1RM Percentage Calculator
Every training percentage of your one-rep max
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1RM Percentage Calculator
Most strength programs prescribe loads as a percentage of your one-rep max — 5×5 at 80%, a top single at 90%, back-off sets at 70%. Enter your 1RM and this calculator builds the full chart from 100% down to 50%, with the exact weight (rounded to real plate increments) and the typical reps at each percentage. Use it to set every working weight in a 5/3/1, percentage-based or linear program at a glance.
The rep ranges are a general guide; the reps you can actually do at each percentage vary by lift, training level and fatigue. Most programs prescribe work in the 70–90% range, with the lower end for volume and the higher end for strength.
Frequently Asked Questions
- What is a 1RM percentage calculator?
- It takes your one-rep max and builds a full chart of training loads, showing the weight and typical rep count at each percentage of your 1RM. This makes it easy to pick the right load for any training goal.
- How do I use the 1RM percentage chart?
- Enter your one-rep max in kg or lb, and the calculator lists weights from low to high percentages. Choose the percentage that matches your goal, then lift the corresponding weight for the suggested rep range.
- What percentage of 1RM should I lift?
- Maximal strength training typically uses 85 percent or more of 1RM for low reps, hypertrophy around 67 to 85 percent for moderate reps, and muscular endurance below about 67 percent for higher reps.