MaxOut 1RM Strength Calculator

Calculate your one rep max with 7 scientific formulas. See your strength rank. Track PRs, plan warm-ups, load plates, and time rest all offline, all in one app.

Calculate your one rep max in seconds, see where you rank among lifters worldwide, and track your strength progress all in one app.

MaxOut uses the average of 7 scientifically proven formulas (Epley, Brzycki, Lander, Lombardi, Mayhew, O'Conner, and Wathan) to give you the most accurate 1RM estimate possible. No guesswork, no single-formula bias just precision.

HOW STRONG ARE YOU?

Enter your weight and reps for any major lift, and MaxOut instantly tells you:

• Your estimated one rep max
• Your strength rank: Beginner, Novice, Intermediate, Advanced, or Elite
• Your percentile "Stronger than 72% of lifters"
• Training percentages from 50% to 100% with recommended reps
• Exactly which plates to load on each side of the bar

Strength standards are built in for 10 barbell exercises across all body weight classes, for both men and women. Standards are based on published data from ExRx, NSCA, and aggregated competition results.

FEATURES

One Rep Max Calculator Calculate your 1RM using 7 formulas or pick a specific one. Supports kg and lbs with instant unit conversion.

RPE & RIR Adjustment Fine-tune your estimate using Rate of Perceived Exertion or Reps in Reserve. Uses RTS and Barbell Medicine methodology with interpolation for precise results at any RPE value.

Strength Standards & Rankings See how your lifts compare to global standards for Bench Press, Squat, Deadlift, Overhead Press, Barbell Row, Front Squat, Incline Bench, Romanian Deadlift, Weighted Pull-Ups, and Weighted Dips.

Plate Calculator Enter a target weight and see exactly which plates go on each side of the bar. Supports standard and Olympic plates in both kg and lbs. Configurable bar weight and available plates.

Warm-Up Set Calculator Get a complete warm-up plan based on your working weight. Progressive loading from empty bar to work set, with recommended reps and rest times for each set.

Relative Strength Scores Calculate your Wilks, DOTS, and IPF GL scores. The app automatically pulls your best Squat, Bench, and Deadlift from your saved history no need to enter them manually.

Rest Timer with Live Activity Time your rest periods between sets with a full-screen timer, Lock Screen Live Activity, and Dynamic Island countdown. Never miss your next set.

Goals & PR Tracking Set strength goals for any exercise and track your progress toward them. The app highlights personal records and celebrates when you hit a new PR.

Progress Charts Visualize your strength gains over time with interactive charts for every exercise. See trends, identify plateaus, and track your journey from Beginner to Elite.

Share Cards Generate beautiful rank cards sized for Instagram Stories or square posts. Show off your 1RM, strength rank, and percentile with a single tap.

Apple Watch App Log sets, view PRs, and run rest timers directly from your wrist. Syncs automatically with your iPhone.

Smart Notifications Get reminders when you haven't trained in a while, celebrations when you set a PR, and nudges when you're close to a goal all configurable.

BUILT FOR LIFTERS

• 100% offline no account needed, no data leaves your device
• Dark mode design optimized for gym use
• Haptic feedback on key actions
• Supports both kg and lbs
• Universal app: iPhone and iPad
• No subscription required to use the core calculator

Whether you're a beginner wondering how your bench press stacks up, or an advanced lifter chasing Elite status on your deadlift MaxOut gives you the tools to measure, track, and share your strength.

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Download now and find out how strong you really are.