One Rep Max Calculator · Practical guide
Bench Press One Rep Max Calculator
Estimate your bench 1RM from any working set — no grinding singles required.
At a glance
Bench Press 1RM, Estimated Safely
Instead of loading plates until you grind out a shaky single, enter your best recent bench set — weight and reps — above. The calculator projects your bench one-rep max with four proven formulas and builds a training-load table off the average.
Interactive tool
One Rep Max Calculator
Enter your own values, then compare the result with the examples below.
1RM Estimates
Percentage Table
| % of 1RM | Weight | Typical Use |
|---|
Example: 225 lbs for 3 Reps
Two plates per side for a triple is a classic checkpoint. The formulas estimate:
- Epley: 247.5 lbs
- Brzycki: 238.2 lbs
- Lombardi: 251.1 lbs
- Mayhew: 256.5 lbs
The average of 248 lbs means your bench max is most likely in the 240–255 range.
Training Weights Off a 248 lb Max
| % of 1RM | Bench Weight | Typical Use |
|---|---|---|
| 90% | 223 lbs | Strength |
| 85% | 211 lbs | Strength/Hypertrophy |
| 80% | 199 lbs | Hypertrophy |
| 75% | 186 lbs | Hypertrophy |
| 70% | 174 lbs | Endurance |
Bench-Specific Notes
Bench press estimates are among the most reliable because the lift is short-range and technique stays stable under fatigue. Retest with a heavy set of 3–5 every 4–8 weeks rather than attempting a true max — your shoulders will thank you.
Frequently Asked Questions
How accurate is a bench press 1RM estimate?
For sets of 1-10 reps, estimates typically land within about 5% of a true max. The bench press is one of the most predictable lifts because its short range of motion keeps technique stable under fatigue.
Can I estimate my bench max from a set of 10?
You can, but accuracy fades above 10 reps because muscular endurance starts to dominate. A heavy set of 3-5 gives a tighter estimate.
Why do the four formulas give different numbers?
Each formula models fatigue differently, so they diverge as reps climb. When all four cluster within a few pounds, the estimate is trustworthy; the average smooths out any single formula's bias.
Should I enter pounds or kilograms?
Either — the calculator works in both. Select your unit and the estimates and percentage table come back in the same unit.