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Bench Press Calculator
Our free bench press calculator estimates your one-rep max (1RM) from a set you have already lifted. Enter the weight on the bar and how many reps you did, and it works out your estimated max plus the training weights to use for strength and muscle building.
Most accurate at 10 reps or fewer.
| 90% of 1RM — strength (3–5 reps) | |
| 80% of 1RM — strength / muscle | |
| 70% of 1RM — muscle (8–12 reps) | |
| 60% of 1RM — warm-up / volume |
How it works
Your one-rep max, or 1RM, is the heaviest weight you can bench press once with good form. Testing a true max is risky and tiring, so lifters usually estimate it from a lighter set they can already do. This calculator uses the Epley formula, the most widely used estimate in gyms and training programs across the United States. It assumes each extra rep you can do means your true max is a little higher than the weight in your hands.
Enter the weight you lifted, including the bar. A standard Olympic barbell weighs 45 pounds, so 185 pounds usually means the 45 pound bar plus 140 pounds of plates. Enter the number of reps you completed with good form, stopping when you could not do another clean rep. Choose pounds or kilograms; the formula works the same in either unit, and the answer comes back in the unit you picked.
With the Epley formula, one rep gives a max equal to the weight itself, since 1 + 1/30 is about 1.03, which is close to the weight you just lifted once. Five reps adds about 17 percent, ten reps adds 33 percent, and fifteen reps adds 50 percent. The estimate is most reliable for sets of 10 reps or fewer. Past 10 reps, endurance starts to matter more than raw strength, and the formula tends to guess high, so treat high-rep estimates with caution.
The training table below your max turns the estimate into a workout plan. Strength programs usually work at 80 to 90 percent of your max for 3 to 6 reps, while muscle-building programs use 65 to 80 percent for 8 to 12 reps. Warm-up sets sit around 50 to 60 percent. These are starting points, not rules: if the bar moves slowly and your form breaks down, the weight is too heavy for that rep range, whatever the percentage says.
Worked example
Say you benched 185 pounds for 5 clean reps at your gym in California. Here is the math, step by step.
First, divide the reps by 30: 5 ÷ 30 = 0.167. Add 1: 1 + 0.167 = 1.167. Multiply by the weight: 185 × 1.167 = 215.83, which rounds to about 216 pounds. That is your estimated one-rep max. In practice you would not load 216 pounds and try it cold; you would work up to it with a spotter and safety bars.
From that 216 pound max, the training weights follow easily. Ninety percent is 216 × 0.90 = 194 pounds, a good weight for heavy sets of 3 to 5 reps. Eighty percent is 173 pounds, seventy percent is 151 pounds for sets of 8 to 12, and sixty percent is 130 pounds for warm-ups and higher-volume work. If you lift in kilograms, the same example is 84 kg for 5 reps, giving an estimated max of about 98 kg, since 84 × 1.167 = 98.
FAQ
What is a one-rep max (1RM)?
Your one-rep max is the heaviest weight you can lift for a single repetition with good form. It is the standard measure of maximal strength, and most training programs set working weights as a percentage of it.
How accurate is the Epley formula?
The Epley formula is most accurate for sets of 10 reps or fewer, usually within about 5 to 10 percent of a true tested max. Above 10 reps it tends to overestimate, because endurance plays a bigger role than strength.
What is a good bench press for a beginner?
A common beginner goal for an adult man is benching his own body weight for one rep, and for an adult woman about half to two-thirds of body weight. Progress varies a lot with body weight, training history, and age, so compare yourself to your past self first.
How do I use my 1RM to plan a workout?
Use about 70 to 80 percent of your 1RM for 8 to 12 reps to build muscle, and 80 to 90 percent for 3 to 6 reps to build strength. Warm up with light sets first and never test a true max alone without a spotter.
Should I test my real one-rep max?
You do not need to. An estimated max from a 3 to 5 rep set is safer and close enough for programming. If you do test a true max, use a spotter, safety bars, and a proper warm-up, and stop if your form breaks down.