Bench Press Percentile Calculator

A percentile shows how you compare to others. For example, being in the 70th percentile means you are stronger than 70% of people.

Bodyweight (lbs) Bench Press 1RM (lbs) Gender Male Female Calculate Percentile

Full Methodology

This calculator estimates bench press percentiles by modeling the entire adult population as a combination of lifters and non-lifters, then fitting a normal distribution to the resulting data.

1. Population Split

Based on CDC data:

• 35% of men lift weights regularly
• 25% of women lift weights regularly

2. Average Bench Press by Group

• Non-lifters: Men = 119 lbs, Women = 55 lbs
• Lifters: Men = 220 lbs, Women = 104 lbs

3. Weighted Population Average

Men: 119 × 0.65 + 220 × 0.35 = 155 lbs Women: 55 × 0.75 + 104 × 0.25 = 65 lbs

4. Average Bodyweight

• Men: 190 lbs
• Women: 160 lbs

5. Relative Strength (Lift ÷ Bodyweight)

Men: 155 / 190 = 0.82 Women: 65 / 160 = 0.41

6. Bodyweight Standard Deviation

Estimated from NHANES percentiles using:

SD ≈ (95th percentile − 5th percentile) / 3.29 Men: (284 − 136) / 3.29 ≈ 45 lbs Women: (263 − 110) / 3.29 ≈ 47 lbs

7. Non-Lifter Strength Variability

Men: 0.82 × 45 ≈ 37 lbs Women: 0.41 × 47 ≈ 19 lbs

8. Lifter Strength Variability

Derived from strength percentiles:

Men: (370 − 119) / 3.29 ≈ 75 lbs Women: (198 − 55) / 3.29 ≈ 43 lbs

9. Combined Standard Deviation

Men: 37 × 0.65 + 75 × 0.35 ≈ 50 lbs Women: 19 × 0.75 + 43 × 0.25 ≈ 25 lbs

10. Final Distributions

• Men: mean = 155 lbs, std dev = 50 lbs
• Women: mean = 65 lbs, std dev = 25 lbs

11. Relative Strength Distribution

Men: std = 50 / 190 ≈ 0.26 Women: std = 25 / 160 ≈ 0.16

12. Percentile Calculation

Percentiles are computed using a normal distribution:

z = (value − mean) / standard deviation percentile = CDF(z)

Sources

• StrengthLog Bench Press Standards
• CDC Strength Training Data
• NHANES Weight Percentiles