What this tool is for
One Rep Max Calculator is built for wellness estimation inside health calculators when you need to estimates a max lift from weight and reps. It focuses on one rep max instead of making you adapt a broad calculator to a narrow task.
When to use it
Use it when weight lifted and reps are already known and you want a fast estimate before comparing options, checking a worksheet, or copying the result into another workflow.
Inputs
- Weight lifted is one of the direct inputs used to calculate one rep max. Use lb for this field.
- Reps is one of the direct inputs used to calculate one rep max. Use reps for this field.
Formula
1RM = weight x (1 + reps / 30)
Example
185 lb for 5 reps estimates about 215.83 lb.
What the result means
The result labeled "One Rep Max" is the direct output of 1RM = weight x (1 + reps / 30). In the worked example, 185 lb for 5 reps estimates about 215.83 lb.
Before you rely on the result
This is a general wellness estimate, not medical advice, diagnosis, or a treatment recommendation.