One Rep Max Calculator
Calculate your maximum lifting capacity
96 kg
Estimated One Rep Max
96
100%
91
95%
86
90%
82
85%
77
80%
72
75%
67
70%
62
65%
58
60%
48
50%
How It Works
- Select the formula you prefer (Epley is default, or choose Brzycki, Lombardi, or Average).
- Enter the weight you lifted.
- Input the number of reps you performed.
- Click Calculate to see your estimated one-rep max.
- View percentage breakdowns for different training intensities.
Frequently Asked Questions
What is a one-rep max (1RM)?
One-rep max is the maximum amount of weight you can lift for a single repetition of a given exercise. It's used to measure strength and determine appropriate training loads for different rep ranges.
Which formula should I use?
Epley is most accurate for lower reps (1-10). Brzycki works well for moderate reps. Lombardi is better for higher reps. The Average option combines all three for a balanced estimate. Use what works best for your training style.
Is this calculator free to use?
Yes, ApexSofteck Tools's One Rep Max Calculator is completely free. Use it unlimited times to plan your strength training without any registration.
How accurate is the estimate?
Estimates are most accurate when based on 3-10 reps. Single-rep estimates from high-rep sets (15+) are less reliable due to endurance factors. Always prioritize safety - use spotters when attempting true 1RM attempts.
How do I use the percentages?
Different percentages target different goals: 85-95% for strength (1-5 reps), 70-85% for hypertrophy (6-12 reps), 50-70% for endurance (12+ reps). Use these to plan your training cycles and progressive overload.