Advanced One-Rep Max Calculator

Weight Lifted (kg): Repetitions: Calculate One-Rep Max

Body Fat Percentage Categories

Description	Women	Men
Essential fat	10-13%	2-5%
Athletes	14-20%	6-13%
Fitness	21-24%	14-17%
Average	25-31%	18-24%
Obese	32+%	25+%

One-Rep Max Calculator Documentation

The One-Rep Max Calculator estimates the maximum weight that can be lifted for one repetition based on the weight lifted and the number of repetitions. It uses established formulas to provide accurate results.

Formulas

The One-Rep Max (1RM) can be calculated using several different formulas. Some of the commonly used formulas are:

• Epley Formula: 1RM = Weight × (1 + Reps / 30)
• Brzycki Formula: 1RM = Weight × (36 / (37 - Reps))
• Lombardi Formula: 1RM = Weight × Reps^0.10
• Mayhew et al. Formula: 1RM = (Weight × 100) / (52.2 + (41.9 × e^(-0.055 × Reps)))

Usage

1. Enter the weight lifted in kilograms.
2. Enter the number of repetitions performed.
3. Click "Calculate One-Rep Max" to see the result.
4. Optionally, download a PDF report for record-keeping.

Body Fat Percentage Categories

The following table categorizes body fat percentage based on industry standards:

Description	Women	Men
Essential fat	10-13%	2-5%
Athletes	14-20%	6-13%
Fitness	21-24%	14-17%
Average	25-31%	18-24%
Obese	32+%	25+%

References

• Epley, B. (1985). Weight Training and Exercise Prescription for Strength.
• Brzycki, M. (1993). Strength Testing—Predicting a One-Rep Max from Reps-to-Fatigue.
• Lombardi, V. P. (1989). Beginning Weight Training: The Safe and Effective Way.
• Mayhew, J. L., Ball, T. E., Arnold, M. D., & Bowen, J. C. (1992). Relative Muscular Endurance Performance as a Predictor of Bench Press Strength in College Men and Women.