One-Rep Max Percentage Table

How to Use a 1RM Percentage Table for Strength Training

A one-rep max percentage table is the foundational tool behind every evidence-based percentage programming system — including Jim Wendler's 5/3/1, Boris Sheiko's templates, and the Daily Undulating Periodization (DUP) approach used by elite powerlifters. Instead of doing arithmetic mid-workout, you look up any percentage of your max and instantly know the correct training weight.

How 1RM is Estimated From Submaximal Reps

This calculator uses the Epley formula: 1RM = weight × (1 + reps/30). When you enter a set you performed (e.g., "140 kg for 5 reps"), the formula back-calculates your theoretical one-rep max. The Epley formula is most accurate for sets of 1–6 reps — accuracy decreases significantly above 8 reps as fatigue becomes a larger factor. Other common formulas include Brzycki, Lander, and O'Conner; they're all within 1–3% of each other for low-rep sets.

Important: estimated 1RMs are theoretical ceilings under optimal conditions. Your true 1RM on any given day is influenced by sleep quality, fatigue accumulation, nutrition, and warmup. Always treat estimates conservatively, especially for competitive attempts.

Understanding the Training Phases

• 50–65%: Technique, speed, and active recovery work. Very low fatigue. Often used in peaking weeks or as light day training.
• 65–75%: High-volume hypertrophy work. The "bread and butter" zone for muscle growth with manageable fatigue.
• 75–85%: Strength training zone. Classic 3–5 rep territory. Where most strength-focused programs spend the majority of time.
• 85–93%: Heavy strength and peaking work. 1–3 rep range. Significant CNS stress — requires adequate recovery between sessions.
• 93–97%: Near-maximal effort. Competition preparation territory. Low volume, high specificity.
• 100%: True 1RM. Only tested during competition or dedicated max testing sessions. Not to be repeated frequently.

5/3/1 and Percentage-Based Programming

Jim Wendler's 5/3/1 system popularized the use of a "Training Max" (typically 90% of true 1RM) from which all percentages are calculated. Week 1 uses 65/75/85%, Week 2 uses 70/80/90%, Week 3 uses 75/85/95%. This table generates weights from your true 1RM — if you use 5/3/1, multiply your 1RM by 0.90 first, then use those weights as your input.