A One Rep Max (1RM) is determined by lifting a weight for several repetitions and using a strength prediction formula to estimate the maximum weight you can lift once. A common method is the Epley formula: 1RM = Weight × (1 + Reps ÷ 30), which allows safe strength estimation without maximal lifting.
Simple Steps to Determine Your 1RM
- Lift a manageable weight with proper form.
- Perform as many repetitions as possible (ideally 3–8 reps).
- Record the weight and repetitions completed.
- Apply a 1RM formula such as Epley or Brzycki.
- Use the result to guide training intensity.
Why Estimate Instead of Testing 1RM?
Estimating your 1RM reduces injury risk while still providing an accurate measurement of strength for workout programming and progress tracking.