One Rep Max Calculator
Estimate the heaviest weight you could lift once from a lighter set, using two common formulas. Enter weight lifted and repetitions to see epley…
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Estimate the heaviest weight you could lift once from a lighter set, using two common formulas. Enter weight lifted and repetitions to see epley estimate and brzycki estimate when you calculate.
For general information only, not medical advice. Consult a qualified health professional before making health decisions.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (weight lifted = 80 kg, repetitions = 5), the results are: epley estimate 93.3 kg; brzycki estimate 90.0 kg.
Quick reference: weight lifted vs result
Reference table based on the example values; it is not your calculation result.
| Weight lifted (kg) | Epley estimate | Brzycki estimate |
|---|---|---|
| 40 | 46.7 kg | 45.0 kg |
| 80 | 93.3 kg | 90.0 kg |
| 160 | 186.7 kg | 180.0 kg |
| 400 | 466.7 kg | 450.0 kg |
| 800 | 933.3 kg | 900.0 kg |
| 1,600 | 1,866.7 kg | 1,800.0 kg |
Frequently asked questions
What formula does this calculator use?
Epley estimate = w × (1+reps ÷ 30); Brzycki estimate = w × 36 ÷ (37-reps). Variables: w = weight lifted in kg, reps = repetitions.
What do I need to enter?
You need weight lifted (kg), repetitions. Results update as you type.
What is an example result?
With the default inputs (weight lifted = 80 kg, repetitions = 5), the results are: epley estimate 93.3 kg; brzycki estimate 90.0 kg.
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