How to Use Velocity-Based 1RM Estimator
The Velocity-Based 1RM Estimator infers your one-rep max from the velocity-load relationship without requiring a maximal effort. Enter bar velocity at a known submaximal load and your minimum velocity threshold; the tool extrapolates to a predicted 1RM and shows how far it is extrapolating, so you can judge the estimate's reliability.
What It Does
Use the calculator with intent
The Velocity-Based 1RM Estimator infers your one-rep max from the velocity-load relationship without requiring a maximal effort. Enter bar velocity at a known submaximal load and your minimum velocity threshold; the tool extrapolates to a predicted 1RM and shows how far it is extrapolating, so you can judge the estimate's reliability.
Athletes, coaches, and AI agents who need a quick, reproducible answer with named limitations rather than a generic estimate.
Interpreting Results
The hero number is your estimated 1RM derived from the velocity-load relationship. Read the secondary stats for the minimum velocity threshold used and the load percentage at which your input velocity was measured — both determine how far the model is extrapolating. An estimate based on a velocity measured close to your actual 1RM velocity threshold is more reliable than one based on a light set where the curve extrapolates a long way.
Input Steps
Field by field
- 1
Enter inputs
Enter your values using the sliders and steppers. Defaults represent a reasonable midpoint.
- 2
Read outputs
Read the hero number first. Secondary stats provide context and ranges.
- 3
Follow
Follow the methodology link for formulas, coefficients, and citations.
- 4
Adjust parameters
Adjust each input one at a time to see how the hero number responds.
Enter the bar velocity from a fresh first set and compare it with a final-set velocity at the same load — if the final set is clearly slower, fatigue has already moved your velocity-load profile and the 1RM estimate needs to be read as a lower bound.
Common Scenarios
Use realistic starting points
FAQ
Questions people ask next
The short answers readers usually want after the first pass.