Squat 1RM Calculator

How to estimate your squat max

Squat a weight you can move for 3–6 reps at your normal depth, stop before form breaks down, and enter the weight and reps above. For example, 225 lb × 5 estimates a squat max of roughly 253–268 lb, with an Average Estimate near 260 lb.

The squat was one of the three lifts in a classic comparison of seven 1RM equations against tested maxes in college students (LeSuer et al., 1997), alongside the bench press and deadlift. Predictions were strongly correlated with tested maxes — but a strong correlation is not the same as an exact match, and individual lifters can still land well above or below any formula.

Depth changes the number

A squat that stops a few inches higher is a much easier lift. If your 5-rep set was cut short but your max attempt would be to full depth, the estimate will read high — sometimes by a lot.

• Use the same depth for every rep and for any max you compare against. Powerlifting rules require the crease of the hip to drop below the top of the knee.
• Keep the setup consistent: the same bar position (high- or low-bar), stance and equipment, such as a belt or knee sleeves, as the max you want to predict.
• Count only reps you would show a judge — no half reps at the end of the set.

Squat safety for heavy sets

• Squat inside a power rack with the safety pins or straps set just below your lowest position, so a missed rep can be set down.
• If you use spotters for a max attempt, they should know the plan before you unrack.
• Learn to bail before you need to: practise sitting a light failed rep onto the safeties.
• Warm up gradually — the warm-up calculator builds a ramp with loadable weights.

Using your squat estimate in training

Squat programs often prescribe percentages such as 75–85% for sets of 3–6. Plan those from the Average Estimate or slightly below; an estimate from a set with shallow reps will make every percentage too heavy. When in doubt, re-estimate from a fresh, strict set rather than testing.

Worked example

The six formulas put this set between 253.1 and 267.8 lb— a 5.8% spread — with an Average Estimate of 260.5 lb.

Use the range, not just the middle number: plan training from the Average Estimate or lower, and treat the top of the range as optimistic.