Strength Calculator 2026
Estimate your One Rep Max (1RM) and optimal training zones. Instantly calculate training percentages, compare Epley and Brzycki formulas, and track your relative strength for powerlifting and bodybuilding.
Lift Configuration
Configure your exercise metrics and calculation preferences
The total weight moved for the working set
Number of continuous repetitions completed with good form
Used to calculate relative strength and standardized benchmarks
Mathematical models used to extrapolate maximum strength from submaximal lifts
Strength Profile
1RM, Training Zones & Relative Strength
Enter your lift metrics and select an exercise, then click Estimate 1 Rep Max to inspect your tailored strength profile.
Relative Strength Benchmarks
Standard relative strength multipliers (1RM / Bodyweight) for common powerlifting and bodybuilding movements.
| Exercise | Novice (1.0x) | Intermediate (1.5x) | Advanced (2.0x) | Elite (2.5x+) |
|---|---|---|---|---|
| Back Squat | 1.0x BW | 1.5x BW | 2.0x BW | 2.5x+ BW |
| Bench Press | 0.8x BW | 1.0x BW | 1.5x BW | 2.0x+ BW |
| Deadlift | 1.2x BW | 1.8x BW | 2.5x BW | 3.0x+ BW |
| Overhead Press | 0.5x BW | 0.75x BW | 1.0x BW | 1.25x+ BW |
| Barbell Row | 0.6x BW | 0.9x BW | 1.2x BW | 1.5x+ BW |
Strength Training FAQ
Learn more about calculating your 1RM, understanding training zones, and tracking relative strength standards.
A 1 Rep Max (1RM) is the maximum amount of weight you can lift for a single repetition of a given exercise with proper form. It is the gold standard for measuring maximal strength and is used to calculate all subsequent training percentages.
The Epley formula estimates 1RM based on the weight lifted and the number of repetitions performed. The formula is: 1RM = weight × (1 + reps / 30). It is highly accurate for rep ranges between 2 and 10, and is the most widely used equation in strength and conditioning.
Relative strength is the amount of weight you can lift compared to your own body weight. It is calculated by dividing your 1RM by your body weight, allowing for fair comparisons between athletes of different sizes and weight classes.
Testing a true 1RM is highly taxing on the central nervous system and carries a higher risk of injury. Most strength coaches recommend testing your true 1RM only once every 3 to 6 months, using submaximal calculators (like this one) for daily training percentages.
While muscle can be built across a wide spectrum of rep ranges, the 75-85% 1RM zone (typically 7-12 repetitions) is considered the “hypertrophy sweet spot.” It provides an optimal balance of mechanical tension and metabolic stress without causing excessive central nervous system fatigue.