How does the Brzycki formula calculate 1RM?

1RM = weight ÷ (1.0278 − 0.0278 × reps). For 80kg lifted 8 times: 1RM = 80 ÷ (1.0278 − 0.2224) = 80 ÷ 0.8054 = 99.3kg.

When should I use the Brzycki vs Epley formula?

Both are reliable for 2–10 rep ranges. Brzycki tends to give slightly more conservative estimates, which can be safer for planning near-max training percentages.

1RM Calculator — Brzycki Formula

Estimate your one-rep max using the Brzycki formula: weight ÷ (1.0278 − 0.0278 × reps). Especially accurate for moderate rep ranges of 2–10 reps.

1RM Brzycki

Estimate your one-rep max using the Brzycki formula: weight ÷ (1.0278 − 0.0278 × reps). Especially accurate for moderate rep ranges of 2–10 reps.

Value 1

Value 2

Value 3

Enter values above and press Calculate to see the result.

How It Works

Estimate your one-rep max using the Brzycki formula: weight ÷ (1.0278 − 0.0278 × reps). Especially accurate for moderate rep ranges of 2–10 reps

Each component has a specific meaning:

Brzycki formula: weight ÷ (1 — The brzycki formula: weight ÷ (1 recorded for the scenario being assessed.

Note: Interpret the 1rm brzycki result against the thresholds and context described above.

How to Use

Enter the Brzycki formula: weight ÷ (1 for the scenario you are assessing. Estimate your one-rep max using the Brzycki formula: weight ÷ (1.0278 − 0.0278 × reps). Especially accurate for moderate rep ranges of 2–10 reps. Use the 1rm brzycki result to inform your calculation.