One Rep Max Formula
The One Rep Max (1RM) formula provides an estimated maximum weight you can lift for a single repetition, crucial for programming your strength training effectively.
Formula
Copy the exact expression or work through it step by step below.
Estimated 1RM = Lifted Weight x (1 + Reps / 30) Variables
E1
Estimated 1RM
The estimated 1rm value plugged into the one rep max calculation.
LW
Lifted Weight
The lifted weight value plugged into the one rep max calculation.
Reps
Reps
The reps value plugged into the one rep max calculation.
Step By Step
- 1
Set the baseline case with the real calculator inputs.
Weight Kg = 100, Reps = 5, Formula = Brzycki
- 2
Translate rates, periods, and cash values onto the same footing before combining them.
Keep the one rep max assumptions consistent instead of mixing monthly and annual views.
- 3
Apply the formula and read the first calculator outputs, not just the headline assumption.
The calculator lands with epley at 116.67 and brzycki at 112.5.
- 4
Run one changed scenario so the formula is stress-tested before it is trusted.
The one rep max calculator page is the fastest way to compare that second case.
Worked Example
One Rep Max sample case
Weight Kg
100
Reps
5
Formula
Brzycki
Estimated 1RM = Lifted Weight x (1 + Reps / 30) using weight kg 100, reps 5, formula Brzycki.
The calculator lands with epley at 116.67 and brzycki at 112.5.
Common Variations
Try These Tools
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Sources & References
- A Comparison of One-Rep Max Prediction Methods for the Bench Press Exercise — National Center for Biotechnology Information (NCBI)
- Predicting one-repetition maximum (1RM): a comparison of different equations and their accuracy — Journal of Strength and Conditioning Research
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