One Rep Max Calculator
Instantly Calculate Your 1RM for Squat, Bench Press, Deadlift & All Strength Training Lifts
Accurate 1RM & Max Rep Calculations You Can Trust
Our calculator uses proven one rep max equations and rep max conversion charts to estimate your true strength level. Whether you're testing a 5RM, 3RM, or estimating 1RM, results are fast and reliable.
One Rep Max Calculator for Every Lift
Squat 1RM Calculator
Calculate your one rep max for squats using any rep range. Perfect for tracking lower body strength progress.
Bench Press 1RM Calculator
Estimate your bench press one rep max accurately. Essential for upper body strength training programs.
Deadlift One Rep Max
Determine your deadlift 1RM safely without maxing out. Critical for posterior chain strength assessment.
Leg Press to Squat Conversion
Convert your leg press numbers to estimated squat strength. Useful for rehabilitation and training transitions.
e1RM Calculator (Estimated 1RM)
Get your estimated one rep max from any submaximal set. Works for all exercises and training styles.
Why Knowing Your 1RM Matters
Track weightlifting PRs
Monitor your strength progress over time and celebrate personal records.
Plan strength programs
Design effective training cycles based on accurate strength assessments.
Avoid injury
Train at appropriate intensities without risking overexertion or strain.
Improve progressive overload
Systematically increase training load for continuous strength gains.
How It Works
Brzycki Formula
Used for 1-8 reps: 1RM = Weight × (36 / (37 − Reps)). Most accurate for lower rep ranges commonly used in strength training.
Epley Formula
Used for 10+ reps: 1RM = Weight × (1 + Reps / 30). Better suited for higher rep ranges typical in bodybuilding and endurance work.
For 8-10 reps: We calculate the average of both formulas to provide the most accurate estimate. All results are rounded to the nearest 0.5 for practical use.
Understanding Training Percentages
Training at specific percentages of your 1RM targets different adaptations:
Advanced Strength Calculators
RPE Calculator
Calculate Rate of Perceived Exertion for precise training intensity management.
RPE to Percentage Chart
Convert RPE values to training percentages for program design.
Warm-Up Set Calculator
Plan your warm-up sets efficiently before your working sets.
5x5 & 5/3/1 Calculator
Calculate weights for popular strength training programs.
Grip Strength Calculator
Assess and track your grip strength for functional fitness.
Frequently Asked Questions
Everything you need to know about calculating your one-rep max
Calculate Your One Rep Max Now
Get instant, accurate 1RM calculations for all your lifts