Bench Press One-Rep Max Calculator
The Brzycki formula converts a submaximal bench press effort — a weight lifted for multiple reps — into an estimated one-rep maximum. This lets you set training percentages and track strength progress without the injury risk of attempting true maximum lifts every session.
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Formula
1RM = Weight / (1.0278 − 0.0278 × Reps)
The Brzycki formula was developed by Matt Brzycki and is most accurate for rep ranges of 1–10. The denominator decreases as reps increase, reflecting the greater energy cost of higher-rep sets relative to true maximum effort. At 10 reps the formula tends to underestimate the true 1RM slightly; at 1–5 reps it is very accurate. Always use the result as an estimate, not a guarantee.
How to use the Bench Press One-Rep Max Calculator
- 1
Enter your weight lifted
Value should be in lbs.
- 2
Enter your reps completed
Value should be in reps.
- 3
Read your results instantly
Results update in real time as you type.
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Using your 1RM to program training
Once you have an estimated one-rep max, you can set precise training loads for different goals. Strength training (1–5 reps) typically uses 85–100% of 1RM. Hypertrophy (muscle building) is most effective in the 65–85% range for 6–12 reps. Muscular endurance work uses loads below 65% for 15+ reps. These percentages translate your abstract 1RM into specific plate-loading targets. For example, if your bench press 1RM is 225 lbs, a hypertrophy set would use 145–190 lbs. Periodized programs cycle through these ranges over weeks or months to drive continuous adaptation.
Why you shouldn't max out every session
True one-rep maximum attempts are neuromuscularly and mechanically demanding. They require extensive warm-up, a spotter, and significant recovery time. Frequent maximum attempts also increase injury risk — the spine, shoulders, and wrists are under peak load with no room for technical breakdown. Submaximal testing with the Brzycki formula lets you track strength progress safely. Test a near-max set of 3–5 reps every 4–6 weeks and use the formula to project your 1RM. If your 5-rep max weight increases by 10 lbs, your 1RM has improved by roughly 12 lbs — measurable progress without the risk.
Tips & Insights
Test with 3–5 reps for best accuracy
The Brzycki formula is most reliable in the 3–5 rep range. Testing with 8–12 reps introduces more estimation error as accumulated fatigue affects the result.
Always use a spotter
Even submaximal heavy sets on the bench press require a spotter. A failed rep without a safety catch can cause serious injury.
Log your test sets over time
Track the date, weight, and reps of each test set so you can trend your estimated 1RM over weeks and months — this reveals whether your program is producing strength gains.
Worked Examples
185 lbs for 8 reps
Estimated 1RM: ~236 lbs; 90%: ~212 lbs; 80%: ~189 lbs
135 lbs for 5 reps
Estimated 1RM: ~152 lbs; 90%: ~137 lbs; 80%: ~122 lbs
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Frequently Asked Questions
Which 1RM formula is most accurate?
Epley and Brzycki formulas perform similarly for most people. Brzycki tends to be slightly more conservative at high rep counts. For rep ranges of 1–5, most formulas agree within a few pounds.
Can I use this formula for other lifts?
Yes — the Brzycki formula applies to any barbell or machine lift. It is commonly used for squat, deadlift, overhead press, and row in addition to bench press.
How often should I test my 1RM?
Testing every 4–8 weeks is common in powerlifting programs. In general strength training, you can track progress indirectly by noting improvements in your submaximal working sets without formal testing.
What is a good bench press 1RM?
For men, benching your own bodyweight is a common beginner milestone; 1.5× bodyweight is intermediate; 2× bodyweight is advanced. For women, 0.75× bodyweight is beginner; 1.25× is advanced.
Does this account for pause reps or touch-and-go?
No — touch-and-go reps (bouncing off the chest) allow slightly more weight than a controlled pause at the chest. Powerlifting 1RM standards require a pause; most gym lifters use touch-and-go, which may slightly overestimate a competition-legal 1RM.
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