1RM Percentage Chart: How to Use Your One-Rep Max for Training

The Master Reference Table: % 1RM to Reps

This is the fundamental tool of percentage-based strength programming. Values are derived from ACSM evidence-based guidelines and validated rep-max continuum research:

The 5 Standard 1RM Formulas

Multiple formulas exist because no single equation is universally accurate. Compare across formulas when your estimated rep count is above 5:

1. Epley (1985) `` 1RM = Weight × (1 + 0.0333 × Reps) ` Best for: General use, 6–12 rep range. Most commonly used formula worldwide.

2. Brzycki (1993) ` 1RM = Weight × (36 / (37 − Reps)) ` Best for: 1–10 rep range. Slightly more accurate than Epley below 10 reps.

3. Lander (1985) ` 1RM = (100 × Weight) / (101.3 − 2.67123 × Reps) ` Best for: 1–10 reps. Good accuracy for trained athletes.

4. Lombardi (1989) ` 1RM = Weight × Reps^0.10 ` Best for: Higher rep ranges (8–15). Tends to slightly underestimate at lower reps.

5. O'Conner (1989) ` 1RM = Weight × (1 + 0.025 × Reps) ` Best for: Conservative estimate. Tends to produce lower 1RM values, useful as a safety minimum.

Example: How Different Formulas Differ at 100kg × 8 reps

Using the average of multiple formulas produces a more reliable estimate than any single formula.

Practical Programming: Rep Schemes by Goal

Maximal Strength (Powerlifting, Olympic lifting)

Scheme	Intensity	Volume	Example
5×5	80–85% 1RM	Moderate	Classic strength builder, 3× per week
3×3	87–92% 1RM	Low	Peaking; high specificity, low fatigue
1×1 (singles)	93–100%	Very low	Competition prep or true 1RM testing

Hypertrophy (Bodybuilding, Physique)

Scheme	Intensity	Volume	Example
4×8	75–80% 1RM	High	Classic size stimulus
3×10–12	67–75% 1RM	High	High-volume metabolic stress
6×6	80–85% 1RM	High	Strength-hypertrophy bridge

Muscular Endurance (CrossFit, sport-specific)

Scheme	Intensity	Volume
3×15–20	55–65% 1RM	High reps
Circuit training	50–60% 1RM	Multiple exercises

The Wilks Score: Comparing Strength Across Body Weights

If you want to compare your lifts against athletes of different body weights, the Wilks score normalises for body weight:

` Wilks Score = Total lifted (kg) × Coefficient ``

Where the coefficient is derived from a polynomial equation based on body weight. A Wilks score above 300 is competitive amateur level; above 400 is national-calibre; above 500 is elite/international.

For example, a 70kg male who totals 500kg (170+120+210) has a Wilks score of approximately 345. A 100kg male who totals 620kg has a Wilks score of approximately 340 — demonstrating that the lighter lifter has slightly better relative strength despite lifting 120kg less total.

Volume and Load Interaction: What the Research Says

Schoenfeld et al. (2017) demonstrated a clear dose-response relationship between weekly training volume and muscle hypertrophy:

• <5 sets/muscle/week: Minimal hypertrophic stimulus
• 5–9 sets/muscle/week: Moderate hypertrophy
• 10–20 sets/muscle/week: Optimal range for most trained individuals
• >20 sets/muscle/week: Diminishing returns; recovery becomes limiting

This is why simply going heavier (higher % 1RM) does not always produce more muscle growth — the total weekly sets per muscle group is equally important as the intensity of each set.

Progressive Overload: The Fundamental Principle

The ACSM's evidence-based recommendation for load progression:

> "When the individual can perform the current workload for one or two repetitions over the desired number on two consecutive training sessions, increase the load."

Practical application:

• Target: 3 × 8 at 80kg
• Session 1: 3 × 8, 8, 9 — one extra rep in set 3
• Session 2: 3 × 8, 9, 9 — extra reps in sets 2–3
• Session 3: Increase to 82.5–85kg — return to 3 × 8

This "double progression" method (reps first, then load) ensures consistent adaptation stimulus without premature increases that compromise form.