One-Rep Max Calculator
Estimate 1RM from submaximal lifts using the Epley equation.
Use the calculator below, then review the formula, a numeric example, and the reference table to understand how the one-rep max estimator result is produced.
Calculator inputs
Result
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What is this calculator?
Estimate 1RM from submaximal lifts using the Epley equation. The formula, a worked example, and a reference table are below. Results are for education only, not medical advice.
How it works
Epley: estimated 1RM (kg) = weight lifted × (1 + reps ÷ 30), reps 1–12.
Example
80 kg × 5 reps → 80 × (1 + 5/30) ≈ 93.3 kg estimated 1RM.
Reference Table
| Value | Meaning |
|---|---|
| 1–5 | Strength-focused sets |
| 6–12 | Common for Epley estimates |
| >12 | Endurance–equations less accurate |
FAQ
True max test safety?
Use spotters and conservative progression.
Other formulas?
Brzycki and Lombardi differ slightly.
Different lifts?
Squat vs bench accuracy varies by training.
Beginners?
Technique gains can outpace formula predictions.