How to use this Squat max calculator
- Enter the total completed squat load in the selected units.
- Enter one to ten repetitions from the same completed set. Select Calculate.
- Compare the two estimates and the Epley percentage table; use the plate calculator to check which loads your inventory can make.
The formula and method
The squat estimate uses only your completed load and repetition count. Epley = load × (1 + reps ÷ 30); Brzycki = load × 36 ÷ (37 − reps). For a completed single repetition, this tool returns the actual load with both methods.
Keep squat depth, bar position and equipment consistent in your records. A high-bar squat, low-bar squat and partial squat should not be treated as identical observations; this tool applies no depth or style correction.
The form accepts one to ten completed repetitions. The main result and percentage table use Epley; Brzycki appears as a comparison. Percentages from 50% to 90% are arithmetic fractions of the estimate, not a prediction of how many repetitions you can perform at each load.
Worked example
A completed 140 kg squat for 5 reps gives Epley = 163.33 kg and Brzycki = 157.50 kg. A 75% Epley working percentage is 122.50 kg.
Understanding the estimate
- Both formulas are estimates, and their difference is not a confidence interval.
- Repetitions left in reserve, fatigue, equipment and technique affect how representative a set is.
- The result does not assess readiness or provide clearance to attempt a maximum.
Frequently asked questions
Why do Epley and Brzycki give different results?
They use different relationships between load and repetitions. The tool shows both so the model choice stays visible; it does not claim one is universally accurate.
Which estimate drives the percentage table?
Epley drives every percentage shown. For example, the 80% row is the Epley estimate multiplied by 0.80.
Does the calculator verify squat depth?
No. It receives only load and reps. Record your own depth and variation consistently so that a change in technique is not mistaken for a comparable strength change.