One Rep Max Calculator — 3 Formulas + % Table — Free Online Calculator
Calculate your one rep max using Epley, Brzycki, and Lombardi formulas. Includes auto-generated 50–100% percentage breakdown table for barbell training.
✓ Formula verified: January 2026For informational purposes only
Goal
1RM Calculator
Results below
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Estimated 1 Rep Max (Epley)
263 lbs
Calculated From
225 lbs × 5 reps
Epley Formula
▲ 263 lbs
Brzycki Formula
253 lbs
Lombardi Formula
264 lbs
Percentage Breakdown Available
11 loading percentages (100% down to 50%)
What if your weight lifted changes? 202.5 lbs → 236 lbs · 225 lbs → 263 lbs · 247.5 lbs → 289 lbs
Scenario Comparison
Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Percentage Breakdown & Formula Comparison
225 lbs × 5 reps
263 lbs
Estimated 1 Rep Max
Formula Comparison
EpleySelected
263
Brzycki
253
Lombardi
264
| % of 1RM | Weight | Training Zone |
|---|---|---|
| 100% | 263 lbs | Max Effort |
| 95% | 250 lbs | Max Effort |
| 90% | 237 lbs | Strength |
| 85% | 224 lbs | Strength |
| 80% | 210 lbs | Hypertrophy |
| 75% | 197 lbs | Hypertrophy |
| 70% | 184 lbs | Hypertrophy |
| 65% | 171 lbs | Hypertrophy |
| 60% | 158 lbs | Power / Recovery |
| 55% | 145 lbs | Power / Recovery |
| 50% | 132 lbs | Power / Recovery |
Training Zone Guide
93%+ Max Effort (1–3 reps)
85–93% Strength (3–5 reps)
65–85% Hypertrophy (6–12 reps)
50–65% Power/Recovery
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