5/3/1 Calculator

Jim Wendler's 5/3/1 program bases all working sets on a 90% training max.

How the Math Works

The 5/3/1 Calculator uses a two-step mathematical process to determine training weights. First, it calculates your Training Max (TM) by taking 90% of your one-rep max (1RM) for the target lift. This 10% reduction accounts for daily fluctuations in strength and recovery capacity. Second, it applies percentage-based sets based on this Training Max: typically 65%, 75%, and 85% for the three working sets, with optional backoff sets at reduced percentages. For example, if your 1RM in squat is 300 pounds, your TM becomes 270 pounds, and your working sets would be 175.5, 202.5, and 229.5 pounds respectively.

Practical Applications

To use this calculator practically, first determine your current 1RM for each major lift through testing or estimation. Enter these values into the 5/3/1 Calculator to generate your four-week training cycle, which follows the classic 5/3/1 progression pattern with increasing percentages each week (Week 1: 65%/75%/85%, Week 2: 70%/80%/90%, Week 3: 75%/85%/95%, Week 4: 60%/65%/70% with assistance work). After completing the three-week cycle, reduce your Training Max by 10% before starting a new cycle, creating a sustainable long-term progression model that balances intensity and recovery.

Day-to-Day Use

This calculation method transforms your daily gym routine from guesswork to precision, ensuring you're consistently challenging yourself at appropriate intensities without overtraining. By following the structured percentages, you eliminate decision fatigue about what weight to use each workout while maintaining optimal progressive overload. The system's built-in deload weeks and 10% reductions prevent plateaus and injuries, making it ideal for lifters who want consistent, measurable progress over months and years rather than sporadic gains. This mathematical approach turns strength training into a data-driven habit that fits seamlessly into a busy lifestyle.

Worked example

100 kg 1RM → TM 90 kg; week 1 sets 58.5, 67.5, 76.5 kg.

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