Ultimate Rep Max Calculator

Stop guessing your max. Start knowing it. Ultimate Rep Max Calculator uses 6 scientifically-validated formulas to estimate your one-rep max from ANY set you perform—not just heavy singles. Enter multiple sets with varying weights, and the app automatically identifies your best 1RM estimate. ACCURATE 1RM CALCULATIONS • 6 proven formulas: Epley, Brzycki, Wathan, Lombardi, Mayhew & O'Conner • RPE/RIR adjustment for sets not taken to failure • Multi-set input supports pyramids, ramp-ups, and drop sets • Calculates from your best-performing set automatically RM MATRIX • See recommended weights for every rep range (1-20 reps) • Color-coded training zones: Strength, Hypertrophy, Endurance • Visual chart shows the full strength curve FATIGUE MATRIX • Understand how rest periods affect your performance • Project reps across 5 sets at different rest intervals • Optimize your rest times for your goals SMART WARM-UP CALCULATOR • Auto-generated warm-up pyramid based on your working weight • Progressive loading prepares muscles and CNS • Never walk into a heavy set cold again INTENSITY TECHNIQUES • Calculate drop set progressions and projected reps • Rest-pause technique planning • Compare effective reps across training methods REVERSE CALCULATOR • Input your target sets, reps, and rest time • Get the exact weight recommendation • Perfect for programming and deload planning SAVE & COMPARE • Save exercises to track your maxes over time • Compare lifts across your training history • All data stored locally—your privacy protected Built for serious lifters by AGX Performance. No subscriptions. No ads. No data collection. Just the tools you need to get stronger.