One Rep Max CalculatorHow to estimate your squat max
Warm up, then squat a weight for 3 to 5 clean reps, stopping before your form breaks. Enter the weight and reps. With Epley, 275 lb for 3 reps gives a max of about 302 lb. Keep the reps at 5 or fewer, because rep tests for the squat lose accuracy above that.
The worked math: 275 x (1 + 3 / 30) = 275 x 1.1 = 302.5 lb. Brzycki gives 275 x 36 / 34 = 291.2 lb. With low reps, the formulas stay close together.
Why low reps matter for the squat
The HPRC, which shares the NSCA testing plan, says rep tests for the back squat are not very reliable above a 5 rep max. Form breaks down and fatigue sets in on long, heavy sets (HPRC).
The 1997 study by LeSuer and others found all seven formulas tracked real maxes on this lift with correlations above 0.95. Even so, only 1 of the 7 had an average error close to zero for the squat (LeSuer and others, 1997). So use the estimate to pick training weights, then adjust by feel.
Squat percent chart
Based on the NSCA load chart, here are loads for a 300 lb max:
| % of max | Weight (300 lb max) | About reps |
|---|---|---|
| 95% | 285 lb | 2 |
| 93% | 279 lb | 3 |
| 90% | 270 lb | 4 |
| 87% | 261 lb | 5 |
| 85% | 255 lb | 6 |
| 80% | 240 lb | 8 |
| 75% | 225 lb | 10 |
Source: NSCA Training Load Chart.
Testing a true 1RM on the squat
If you want to test a real max, follow the NSCA steps on the one rep max page. For lower body lifts like the squat, the jumps are bigger than for the bench:
- Add 30 to 40 lb, or 10% to 20%, at each warm up step.
- Rest 2 to 4 minutes between heavy tries.
- If you miss, take off 15 to 20 lb, or 5% to 10%, and try again after rest.
- Squat inside a rack with safety bars set just below your bottom position.
More tools
Related guides
FAQ
How many reps should I use to estimate my squat max?
Use 5 reps or fewer. HPRC notes that rep tests for the back squat are not very reliable above a 5 rep max, because form breaks down and fatigue sets in. A hard set of 3 to 5 reps gives a better estimate.
Is the squat estimate exact?
No. In a 1997 study, all seven formulas tracked real maxes closely, but only one had an average error close to zero. Treat the number as a guide for picking training weights, not as a promise.
How much weight should I add when testing my squat?
For lower body lifts, the NSCA plan adds about 10% to 20% per step on the way up. If you miss, rest 2 to 4 minutes and take off 5% to 10%. Always use safety bars or spotters.
What percent of my max should I train with?
For strength, the NSCA suggests 4 to 6 reps at 85% or more. For muscle size, 6 to 12 reps at 67% to 85%. The chart in the tool turns these into weights.
References
- What is a one rep max? Human Performance Resources by CHAMP (HPRC), Uniformed Services University
- LeSuer DA et al. The accuracy of prediction equations for estimating 1RM performance in the bench press, squat, and deadlift. J Strength Cond Res. 1997;11(4):211-213
- Training Load Chart, National Strength and Conditioning Association (NSCA)
- American College of Sports Medicine position stand. Progression models in resistance training for healthy adults. Med Sci Sports Exerc. 2009 (PubMed)