Calculator Inputs
Use the grid below on large, medium, and mobile screens.
Example Data Table
| Lifted weight | Reps | Formula | Estimated 1RM | Rounded 85% load |
|---|---|---|---|---|
| 140 kg | 3 | Epley | 154.00 kg | 130.00 kg |
| 160 kg | 5 | Average | 185.86 kg | 157.50 kg |
| 315 lb | 4 | Wathan | 353.89 lb | 300.00 lb |
Formula Used
1RM = Weight × (1 + Reps ÷ 30)1RM = Weight × 36 ÷ (37 − Reps)1RM = Weight × Reps^0.101RM = 100 × Weight ÷ (52.2 + 41.9 × e^(−0.055 × Reps))1RM = Weight × (1 + 0.025 × Reps)1RM = 100 × Weight ÷ (48.8 + 53.8 × e^(−0.075 × Reps))The calculator computes each estimate, then shows either your chosen formula or the blended average as the main result.
Projected rep maxes use an inverse Epley style approach. Training loads use the selected 1RM across percentage steps.
How to Use This Calculator
- Enter the heaviest deadlift set you completed with good form.
- Add the exact number of reps from that set.
- Select kilograms or pounds to match your plates.
- Optionally enter bodyweight to see your strength ratio.
- Choose the formula you want for the headline estimate.
- Pick a rounding option for practical gym loading.
- Submit the form to view the max estimate, graphs, and training tables.
- Download the result as CSV or PDF when needed.
Frequently Asked Questions
1. Which formula should I trust most?
There is no perfect formula for every lifter. Epley and Brzycki are common starting points. The average option is useful when you want a balanced estimate instead of relying on one model.
2. What rep range works best for estimating a deadlift max?
Most estimators are more reliable when the set is between 1 and 10 reps. Accuracy usually drops when fatigue becomes a major factor in very high rep sets.
3. Can I use this for sumo and conventional deadlifts?
Yes. The math estimates one rep max from load and reps only. Use the same stance and technique style when comparing different sessions for cleaner progress tracking.
4. Why does bodyweight matter here?
Bodyweight is optional. It helps create a strength ratio, which lets you compare your estimated max with your size. That ratio is useful when tracking relative strength over time.
5. Why do rounded loads look different from raw values?
Gyms usually load bars with practical plate jumps. Rounding lets your working sets match real plates. The raw estimate is still kept internally for more precise percentage calculations.
6. What does the percentage table help with?
It converts your estimated max into usable training loads. That makes it easier to plan volume work, heavy singles, warm ups, and weekly progression without recalculating every set manually.
7. Can I export results for coaching logs?
Yes. The CSV export is useful for spreadsheets. The PDF export is useful for sharing, printing, or saving session snapshots with formula comparisons and training tables.
8. Is this a substitute for testing a real one rep max?
No. It is an estimate, not a guaranteed performance. Use it for planning and trend tracking. Test true max attempts only when recovery, technique, and safety conditions are solid.