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1RM calculator
Press ＋ 2.5 kg or Epley and Brzycki. 100 kg for 5 reps is Epley 116.67 and Brzycki 112.50.
Change the weight you lifted and the reps. Press ＋ 2.5 kg or Epley and Brzycki and the 1RM below changes at once. 100 kg for 5 reps is Epley 116.67.
One-rep max · Epley
116.67
116.67 · 112.50 · 114.58
- Epley
- 116.67
- Brzycki
- 112.50
- Mean
- 114.58
| Percents | Weight |
|---|---|
| 100% | 116.67 |
| 90% | 105.00 |
| 80% | 93.33 |
| 70% | 81.67 |
| 60% | 70.00 |
Recent
Why this exists
The calorie calculator estimates a day’s energy, and BMI is a ratio of height and weight. This page estimates a one-rep max from a weight you lifted more than once.
Epley multiplies the weight by 1 plus reps divided by 30. 100 kg for 5 reps is 100 times 35/30, rounded in grams to 116.67. Brzycki is 36 divided by 37 minus the reps, which is 112.50, and the mean of the two is 114.58.
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01How to use it
Edit the weight and the reps, or press − 2.5 kg, ＋ 2.5 kg, − 1 rep, and ＋ 1 rep. Press Epley, Brzycki, or Mean and the large number switches to that formula, and a line says what the button just did.
The sample is 100 kg and 5 reps. The table is 100, 90, 80, 70, and 60 percent of the formula you picked. With Epley those are 105.00, 93.33, 81.67, and 70.00. Kilograms and pounds rerun the same number in the unit you picked. Copy takes that table.
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02What you get
The large number is 116.67. The line beside it shows Brzycki 112.50 and the mean 114.58 together.
One rep skips the formula and returns the weight itself, 100.00. Recent results stay in this browser.
Entered100 kg · 5 reps
Epley 116.67 Brzycki 112.50 Mean 114.58 1 rep 100.00 -
03Worth knowing
Reps run from 1 to 12. Above that the two formulas drift apart, so this page refuses them. A 1RM is an estimate, not a diagnosis.
The same 100 kg is 220.46 lb, and Epley is then 257.20 lb. The BMI calculator and the calorie calculator look at the whole body. This page only estimates one lift. Nothing is sent to a server.
Questions
- QWhat is 116.67?
- AThe Epley 1RM for 100 kg lifted 5 times.
- QWhat is 112.50?
- AThe Brzycki 1RM for that same set.
- QWhat is 114.58?
- AThe mean of those two results, taken in grams.
- QWhat is 105.00?
- A90 percent of the Epley 116.67.
How this page works it out
This page estimates a one-rep max from a weight lifted more than once. 100 kg for 5 reps is Epley 116.67, Brzycki 112.50, and a mean of 114.58. Of the Epley result, 90 percent is 105.00, 80 percent is 93.33, 70 percent is 81.67, and 60 percent is 70.00.
One rep stays the weight itself, 100.00. The same 100 kg is 220.46 lb, and Epley is then 257.20 lb. ＋ 2.5 kg, ＋ 1 rep, Epley, Brzycki, and Mean change the large number at once.
Reps run from 1 to 12. Above that the two formulas drift apart. This is an estimate, not a diagnosis. BMI and calories look at the whole body. This page only has one lift. Nothing is sent to a server.