One Rep Max (1RM) Strength Calculator (Brzycki & Epley Formulas)
Calculate your estimated One Rep Max (1RM) for Bench Press, Squat, and Deadlift using validated Brzycki and Epley formulas, complete with working training percentages.
Calculator Inputs
Live Real-TimeEstimated One Rep Max (1RM)
90% 1RM (3-4 Reps Strength)
85.01 kg
80% 1RM (7-8 Reps Hypertrophy)
75.56 kg
70% 1RM (10-12 Reps Endurance)
66.11 kg
Epley Formula 1RM
96 kg
Strong Strength Capacity: Your working sets indicate strong neuromuscular recruitment potential.
Working Weight Percentages
Detailed Calculation Breakdown
Calculation Methodology
Brzycki Formula: 1RM = Weight * (36 / (37 - Reps)). Epley Formula: 1RM = Weight * (1 + (Reps / 30)).
Important Legal & Educational Disclaimer
This exercise physiology tool estimates maximum muscular strength safely from sub-maximal repetitions.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
Frequently Asked Questions
Related Calculators
Recommended tools and calculators tailored to your current calculation
Weightlifting Pyramid Sets & Working Load Calculator (Bench Press & Squats)
Generate optimized ascending pyramid training workout sets with exact barbell loading percentages, repetition targets, and total session tonnage volume.
Powerlifting Wilks & DOTS Strength Score Calculator
Calculate your official DOTS and Wilks powerlifting coefficient scores to compare relative strength performance across different bodyweight classes (IPF Standard).
BMI & Ideal Body Weight Calculator
Calculate your Body Mass Index (BMI), healthy weight range, and body classification based on WHO standards.
Body Fat Percentage & Lean Body Mass Calculator (Deurenberg)
Calculate body fat percentage, total fat mass, and lean body mass (LBM) using the validated Deurenberg clinical anthropometric formula with fitness category benchmarking.
Body Frame Size Calculator (Height to Wrist Circumference Ratio)
Determine your clinical skeletal body frame size (Small, Medium, Large) using height-to-wrist anthropometric ratios to refine ideal weight and muscle growth potential.
Creatine Monohydrate Daily Dosage & Loading Phase Calculator
Calculate your personalized daily creatine monohydrate dosage by body weight, explore rapid loading vs steady maintenance protocols, and calculate hydration requirements.
Blood Alcohol Content (BAC) & Sobriety Time Calculator (Widmark)
Calculate estimated Blood Alcohol Content (BAC) percentage and hours until full sobriety (0.00%) using the clinical Widmark formula based on weight, sex, standard drinks, and elapsed time.
Ideal Body Weight (IBW) Calculator (Devine & Robinson Formulas)
Calculate your ideal body weight (IBW) based on height and biological sex using validated clinical formulas (Devine, Robinson, and Miller) and WHO healthy BMI weight boundaries.