-Rep Max Calculator
Estimates your one-rep maximum from a set taken close to failure using seven published formulas, then builds a percentage-of-1RM table so you can pick loads for any rep target.
Read the full guide to this tool
Results
Notes
- Epley: 1RM = w × (1 + reps/30). The formulas agree closely at low reps and spread out as reps rise.
- An estimate is not a licence to max out — build up to heavy singles gradually and use a spotter.
- This is an educational estimate, not medical advice; consult a professional for decisions about your health.
Related tools
Calories Burned Calculator
Energy burned by activity using MET values.
Running Pace Calculator
Pace ↔ speed ↔ race time, plus a race predictor.
Heart Rate Zone Calculator
Five training zones from age or measured max HR.
VO₂max Estimator
Aerobic fitness from a Cooper, heart-rate or run test.
Antibiotic Resistance Evolution Simulator
Watch bacteria evolve resistance — and see why finishing the course matters.
BMI Calculator
Body mass index, WHO category and healthy weight range.