How accurate are 1RM calculators?

1RM calculators are generally accurate within 5-10% when used with rep ranges under 10. The accuracy depends on factors like training experience, muscle fiber composition, and the specific formula used. Our calculator uses 7 different formulas to give you the most comprehensive estimate.

Which 1RM formula is most accurate?

The Epley formula is most widely used and accurate for most people, especially with rep ranges of 2-10. However, different formulas work better for different individuals. Brzycki tends to be conservative, while Lombardi works well for powerlifters. Our calculator shows all 7 formulas so you can compare.

Can I use this for any exercise?

Yes, you can use 1RM calculators for any compound exercise like bench press, squat, deadlift, overhead press, and rows. The formulas are based on general strength principles that apply across exercises, though they're most accurate for compound movements.

What rep range should I use for the most accurate calculation?

For best accuracy, use rep ranges between 2-10 reps. The sweet spot is 3-8 reps where most formulas perform optimally. Avoid using very high rep ranges (15+) as the formulas become less reliable due to muscular endurance factors.

How often should I recalculate my 1RM?

Recalculate your 1RM every 4-6 weeks or whenever you notice significant strength gains. For beginners, monthly calculations work well. Advanced lifters might recalculate every 6-8 weeks. Always use recent max effort sets for the most accurate results.

What is a Wilks score?

A Wilks score is a coefficient-based number that adjusts a powerlifter's total (squat + bench + deadlift) for their bodyweight, allowing comparison of strength across weight classes. It was developed by Robert Wilks in the 1990s and updated to Wilks 2 in 2020. A higher Wilks score means a relatively stronger lifter, regardless of bodyweight.

How is the Wilks score calculated?

The Wilks 2 formula multiplies the lifter's total by 600 and divides by a fifth-degree polynomial of bodyweight. The polynomial uses different coefficients for male and female lifters and was fit to championship powerlifting performance data. Bodyweight is converted to kilograms before applying the formula. Use the calculator on this page to compute your Wilks 2 score.

What is a good Wilks score?

For male lifters: 300+ Wilks is intermediate, 400+ is advanced, 500+ is national-level competitive, and 550+ is world-class. For female lifters: 300+ is advanced, 400+ is national-level, and 450+ is world-class. The scale is the same for men and women — Wilks is designed to make the comparison fair across sexes.

Wilks vs DOTS vs IPF GL — which is the standard?

The IPF (International Powerlifting Federation) replaced Wilks with IPF GL Points in 2020 for official meets. USA Powerlifting and many regional federations adopted DOTS as their default. Wilks 2 (2020) is the modernized Wilks and is still common on training-log platforms. The three scores typically agree on ranking — a strong lifter is strong in all three formulas — but absolute numbers differ.

Why was Wilks 1 replaced with Wilks 2?

The original Wilks formula (1990s) was found to systematically over-reward heavier male lifters and under-reward lighter female lifters once two decades of additional powerlifting data accumulated. Robert Wilks recalibrated the polynomial coefficients in 2020 (Wilks 2) using more recent championship data. Wilks 2 is fairer across weight classes; the original Wilks is now considered obsolete.

Is the Wilks formula the same for men and women?

The structure of the formula is the same, but the polynomial coefficients differ between male and female lifters. The result is a unified scale: a 400 Wilks man and a 400 Wilks woman are both at roughly the same percentile of all-time championship-level lifters in their sex.

Should I use raw or equipped totals?

The Wilks formula doesn't distinguish between raw and equipped lifting — it just uses the total. In practice, equipped totals are typically 10-25% higher than raw totals (depending on equipment level), so equipped Wilks scores will be correspondingly inflated. When comparing your Wilks to others, ensure you're comparing within the same division (raw to raw, equipped to equipped).

Wilks 2 · 2020 coefficients

Wilks Calculator

Calculate your Wilks 2 score using the 2020 updated coefficients. Enter your bodyweight and your squat, bench, and deadlift maxes — the calculator returns your Wilks score plus DOTS and IPF GL points for direct comparison.

Enter your numbers

Bodyweight (lb)

Squat (lb)

Bench (lb)

Deadlift (lb)

Total: 1200 lb

Wilks 2

415.78

DOTS

350.55

IPF GL Points

72.08

Wilks score benchmarks

Wilks Score	Level	Context
200-300	Novice / Recreational	Just started competing or general gym lifter
300-400	Intermediate	Local meet competitor, regular powerlifter
400-470	Advanced	Regional / state-level competitor
470-525	National-level	Top-3 finisher at national meets
525+	World-class / Elite	World-record holder territory

Benchmarks apply to raw, drug-tested powerlifting. Equipped totals produce correspondingly higher Wilks scores; tested vs untested federations produce different ceilings.

Robert Wilks and the formula's origin

Robert Wilks was a competitive Australian powerlifter and long-serving administrator with the IPF — eventually rising to General Secretary, the federation's top operational role. In the early 1990s he developed his now-eponymous formula by fitting a fifth-degree polynomial of bodyweight to competition data from elite IPF lifters, with the explicit goal of replacing the older Schwartz-Malone tables that had been used to compare lifters across weight classes.

The original Wilks formula was adopted by the IPF in 1996 and remained the dominant powerlifting score globally for over two decades. Its widespread acceptance reshaped how meets ranked their “best lifter” awards and how lifters compared themselves across weight classes — for the first time, a 75kg lifter and a 120kg lifter could be plotted on a single percentile curve.

Wilks 1 → Wilks 2: what changed and why

By the late 2010s, two decades of accumulated competition data made it clear that the original Wilks coefficients had drifted from accuracy. Two specific biases became visible:

Heavyweight men were over-rewarded. The original polynomial flattened too aggressively above ~120 kg bodyweight, producing inflated Wilks scores for super-heavyweight lifters relative to medium-weight lifters of equivalent quality.
Light women were under-rewarded. The female coefficients didn't match the actual all-time-best curve in lighter classes (47-57 kg), producing systematically lower Wilks scores than fairness would dictate.

Wilks himself published a recalibrated set of coefficients in 2020, fitted against a much larger and more recent dataset of championship-level performances. Wilks 2 (the 2020 version, used in our calculator) is fairer across weight classes for both sexes. The original Wilks is now considered obsolete; if you see a calculator labeled simply “Wilks” without specifying which version, assume Wilks 2 if the source updated after mid-2020.

Why the IPF replaced Wilks anyway

Even with the Wilks 2 update, the International Powerlifting Federation moved to a completely different formula — IPF GL Points — for all official meets in 2020. Two reasons: first, IPF GL uses an exponential structure (asymptotic curve) that the federation's statisticians considered better-suited to the bodyweight distribution of modern competitive powerlifters; second, the federation wanted a scoring formula it controlled directly rather than one tied to a specific individual's research. USA Powerlifting and several drug-tested federations adopted yet a third formula — DOTS — independently around the same time. Wilks 2 remains widely used in training-log apps and on platforms like OpenPowerlifting.

Wilks vs DOTS vs IPF GL — head-to-head

Comparison of Wilks 2, DOTS, and IPF GL Points scoring formulas.
Property	Wilks 2 (2020)	DOTS (2019)	IPF GL (2020)
Math structure	5th-degree polynomial	4th-degree polynomial	Exponential / asymptotic
Federation	Independent	USAPL default	IPF official
Typical good score	400+ intermediate	400+ intermediate	75+ intermediate
Elite threshold	525+ world-class	575+ world-class	95+ world-class
Used by	Training logs, OpenPowerlifting	USAPL, drug-tested federations	IPF, all official IPF meets

The three systems usually rank lifters identically — a strong lifter is strong by all three. Absolute scores differ because each formula uses a different normalization scale; only compare scores within the same system.

Famous Wilks scores for reference

Ed Coan (1991): 2,463 lb total at 220 lb bodyweight. Wilks 2 estimate: ~635. Stood as the pound-for-pound benchmark for 25+ years; would still rank elite-of-elite under modern Wilks 2 calibration.
Stefi Cohen (2019): 545 lb deadlift at ~123 lb bodyweight (4.4× bodyweight). Single-lift Wilks wasn't the focus, but her full-meet Wilks 2 hit ~520 — well into world-class territory.
Lamar Gant (1980s): 5× bodyweight deadlift at 132 lb. Iconic in pound-for-pound comparisons; era-adjusted Wilks ~600.
Sergei Lyakhov / modern open lifters: Top lifters in IPF Classic regularly score 530-560 Wilks 2 across the men's open weight classes.