Advanced Bench Press 1RM Calculator

Bench press 1RM calculator

Lifted weight

Completed reps

Unit

Bodyweight

Gender standard

Primary formula

Round to increment

Training max %

Target working load %

Tip: Estimates are strongest when the set is technically clean and not heavily assisted. For bench press, sets between 1 and 10 reps usually give the best practical results.

Example data table

Lifter	Weight lifted	Reps	Method	Estimated 1RM
Athlete A	80 kg	8	Epley	101.50 kg
Athlete B	225 lb	5	Brzycki	253.00 lb
Athlete C	95 kg	3	Average	104.50 kg
Athlete D	135 lb	10	Lander	179.00 lb

Formula used

This calculator compares several popular one rep max equations because no single formula fits every athlete perfectly. Bench press estimates often shift with training age, bar speed, fatigue, and repetition range.

Epley: 1RM = weight × (1 + reps / 30)
Brzycki: 1RM = weight × 36 / (37 − reps)
Lombardi: 1RM = weight × reps^0.10
O'Conner: 1RM = weight × (1 + reps / 40)
Mayhew: 1RM = 100 × weight / (52.2 + 41.9 × e^{−0.055×reps})
Wathan: 1RM = 100 × weight / (48.8 + 53.8 × e^{−0.075×reps})
Lander: 1RM = 100 × weight / (101.3 − 2.67123 × reps)

The selected result can use one formula or the average of all formulas. The training max is usually set below the estimated maximum to support steady progress and cleaner programming.

How to use this calculator

Enter the heaviest bench press weight you completed with good form.
Enter the number of full repetitions you performed.
Select kilograms or pounds.
Optionally add bodyweight and gender standard for ratio-based classification.
Choose a primary formula or keep the average option.
Set the rounding increment and training percentages.
Press Estimate 1RM to show results above the form.
Review the formula table, load chart, and warm-up suggestions.
Use the export buttons to save results as CSV or PDF.

FAQs

1. Is a calculated 1RM as accurate as a true max test?

No. A calculated 1RM is an estimate based on submaximal effort. It is safer and faster than frequent max testing, but bar path, fatigue, range of motion, and spotting quality still affect the result.

2. Which formula should I trust most?

Most lifters start with the average or Epley. If your bench work usually happens in moderate rep ranges, the average view can smooth out formula-specific bias and give a more stable planning number.

3. What rep range works best for estimation?

Sets from 1 to 10 reps are usually the most practical. Estimates can still work up to 15 reps, but the farther you move from low-rep work, the more uncertainty enters the prediction.

4. Why use a training max?

A training max gives you a more conservative number for programming. That helps manage fatigue, keep technique tighter, and leave room for progression instead of chasing inflated percentages.

5. Should I round to the nearest 2.5 or 5?

Use the smallest practical plate jump you can load consistently. Smaller jumps improve progression precision, while larger jumps may suit gyms with limited plates or faster session setup.

6. Does bodyweight matter for bench press analysis?

Yes. Comparing 1RM to bodyweight helps you judge relative strength, not just absolute load. That makes progress easier to interpret across athletes of different sizes.

7. Can beginners use this calculator?

Yes, but newer lifters should treat the result as a guide, not a challenge target. Technical consistency improves estimate quality, so prioritize controlled reps and proper spotting.

8. When should I recalculate my 1RM?

Recalculate after a meaningful performance change, such as improved reps at the same load or a new top set. Every few weeks works well for most bench-focused programs.