Squat Max Calculator
Estimate your squat one-rep max (1RM) from any weight × reps set — Epley, Brzycki and Lombardi side by side. Plus a training percentage table, rep-max chart, plate loader and bodyweight-ratio standards.
Estimate your squat 1RM
Average estimate: – kg
Estimates agree best on sets of 3–10 reps taken close to failure with full depth. Reps above ~12 make every formula unreliable.
Training percentages
| % of 1RM | Weight | ≈ Reps | Zone |
|---|---|---|---|
| 95% | 133 kg | 2 | Max strength |
| 90% | 126 kg | 3 | Max strength |
| 85% | 119 kg | 5 | Strength |
| 80% | 112 kg | 8 | Strength |
| 75% | 105 kg | 10 | Hypertrophy |
| 70% | 98 kg | 13 | Hypertrophy |
| 65% | 91 kg | 16 | Hypertrophy |
| 60% | 84 kg | 20 | Endurance / technique |
| 55% | 77 kg | 25 | Endurance / technique |
| 50% | 70 kg | 30 | Endurance / technique |
Default table shown for a 140 kg 1RM. It updates automatically when you estimate your max above.
Rep-max chart
| Reps | Weight | Reps | Weight | Reps | Weight |
|---|
Plate loader
Standard bar assumed: 20 kg (kg mode) or 45 lb (lb mode). Load heaviest plates first, collar optional — collars are not counted.
Bodyweight ratio
Ratio: – × bodyweight
Rough, commonly cited back-squat benchmarks: ~1× bodyweight = beginner milestone, 1.25–1.5× = intermediate, 1.75–2× = advanced, 2×+ = elite. Approximate milestones, not official tiers.
Worked examples
Epley 116.67 kg · Brzycki 112.5 kg · Lombardi 117.46 kg — a typical first estimate; use ~87–93 kg for 5×5 work.
Epley 154 kg · Brzycki 148.24 kg · Lombardi 156.26 kg — all three agree within ~5 kg, so confidence is high.
Epley 80 kg · Brzycki 80 kg · Lombardi 75.54 kg — note Epley and Brzycki coincide exactly at 10 reps (a known property: the formulas cross near r = 10).
Epley 101.33 kg · Brzycki 99.31 kg · Lombardi 98.49 kg — the spread (~3 kg) is normal; program off the average or the most conservative.
The formulas
- Epley (1985): 1RM = weight × (1 + reps / 30) — the most widely used.
- Brzycki (1993): 1RM = weight × 36 / (37 − reps) — slightly more conservative; valid for reps < 37.
- Lombardi (1989): 1RM = weight × reps0.10 — often the highest at moderate rep ranges.
All three are empirical approximations, not physical laws. They agree best on sets of 3–10 reps taken close to muscular failure.
Frequently asked questions
What is a squat 1RM and why estimate it instead of testing it?
Your squat 1RM (one-rep max) is the heaviest weight you can squat for a single clean repetition, typically to below-parallel depth. Estimating it from a submaximal set (for example 100 kg × 5 reps → about 116.67 kg by Epley) is safer than loading a true max attempt, especially for beginners — you get a training number without the injury risk, the need for spotters, and the fatigue of maxing out.
Which 1RM formula is most accurate for squats — Epley, Brzycki, or Lombardi?
No formula is exact; all are approximations within roughly ±5–10%. Epley (weight × (1 + reps/30)) is the most widely used and works well for 3–10 reps. Brzycki (weight × 36/(37 − reps)) runs slightly more conservative, which suits squats, where depth and bracing tend to break down near a true max. Lombardi (weight × reps^0.10) usually sits highest at moderate rep ranges. This calculator shows all three so you can see the range — a tight cluster means higher confidence.
Do I need a spotter when testing my squat max?
Yes — never attempt a true heavy squat single alone. Use either two competent spotters (one on each side) or, better for solo training, a power rack with safety arms set just below your lowest squat depth. Safety arms catch a failed rep; a single spotter standing behind you cannot safely catch a heavy barbell. Even for submaximal sets above 85% of your estimated max, safety arms are cheap insurance.
What counts as proper squat form for a max attempt?
A valid max rep keeps the same standards as your training reps: the bar balanced over mid-foot, hips breaking parallel (hip crease below the top of the knee), full bracing with the breath held under load, and no excessive forward pitch. If your depth rises or your form collapses around 95% and above, that is your training max, not your competition max — reduce the weight and re-test. Film your sets from the side to judge depth honestly.
How should I warm up before a heavy squat attempt?
A common ramp: 5 minutes of general warm-up, then the empty bar × 10, about 50% of your estimated max × 5, 70% × 3, 80–85% × 1–2, then your work or test sets, resting 3–5 minutes between heavy sets. Jumping straight from the bar to a max attempt is how injuries happen; the ramp also lets you judge how the weight feels that day before you commit to anything heavy.
What is a good squat relative to my bodyweight?
Divide your estimated 1RM by your bodyweight — that ratio is what most strength-standard charts are built on. As rough, commonly cited benchmarks for the back squat: around 1× bodyweight is a solid beginner milestone, 1.25–1.5× is intermediate, 1.75–2× is advanced, and 2×+ is elite territory. Standards vary by source, sex, age, and depth standard, so treat these as approximate milestones rather than official tiers.
What weight should I use for 5×5 squats?
Most 5×5 programs start around 75–80% of your estimated 1RM and add a little weight each session. For the example above — 100 kg × 5 reps giving an Epley estimate of 116.67 kg — that is 87.5 kg at 75% and 93.34 kg at 80% (many lifters round to 87.5 and 92.5–95 kg). As your 5-rep sets get easier, re-estimate from the new best set and move the percentages up with it.
How is this different from a generic one-rep max calculator or the deadlift max calculator?
The math is the same family of formulas, but this page is built around the squat: a plate loader sized for a standard 20 kg / 45 lb bar, bodyweight-ratio bands with squat-specific milestones, a percentage table with squat training zones, and safety guidance specific to heavy squats (spotters, safety arms, depth, warm-up). For a lift-agnostic estimate, use our one-rep max calculator; for deadlift-specific guidance, use our deadlift max calculator.
Free tool by NRTechStudio