Calculator inputs
Use one strong work set or enter up to three sets. The page stays single column, while the input area adapts to large, medium, and mobile screens.
Example data table
| Athlete | Weight Used | Reps | Method | Estimated 1RM |
|---|---|---|---|---|
| Athlete A | 90 kg | 3 | Average of all formulas | 97.71 kg |
| Athlete B | 102.5 kg | 2 | Epley | 109.33 kg |
| Athlete C | 185 lb | 4 | Brzycki | 200.32 lb |
Formula used
This calculator supports several common 1RM estimators. When you choose the average option, it averages all valid formula outputs for the entered set.
| Formula | Expression |
|---|---|
| Epley | 1RM = weight × (1 + reps ÷ 30) |
| Brzycki | 1RM = weight × 36 ÷ (37 − reps) |
| O'Conner | 1RM = weight × (1 + 0.025 × reps) |
| Lombardi | 1RM = weight × reps0.10 |
| Mayhew | 1RM = 100 × weight ÷ (52.2 + 41.9 × e−0.055 × reps) |
| Wathan | 1RM = 100 × weight ÷ (48.8 + 53.8 × e−0.075 × reps) |
Olympic lift estimates work best from crisp, non-grindy sets. Very high reps usually reduce reliability because power cleans are limited more by technique and speed.
How to use this calculator
- Select your preferred unit and formula.
- Enter bodyweight if you want a relative strength score.
- Add one to three recent power clean work sets.
- Choose a training max percentage and barbell rounding increment.
- Set the chart range for your percentage load table.
- Press the calculate button to show results above the form.
- Review the set table, formula comparison, and training graph.
- Export the results to CSV or PDF when needed.
FAQs
1. Is a power clean 1RM estimate exact?
No. It is a planning estimate based on reps and load. Technique, fatigue, speed under the bar, and catch quality all affect real Olympic lifting performance.
2. Which formula should I use?
Use the average option if you want a balanced estimate. Choose a single formula if your coach or program already relies on one method for tracking.
3. Are high rep power clean sets reliable for 1RM prediction?
Usually less reliable. Power cleans are technical and explosive. Sets from one to five quality reps often provide more useful estimates than long, fatiguing sets.
4. What is a training max?
A training max is a reduced percentage of your estimated top lift, often 85% to 95%. It helps manage fatigue and keeps working loads practical.
5. Why add bodyweight?
Bodyweight lets the calculator show relative strength. That makes comparisons more useful across athletes in different size classes or training phases.
6. Should I round to 2.5 or 5?
Pick the smallest realistic jump your gym allows. Olympic plates often make 0.5, 1, or 2.5 unit jumps possible, which keeps programming cleaner.
7. Can I use this for hang cleans or clean pulls?
You can, but the estimate is most appropriate for the lift you actually performed. Different clean variations usually produce different rep relationships and limits.
8. Why compare several formulas?
Formula comparison shows how sensitive your estimate is. If the numbers cluster closely, confidence is better. Large spread suggests caution and more testing.