One Rep Max Calculator
Estimate your 1RM from any lift plus training percentages.
🔄 Updated October 13, 2026
About the One Rep Max Calculator
The One Rep Max Calculator helps you track an important health number in seconds. Estimate your 1RM from any lift plus training percentages. Results are estimates for awareness and planning — always consult a qualified professional for medical advice. You may also like the BMI Calculator and TDEE Calculator.
How to use this calculator
- Enter your numbers in the fields above.
- Results update instantly — no button to press, no page reload.
- Adjust the inputs to compare scenarios with the One Rep Max Calculator.
Keep exploring: BMI Calculator · Calorie (BMR) Calculator · Age Calculator · Pregnancy Calculator
Frequently asked questions
What is 1RM?
The heaviest weight you can lift once with good form.
Which formula is used?
The Epley formula — accurate for most rep ranges.
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