🏋 One Rep Max (1RM) Calculator
Estimate your maximum strength for any lift using proven formulas — Epley, Brzycki & more
| Training Goal | % of 1RM | Rep Range | Sets | Rest Period |
|---|---|---|---|---|
| Maximal Strength | 90–100% | 1–3 | 3–5 | 3–5 min |
| Strength | 80–90% | 3–5 | 3–5 | 2–4 min |
| Strength-Hypertrophy | 75–85% | 5–8 | 3–5 | 2–3 min |
| Hypertrophy (Muscle Growth) | 67–85% | 6–12 | 3–4 | 60–90 sec |
| Muscular Endurance | 50–67% | 12–20 | 2–3 | 30–60 sec |
| Power / Speed-Strength | 55–80% | 3–6 | 3–6 | 2–5 min |
| Warm-Up / Activation | 40–60% | 10–15 | 2–3 | 60–90 sec |
| Exercise | Gender | Beginner | Intermediate | Advanced | Elite |
|---|---|---|---|---|---|
| Bench Press | Male | 0.5x BW | 1.0x BW | 1.5x BW | 2.0x BW |
| Bench Press | Female | 0.35x BW | 0.65x BW | 1.0x BW | 1.35x BW |
| Back Squat | Male | 0.75x BW | 1.25x BW | 1.75x BW | 2.5x BW |
| Back Squat | Female | 0.5x BW | 0.85x BW | 1.25x BW | 1.75x BW |
| Deadlift | Male | 1.0x BW | 1.5x BW | 2.0x BW | 2.75x BW |
| Deadlift | Female | 0.65x BW | 1.0x BW | 1.5x BW | 2.0x BW |
| Overhead Press | Male | 0.35x BW | 0.65x BW | 1.0x BW | 1.35x BW |
| Overhead Press | Female | 0.2x BW | 0.4x BW | 0.65x BW | 0.85x BW |
| Barbell Row | Male | 0.5x BW | 0.9x BW | 1.25x BW | 1.6x BW |
| Barbell Row | Female | 0.3x BW | 0.55x BW | 0.85x BW | 1.1x BW |
| Formula | Best For | Accuracy Range | Notes |
|---|---|---|---|
| Epley (1985) | General use | 1–10 reps | Most widely used formula worldwide |
| Brzycki (1993) | Low rep sets | 2–10 reps | Most accurate for 5 reps or fewer |
| Lander (1985) | Higher reps | 1–12 reps | Good balance across rep ranges |
| Lombardi (1989) | High reps | 5–15 reps | Tends to overestimate slightly |
| Mayhew et al. | Bench press | 6–20 reps | Validated for bench press specifically |
| O'Conner et al. | General use | 1–15 reps | Simple, slight underestimation tendency |
Your One Rep Max. Or 1RM, as lifters call it, is simply the most weight you can lift in one single move with good technique. That marks the upper limit for any exercise: squats, bench press, deadlifts, whatever you do. Knowing that helps to set your whole plan for strength training.
DISCLOSURE: This post may contain affiliate links, meaning when you click the links and make a purchase, I receive a commission. As an Amazon Associate I earn from qualifying purchases.
There is a clear difference between simply lifting heavy weight once and truly reaching your actual One Rep Max. True maximum attempts require everything from you physically and mentally. It is that weight that even with adding one pound or two causes failure. That is the main difference.
One Rep Max: What It Is and How to Test It Safely
Most lifters agree on testing One Rep Max for basic barbell moves; deadlifts, bench press, squats. Instead of for isolation exercises like bicep curls. That works well as a reference, letting you track if your upper body, lower body or the whole body truly grows in strenght.
But here is the problem: always testing your real maximum is not wise. Your central nerves need around two to three weeks to recover after a max attempt, and your tendons? They maybe need even up to six weeks to fully heal, if they suffered.
First build a strong base, later test when you truly feel ready and fresh. Also, trying actual maximum brings real risk of injury compared too other methods of training.
The info below is not from the calculator.
If you do not want to risk that, a calculator for One Rep Max offers a reliable choice. Those tools use math to guess your max based on the number of reps that you can do with lighter weight. The best accuracy comes for reps between one and ten.
Sets with few reps and high levels of effort usually give more reliable guesses. Different formulas exist (Wathan), Pawn, Mayhew. And they do not always agree.
More important than finding the “ideal” formula is sticking to one of them always.
Other way? Just find your max for three or four reps and use that as your base instead of going always to full One Rep Max. That someone watches you during the attempt is really important, any way you choose.
Before trying something, warm up well. Do five to ten reps at around half of your hoped max, then three to five reps at about 70%, and finish with one or two at 85-90% of effort. Pause between two and five minutes before the real test, so that your muscles recover right.
Mind that number going up? That is the key. It shows that your efforts truly bring results.
For real strength, keep reps under six, pause three to five minutes between sets and work with weights around 85% of yourOne Rep Max. Training only with light weights and many reps will not build the strength that you need to reach those valued maxes.
