Strength
How Many Sets and Reps
Updated 3 Nov 2026 · Source: ACSM position stand (2009) ↗
Enter your hard sets per muscle for the week, how many days you train that muscle, your reps per set and the weight. You get sets per session, weekly reps and weekly volume.
Worked example
- 12 sets ÷ 2 days = 6.0 per session
- 12 × 8 × 135 = 12,960 lb
Typical rep ranges and loads
| Main aim | Reps per set | Load (% of max) | Rest |
|---|---|---|---|
| Maximal strength | 1 to 6 | about 80 to 100% | 2 to 5 min |
| Muscle size | 6 to 12 | about 65 to 85% | 1 to 2 min |
| Muscular endurance | 15 or more | under about 65% | under 1 to 2 min |
| New lifters | 8 to 12 | about 60 to 70% | 1 to 2 min |
Broad ranges from published training guidance (see sources). Many programs mix them.
Start from your goal
Reps and load move together: the heavier the weight, the fewer reps you can do. So the first question is what you want most. The 2009 ACSM position stand on resistance training sets out these ranges for healthy adults:
- New and intermediate lifters building strength: about 60 to 70% of a one rep max for 8 to 12 reps, 1 to 3 sets per exercise.
- Advanced strength: loads of 80 to 100% of max, with an emphasis on heavy sets of 1 to 6 reps.
- Muscle size, new and intermediate: 70 to 85% of max, 8 to 12 reps, 1 to 3 sets.
- Muscle size, advanced: 3 to 6 sets, mostly in the 6 to 12 rep range.
- Muscular endurance: light loads for 10 to 15 reps, or 10 to 25 and more for advanced lifters.
Count sets per muscle, per week
Sets per exercise only tell part of the story. A bench press, a dip and an overhead press all work the triceps, so they add up. That is why the calculator asks for hard sets per muscle per week, meaning working sets taken reasonably close to failure, not warm-ups.
A 2017 analysis by Schoenfeld, Ogborn and Krieger pooled 15 studies. Each extra weekly set was linked to about 0.37% more muscle growth, and growth kept rising up to 10 or more weekly sets per muscle. The comparison between set groups was only a trend, so read it as a direction, not a target.
Spread the sets over the week
The example uses 12 weekly sets over 2 days, which is 6 sets per session. At 8 reps with 135 lb that comes to 96 reps and 12,960 lb of weekly volume for that muscle. Watching the volume number rise over months is one plain way to see that your training is moving.
For frequency, the 2009 stand suggests 2 to 3 whole-body days a week for new lifters, 3 to 4 for intermediate and 4 to 6 for advanced lifters.
The minimum that counts
The federal Physical Activity Guidelines for Americans ask adults to do muscle-strengthening activity, at moderate or greater effort and covering all major muscle groups, on 2 or more days a week. If two days is all your schedule allows, the 1 to 3 sets per exercise the 2009 stand gives new lifters fits well inside it.
Pick weights to match the reps
Once you know your rep range, the load follows. The rep max chart turns a one rep max into a weight for any number of reps, and rest between sets covers how long to pause. To keep the numbers climbing, add load or reps over time as shown in progressive overload.
Related pages
Rest Between Sets, One Rep Max Formula, Rep Max Chart, One Rep Max Calculator
Questions
Is 3 sets of 10 a good default?
It sits inside the 8 to 12 rep range the 2009 guidance gives new lifters for both strength and size, so it is a reasonable starting point.
Do more sets always mean more muscle?
The 2017 analysis found more weekly sets linked to more growth up to 10 or more per muscle. More is not free, though: recovery and time limit how much you can do well.
How many reps build strength?
Advanced lifters in the 2009 guidance focus on heavy sets of 1 to 6 reps. Newer lifters can gain strength with 8 to 12 reps at moderate loads.
How we calculate: every formula, with its author and year, is on our method page; data sources and their licenses are on sources.
gymnical.com gives estimates from published formulas and public data. It is not medical advice and not a training prescription. Last reviewed November 2026.