1RM & Strength Calculators

Estimate your one rep max for bench press, squat, deadlift, and overhead press — no max-out required.

1RM Calculator Estimate your one-rep max from any weight and rep count. Bench Press Max Calculator Estimate your max bench press from weight and reps. Squat Max Calculator Estimate your max squat from weight and reps. Deadlift Max Calculator Estimate your max deadlift from weight and reps. Overhead Press Max Calculator Estimate your strict press or military press max from weight and reps. Rep Max Calculator Convert a known weight and reps to any target rep count. 1RM Percentage Calculator Find your weight at any training percentage, or reverse-calculate your 1RM. Strength Standards Calculator Compare your bench, squat, deadlift, or OHP 1RM with bodyweight-based reference standards.

What Is a One Rep Max?

Your one rep max (1RM) is the heaviest weight you can lift for a single repetition with proper form. It's the reference number behind percentage-based strength programs, and it's used to set training loads, track progress, and compare performance across lifts.

Testing a true 1RM is fatiguing and carries injury risk. A 1RM calculator estimates it from a lighter set using established formulas — Epley, Brzycki, Lander, and Lombardi — so you can get a useful working number without maxing out every session.

Why Track Your Strength Metrics?

Progressive overload depends on knowing your numbers. Without a reference 1RM, it's hard to program training intensity — you end up guessing at weights, progressing unevenly, or leaving strength on the table. An estimated 1RM gives you a working number to plan percentages, compare sessions, and track long-term progress.

Tracking 1RM also helps you spot plateaus early. If your bench 1RM hasn't moved in 8 weeks but your squat is climbing, that's a signal to adjust bench volume, frequency, or technique work — instead of waiting until a competition or test day to discover the stall.

1RM Calculator by Lift

Different lifts benefit from different rep ranges for accurate 1RM estimation. While the general 1RM Calculator works for any exercise, the lift-specific tools account for common differences in technique and rep-range accuracy:

Bench Press Max Calculator — for pressed movements, the Epley formula tends to be most consistent in the 3–8 rep range
Squat Max Calculator — squats often produce slightly lower estimated 1RMs due to technical breakdown at high reps
Deadlift Max Calculator — deadlift 1RM estimation is typically most reliable under 5 reps
Overhead Press Max Calculator — OHP estimation works well at lower reps due to high technical demand

1RM Percentage Chart & Training Zones

Once you know your estimated 1RM, a percentage chart converts it into training loads. The most common zones:

90–100% of 1RM — maximal strength, 1–3 reps per set
80–85% of 1RM — strength focus, 4–6 reps
70–75% of 1RM — hypertrophy and volume work, 8–12 reps
60–65% of 1RM — technique work, 12+ reps

Use the 1RM Percentage Calculator to generate a full percentage table, or the Training Max Calculator to set a sustainable working max for 5/3/1 programming.

1RM vs Rep Max vs Training Max

Three related numbers often get confused:

1RM (one rep max) — your absolute maximum for one rep. Used as the reference for percentage-based training.
Rep max (RM) — the weight you can lift for a specific rep count (5RM, 8RM, 10RM, etc.). The Rep Max Calculator converts between rep targets.
Training max (TM) — typically 85–90% of 1RM, used in programs like 5/3/1 to keep working sets sustainable.

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