Formula Explanation
1RM = Weight x (1 + Reps / 30)
This calculator applies the formula 1RM = Weight x (1 + Reps / 30). Enter each value with the matching unit, and AZCalculate updates the result instantly.
Fitness
One Rep Max Calculator
Use this one rep max calculator to calculate estimate one rep max using the epley formula.
one rep max1rmstrengthfitness
Calculator
Calculate instantly
Calculator Inputs
Choose what you want to calculate, enter realistic values, adjust units where shown, and use the scenario section for repeated-use planning.
Input and Formula Breakdown
This calculator applies the formula 1RM = Weight x (1 + Reps / 30). Enter each value with the matching unit, and AZCalculate updates the result instantly.
Lifted weight
100 kg
Repetitions
5 reps
Estimated 1RM
116.67 kg
Scenario and Comparison
Current
116.67 kg
Projected
1,400
Adjusted
128.33
Visual Comparison
Current result116.67
Projected usage1,400
Comparison scenario128.33
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Use Cases
- Plan strength training
- Estimate max lift
- Compare progress
Step-by-Step Explanation
- Step 1Enter the known values in the calculator fields.
- Step 2Keep the units consistent with the labels shown beside each input.
- Step 3Apply the formula: 1RM = Weight x (1 + Reps / 30).
- Step 4Review the primary result and supporting values.
Example calculation
Example one rep max calculator
Given
- Lifted weight: 100 kg
- Repetitions: 5 reps
Steps
- Use the values shown above.
- Apply 1RM = Weight x (1 + Reps / 30).
Result
The calculator above shows the computed answer instantly from these example values.
Calculator guide
About this One Rep Max Calculator
Estimate one rep max using the Epley formula. This page includes an interactive calculator, concise formula notes, worked examples, FAQs, related calculators, and practical guidance you can revisit whenever needed.
Found something that does not look right?
We work hard to keep every calculator accurate and useful. If you notice a calculation error, missing option, or unclear explanation, please let us know so we can review and correct it promptly.
Calculator usage
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Live users now
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Total saved calculations
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Most active date
2026-06-05
FAQ
One Rep Max Calculator FAQs
How does the one rep max calculator work?+
It uses 1RM = Weight x (1 + Reps / 30) and calculates the result from the values you enter.
Can I copy or print the result?+
Yes. AZCalculate calculator pages include copy, share, and print actions.
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