Updated
Using Lifting strength calculator
Compare a lifted load and its Brzycki estimated one-rep maximum with body weight.
Relative load is load divided by body weight. Estimated one-rep maximum uses load / (1.0278 - 0.0278 x reps), for 1-10 completed repetitions. No novice, elite or safe-load category is assigned: performance depends on exercise, technique, equipment and population. The estimate is not an instruction to attempt a maximum.
A worked example
For load lifted (kg or lb) = 100, body weight in the same unit = 80, completed repetitions = 5, lifted load / body weight = 1.25.
Before you use the result
Relative load is load divided by body weight. Estimated one-rep maximum uses load / (1.0278 - 0.0278 x reps), for 1-10 completed repetitions. No novice, elite or safe-load category is assigned: performance depends on exercise, technique, equipment and population. The estimate is not an instruction to attempt a maximum.
Example results for load lifted (kg or lb)
These examples use Body weight in the same unit: 80; Completed repetitions: 5. They are reference calculations, not recommended settings.
| Load lifted (kg or lb) | Lifted load / body weight |
|---|---|
| 50 | 0.625 |
| 100 | 1.25 |
| 200 | 2.5 |
Cite this page
ToolOctopus. “Lifting strength calculator.” Updated 2026-09-29. https://tooloctopus.com/lifting-strength-calculator.
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