Calculatorism

Bench Press One-Rep Max (1RM) Calculator

Enter your bench press weight and reps to estimate your one-rep max (1RM).

Input Data

Epley / Brzycki / Lander / Lombardi.
Weight
Reps

Results

Estimated one-rep max.
93.3
Explanatory note about the result.
Epley: 80kg × 5 次 → 1RM ≈ 93.3 kg。

At a glance:Estimate 1RM from a submaximal set. Epley: 1RM = weight × (1 + reps/30). Brzycki: 1RM = weight × 36/(37−reps). These are estimates — always test a true 1RM with a spotter. Complements squat-1rm and deadlift-1rm.

Formula

Epley: 1RM = weight × (1 + reps/30).

Brzycki: 1RM = weight × 36 / (37 − reps).

How to Use

  1. Pick a formula.
  2. Enter the weight you lifted and the reps completed.
  3. The tool returns the estimated 1RM.

Case Studies

100 kg × 5 reps (Epley)

1RM = 100 × (1 + 5/30) = 116.7 kg.

FAQ

How accurate is the estimate?

Within ~5%; accuracy drops for very high reps (use ≤10 reps for best estimates).

Related Tools

References

Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Bench Press One-Rep Max (1RM) Calculator（/sports/bench-1rm）。