Squat Max Estimator Calculator

Measure squat strength with multi-formula one-rep predictions. See loading percentages, bodyweight context, and projected ranges. Make better programming choices for safer, stronger squat progress.

Calculator Inputs

Lifted Weight

Repetitions Performed

Bodyweight (Optional)

Unit

Sex for Relative Strength

Training Goal

Rounding Increment

Example Data Table

Lifted Weight	Reps	Bodyweight	Average 1RM	Relative Strength
100 kg	5	82 kg	115.94 kg	1.41x
225 lb	3	180 lb	242.30 lb	1.35x
140 kg	2	95 kg	148.61 kg	1.56x

These rows illustrate how the estimator can compare set performance, predicted one-rep max, and bodyweight-relative strength.

Formula Used

This calculator compares several common one-repetition maximum prediction formulas, then averages them for a balanced estimate.

Epley: 1RM = Weight × (1 + Reps / 30) Brzycki: 1RM = Weight × 36 / (37 - Reps) Lombardi: 1RM = Weight × Reps^0.10 O'Conner: 1RM = Weight × (1 + 0.025 × Reps) Wathan: 1RM = (100 × Weight) / (48.8 + 53.8 × e^(-0.075 × Reps)) Mayhew: 1RM = (100 × Weight) / (52.2 + 41.9 × e^(-0.055 × Reps)) Relative Strength = Average Estimated 1RM / Bodyweight

Prediction formulas work best on technically sound sets that stop short of major form breakdown. Very high-rep squat sets can reduce accuracy.

How to Use This Calculator

Enter the heaviest squat set you completed with reliable form.
Add the exact number of repetitions performed.
Select kilograms or pounds to match your training logs.
Optionally enter bodyweight for relative strength analysis.
Choose your training goal to get more useful loading guidance.
Select a rounding increment that matches your available plates.
Submit the form to view one-rep estimates above the form.
Use the percentage table, rep projections, and warm-up plan for programming.

Frequently Asked Questions

1. Which squat formula should I trust most?

No single formula is perfect for everyone. This calculator compares several respected methods and averages them, which often gives a more balanced training estimate than relying on one equation alone.

2. Are higher-rep squat sets less accurate for max prediction?

Yes. Most one-rep prediction formulas work better when the set stays in a moderate rep range and technique remains solid. Sets above about 10 to 12 reps can be less reliable.

3. Can I use kilograms and pounds?

Yes. Select the unit you use in training. The calculator keeps all results in that same unit, including formula estimates, working percentages, rep projections, and warm-up loads.

4. Why does the calculator show an average 1RM?

Different formulas react differently to reps. Averaging them helps smooth out extremes, giving you a practical estimate for planning sessions, percentages, and progress tracking.

5. Does squat depth affect the estimate?

Absolutely. A high squat and a competition-depth squat are not the same lift. Use sets performed with your target depth standard so the estimate matches your real training goal.

6. Should beginners test a true one-rep max?

Usually not right away. New lifters often benefit more from submaximal sets with good form. A prediction calculator can guide training without the fatigue and risk of a true max attempt.

7. How often should I update my squat max estimate?

Update it whenever performance meaningfully changes, such as after a training block, a rep PR, or a return from deloading. Frequent updates help keep your loading percentages useful.

8. Can I use this estimator for programming?

Yes. It is especially useful for choosing working weights, building warm-up sets, tracking relative strength, and planning intensity ranges across strength, hypertrophy, power, or general training phases.