One Rep Max (1RM) Calculator
Health & FitnessEstimate your one-rep max (1RM) for any lift using the Epley formula or the NSCA Training Load Chart, plus your training percentages.
Estimated 1 Rep Max
Your estimated max weight for a single repetition, using the selected calculation method.
90% of 1RM (Power)
194.3
90% of your 1RM, a common load for power-focused training (1-3 reps).
80% of 1RM (Strength)
172.7
80% of your 1RM, typical for strength-focused training (4-6 reps).
70% of 1RM (Hypertrophy)
151.1
70% of your 1RM, typical for hypertrophy/muscle-building training (8-12 reps).
60% of 1RM (Endurance)
129.5
60% of your 1RM, typical for muscular endurance training (12+ reps).
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Odeh AhwalBased on 2 sources
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SponsoredYour one rep max, or 1RM, is the heaviest weight you can lift for a single complete repetition of an exercise with good form. Since testing it directly by working up to true failure carries real injury risk, this calculator estimates it instead, from a lighter set you already completed, using either the Epley formula or the NSCA Training Load Chart.
Enter the weight you lifted and how many reps you completed, and the calculator estimates your 1RM along with four common training percentages, covering everything from muscular endurance up through power work. The same formula works for any barbell or dumbbell lift, bench press, squat, deadlift, or otherwise, though your actual max still varies by exercise since different lifts recruit different muscle groups.
Formula based estimates are most accurate at lower rep counts, generally 1 to 10 reps, and become less reliable the higher the rep count climbs, since fatigue affects each lifter differently past that range. If you completed more than 10 reps, treat the result as a rough ballpark rather than a precise number.
This is an estimate, not a guarantee. If you want to confirm your true 1RM, work up to it gradually with a spotter and proper warm up sets rather than jumping straight to the calculated number.
Training Percentages: What to Lift for Your Goal
Different training goals call for different percentages of your one rep max. Lifting closer to your 1RM builds raw strength and power in low rep ranges, while lighter loads for more reps target muscle growth or muscular endurance. The table below shows the general ranges most strength coaches use.
| Training Zone | Percent of 1RM | Typical Reps |
|---|---|---|
| Power | 85-95% | 1-3 reps |
| Strength | 75-85% | 4-6 reps |
| Hypertrophy (muscle growth) | 65-75% | 8-12 reps |
| Muscular Endurance | 50-65% | 12+ reps |
The four percentage results above the fold, 90%, 80%, 70%, and 60% of your 1RM, give you a real working weight for each zone based on your own numbers, rather than a generic range you would have to calculate by hand.
One Rep Max by Lift: Bench Press, Squat, and Deadlift
This calculator works the same way for any exercise. Enter the weight and reps for the specific lift you want, bench press, squat, deadlift, overhead press, or anything else, and the calculator estimates the one rep max for that exact lift. Do not apply a max from one exercise to another, since different lifts recruit very different muscle groups and your true max will differ across all of them.
Bench Press
Bench press is the most commonly tested upper body lift. For the most reliable estimate, use a set you completed with proper form and a controlled bar path, ideally in the 3-8 rep range, and add a spotter for any attempt near your actual max.
Squat
Squat max is typically higher than bench press for the same lifter, since it recruits larger lower body muscle groups. Formula based estimates tend to be slightly less precise for squat than for bench, so treat the result as a solid starting point rather than an exact number, especially at higher rep counts.
Deadlift
Deadlift usually produces the highest 1RM of the three major lifts. Because deadlift sets are especially fatiguing, a lower rep test set, ideally under 6 reps, tends to give a more reliable 1RM estimate than a higher rep set for this specific lift.
Strength Standards: How Do You Compare?
Strength standards give you a general sense of where your 1RM falls compared to other lifters. The ranges below, adapted from strength assessment guidance published by NASM for an average adult male, are general benchmarks, not a precise ranking, since real strength varies by bodyweight, training history, age, and sex.
| Experience Level | Bench Press | Squat | Deadlift |
|---|---|---|---|
| Beginner | 90-155 lb | 110-185 lb | 130-220 lb |
| Intermediate | 155-220 lb | 185-275 lb | 220-310 lb |
| Advanced | 220-285 lb | 275-375 lb | 310-395 lb |
| Elite | 285+ lb | 375+ lb | 395+ lb |
Epley vs. NSCA: Which Formula Should You Use?
The Epley formula is a continuous equation, so it scales smoothly for any rep count. The NSCA Training Load Chart is a published lookup table instead, built from real training data rather than a single algebraic curve. Both are widely used, and they return nearly identical results in the 1-10 rep range where formula based 1RM estimation is most reliable, as the table below shows.
| Reps | Epley Estimate (% of 1RM) | NSCA Estimate (% of 1RM) |
|---|---|---|
| 1 | 96.8% | 100% |
| 3 | 90.9% | 93% |
| 5 | 85.7% | 87% |
| 8 | 78.9% | 80% |
| 10 | 75.0% | 75% |
| 12 | 71.4% | 70% |
Other named formulas exist too, most commonly Brzycki and Lombardi, which use their own separate equations and can return slightly different results from either method above. No single formula is universally more accurate. All of them are estimates built from population averages, and your own true 1RM may land a bit above or below any of them.
More Strength and Fitness Calculators
These related tools help round out your strength training and fitness testing:
- Wilks Score Calculator - compare your total lifts across bodyweight and sex
- VO2 Max Calculator - estimate your aerobic fitness level
- Heart Rate Zones Calculator - find your training heart rate zones
- Karvonen Formula Calculator - a more personalized heart rate zone method
- Macro Calculator - plan your nutrition to support strength training goals
Frequently Asked Questions
How accurate is this one rep max calculator?
Formula based 1RM estimates are generally reliable within about 10% of your true max when based on a set of 1-10 reps performed with proper form. Accuracy drops the higher the rep count climbs, since fatigue affects the relationship between reps and max strength differently for each lifter.
Should I actually attempt my calculated 1RM?
Not directly. This is an estimate, not a guarantee. If you want to test your true 1RM safely, work up gradually with a spotter and proper warm up sets rather than jumping straight to the calculated number.
Why use percentage-based training zones?
Training at specific percentages of your 1RM lets you target different goals. Higher percentages, roughly 85% and above, build strength and power, while moderate percentages around 65-75% are typically used for muscle growth, and lighter loads below that build muscular endurance.
What is the difference between the Epley and NSCA formulas?
The Epley formula is a continuous algebraic equation that scales for any rep count. The NSCA Training Load Chart is a published lookup table based on real training data instead of a formula. Both return nearly identical results in the 1-10 rep range, and diverge more at higher rep counts.
What about the Brzycki or Lombardi formulas?
Brzycki and Lombardi are two other commonly cited 1RM formulas, each using their own separate equation. This calculator does not currently offer them as selectable options, but none of the major formulas, including Epley and NSCA, is universally more accurate than the others, since all are built from population averages rather than your own individual data.
What is RPE and how does it relate to 1RM?
RPE, or rate of perceived exertion, is a 1-10 scale lifters use to rate how hard a set felt, often as an alternative way to estimate how close a set was to failure. It is a genuinely different method from the reps-based approach used here, since it relies on a subjective effort rating rather than a rep count alone.
How often should I test or recalculate my one rep max?
Most lifters retest every 4-8 weeks, since frequent maximal or near maximal testing adds real fatigue and injury risk without much added benefit. Recalculating from a recent hard set, rather than a true max attempt, is a lower risk way to update your estimate more often.
How much should my one rep max be?
There is no single number everyone should hit. Your 1RM depends on your bodyweight, training history, age, sex, and the specific lift, so the strength standards table above is a general reference point, not a target everyone should aim for equally.
Does the same formula work for bench, squat, and deadlift?
Yes, the same calculation applies to any lift. Enter the weight and reps for that specific exercise rather than reusing a number from a different lift, since your true max varies meaningfully between bench press, squat, deadlift, and other exercises.
Sources
- Training Load Chart, National Strength and Conditioning Association (NSCA)
- One Rep (1RM) Calculator, National Academy of Sports Medicine (NASM)
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