MariposasWarm-Up Set Calculator
By Zachary, builder of Mariposas · Reviewed against published exercise-science sources (references)
· Last updated June 2026
Strength | Set | Weight | Reps |
|---|---|---|
| 1 | 45 lb | 8 |
| 2 | 90 lb | 5 |
| 3 | 135 lb | 3 |
| 4 | 180 lb | 2 |
Jumping straight to your working weight is a recipe for a bad session. This builds a sensible warm-up ramp, empty bar then progressive jumps, so you arrive at your top set primed, not gassed.
How it works
The calculator takes your target working weight and builds a series of progressively heavier warm-up sets, starting from an empty bar. The underlying logic mirrors what coaches have used for decades in powerlifting prep: each warm-up set jumps by a roughly proportional percentage of the working weight rather than a fixed plate increment, so the jumps feel manageable whether your top set is 135 lb or 405 lb. A common approach spaces sets at approximately 40%, 60%, and 80% of the working weight, with reps dropping as the load climbs, keeping accumulated fatigue low while still getting the nervous system, connective tissue, and prime movers progressively loaded. The rep scheme matters as much as the weight: higher reps at lower loads promote blood flow and motor pattern rehearsal, while the final warm-up set at roughly 80 to 90% lets you feel near-working-weight tension without burning through the glycolytic reserves you need for the actual lift. Some calculators also round each set to the nearest practical plate combination so you are not hunting for a 2.5 lb fractional plate mid-session.
When to use it
This tool is most useful any time you are training a barbell movement with a defined working weight: squat, bench press, deadlift, overhead press, or any heavy compound variation. It takes the mental load off during the session itself, which matters more than it sounds because deciding plate math on the fly between sets bleeds focus. Lifters running percentage-based programs like 5/3/1 or Texas Method will find it especially handy since their working weights shift week to week and manually recalculating the ramp each time adds friction.
Worked example
Say your working weight for the back squat is 225 lb. The calculator might output something like: empty bar for 8 reps, 95 lb for 5 reps, 135 lb for 3 reps, and 185 lb for 2 reps before you load the bar to 225. Each of those weights lands close to 40%, 60%, and 80% of 225 respectively, rounded to achievable plate combos. The rep counts taper down so you are not arriving at your working set with 20 accumulated squats already in your legs. That final 185 set is particularly valuable because 82% of working weight is heavy enough to activate the same motor units you will need at 225, without creating meaningful fatigue.
Tips for an accurate result
- Treat rest between warm-up sets differently than between working sets. A minute or less between the lighter sets is fine; give yourself 2 to 3 minutes before stepping into your first real working set so the nervous system is ready rather than still catching its breath.
- The empty bar is not optional, even for advanced lifters. It is the one moment in the session to groove the movement pattern with zero load and catch any asymmetry or tightness before it becomes a problem under real weight.
- If you are doing multiple working sets at the same top weight, you only need to run the full warm-up once. After that, just rest and repeat the working weight.
- Adjust the rep counts down if the lift is a heavy deadlift and your lower back fatigues quickly from sub-maximal pulls. Many deadlift specialists keep warm-up sets to singles or doubles above 70% to save their back for the real work.
- The calculator assumes a barbell starting weight of 45 lb. If you are using a hex bar, a 35 lb women's bar, or a safety squat bar with a different collar weight, factor that in manually so the percentages land correctly.
Formula & sources: methodology · references.
Now go hit the number Mariposas turns every workout, run and class into progress · collect a cute pet 🐾FAQ
- How many warm-up sets do I actually need?
- For most barbell lifts with a working weight in the 135 to 315 lb range, three to four warm-up sets after the empty bar is enough. Very heavy working weights, say above 400 lb, sometimes justify a fifth set because the jump from 80% to 100% is simply a larger absolute number of pounds. Very light working weights might only need two sets above the bar. The calculator handles this scaling automatically, but it helps to know why.
- Should I count warm-up sets toward my total training volume?
- Generally, no. Warm-up sets are sub-maximal and the reps are low by design, so their contribution to the mechanical tension and metabolic stress that drives adaptation is minimal. Most percentage-based programs define volume in terms of working sets only. That said, if your warm-up ramp is unusually aggressive, for instance hitting 90% for a set of 5, those sets start bleeding into productive volume territory and your recovery math changes.
- Why does the calculator start with an empty bar instead of jumping to a moderate weight?
- The empty bar is disproportionately useful relative to how light it feels. It lets you rehearse the exact movement pattern, check bar path, feel for any joint stiffness, and reinforce technique before load starts masking small errors. Skipping it to save time is one of those shortcuts that tends to show up as a tweaked shoulder or a grinding squat a few weeks later.
- Do I need to warm up if I already did a general warm-up like rowing or jumping rope?
- A cardio or mobility warm-up raises core temperature and gets blood moving, but it does not prepare the specific motor units for a heavy barbell squat or press. These are different things. General warm-up and specific barbell warm-up sets serve complementary roles, and the calculator addresses only the second part.
- What if my first working set is already relatively light, like 95 lb on the bench?
- At low working weights the percentage-based jumps compress quickly and you might end up with sets at 40 and 75 lb, which is below bar weight. In practice, many lifters just do one or two sets with the empty bar at higher reps and go straight into their working weight. The calculator accounts for this by flagging when intermediate warm-up sets would fall below bar weight.