One-Rep Max (1RM) Calculator
Estimate your one-repetition maximum (1RM) and calculate training weight percentages based on multiple formulas.
Real-time Results
Estimated One-Rep Max
Percentage of 1RM lifted during set
Formula Comparison
1RM estimates derived from alternative calculations
| Item | Value |
|---|---|
| Epley Formula | 116.7 kg |
| Brzycki Formula | 112.5 kg |
| Lander Formula | 113.7 kg |
| O\ | 112.5 kg |
| Lombardi Formula | 117.5 kg |
Training Intensities Table
Recommended weights and repetition limits for target training percentages
View details (9)
| Item | Value |
|---|---|
| 95% 1RM results.intensity_table.values.reps_2 | 110.8 kg |
| 90% 1RM results.intensity_table.values.reps_3_4 | 105.0 kg |
| 85% 1RM results.intensity_table.values.reps_5_6 | 99.2 kg |
| 80% 1RM results.intensity_table.values.reps_7_8 | 93.3 kg |
| 75% 1RM results.intensity_table.values.reps_9_10 | 87.5 kg |
| 70% 1RM results.intensity_table.values.reps_11_12 | 81.7 kg |
| 65% 1RM results.intensity_table.values.reps_15 | 75.8 kg |
| 60% 1RM results.intensity_table.values.reps_20 | 70.0 kg |
| 50% 1RM results.intensity_table.values.reps_25 | 58.3 kg |
Disclaimer
The data provided by this health calculator is for reference only and cannot replace professional medical diagnosis, consultation, or treatment. Please consult a doctor before making any changes to your fitness or diet plan.
Supported inputs
| Input | Description |
|---|---|
| Weight Lifted | The resistance used for the exercise |
| Weight Unit | Unit of measurement for weight kg · lbs |
| Repetitions | Formulas are most accurate under 10-12 reps |
| Calculation Formula | Formula used to estimate 1RM epley · brzycki · lander · oconner · lombardi |
Formula
One-Rep Max (1RM) Formulas: 1. Epley Formula: 1RM = w × (1 + r / 30) 2. Brzycki Formula: 1RM = w × (36 / (37 - r)) 3. Lander Formula: 1RM = (100 × w) / (101.3 - 2.67123 × r) 4. O'Conner Formula: 1RM = w × (1 + 0.025 × r) 5. Lombardi Formula: 1RM = w × r^0.1 * w = weight lifted, r = repetitions completed. Most formulas are validated for r ≤ 10.
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