1RM Strength Matrix
Epley + Brzycki estimates with bodyweight ratio & strength rating.
Estimated 1RM (avg)
116.3 kg
Epley Formula
116.7 kg
Brzycki Formula
115.6 kg
vs Bodyweight
1.45× BW
Strength Scale (vs bodyweight)
1× Beginner1.5× Intermediate2× Elite
Most accurate under 6 reps. Use test-day values, not fatigued sets.
Did you know?
The world record deadlift is 501 kg by Hafþór Júlíus Björnsson — over 4× the bodyweight of many heavyweight lifters.
Formula
Epley: 1RM = W × (1 + Reps/30) · Brzycki: 1RM = W × 36/(37 − Reps)
FAQs
How accurate are these?
Both formulas are most accurate for sets under 6 reps; averaging them reduces error.