One Rep Max Calculator
1RM Formulas
• Brzycki: 1RM = Weight / (1.0278 - 0.0278 × Reps)
• Epley: 1RM = Weight × (1 + Reps / 30)
• Lombardi: 1RM = Weight × Reps^0.1
About This Calculator
This one rep max calculator helps you move from raw inputs to a decision-ready output in seconds.
Inside fitness, this tool gives you a practical way to model scenarios, compare outcomes, and make better next-step decisions without spreadsheet overhead.
If your workflow expands, pair this calculator with Target Heart Rate Calculator and Running Pace Calculator to cross-check assumptions and build a stronger analysis chain.
Formula
Use the calculator inputs to apply the underlying method and return a consistent result instantly.
Example Calculation
The worked example below demonstrates how the input fields translate into the final output. Use it as a quick validation pass before entering your own numbers.
- input value: 10
- comparison value: 4
Explanation of Results
Result Interpretation
The one rep max calculator returned computed result based on input value 10 and comparison value 4. Use this result as a baseline, then adjust one input at a time to understand how sensitive your outcome is before making decisions.
FAQ
How should I validate the one rep max calculator result?
Run a second scenario with rounded numbers, then compare the direction and magnitude of the change before using the value operationally.
What formula is this based on?
This page uses the following formula logic: Use the calculator inputs to apply the underlying method and return a consistent result instantly.
Can I bookmark this fitness tool?
Yes. Use the canonical URL /everyday-life-health/fitness/one-rep-max-calculator to return to this calculator in the Everyday Life & Health library.
Related Calculators
Continue exploring tools in this topic cluster to improve internal discoverability and reduce orphaned workflows.
See Also
Other calculators in Fitness