Barbell Plate Calculator

Figure out which plates to load per side for any target weight on a 45, 35, or 15 lb bar.

How it works

Enter the total weight you want on the bar and which bar you are using, and this calculator works out which plates to slide on per side. It starts from the heaviest plate in a standard set (45, 35, 25, 10, 5, 2.5, and 1.25 lb) and keeps loading the biggest plate that still fits, then moves to the next size down. That greedy approach always uses the fewest plates possible for a given weight.

Worked example: target 225 lb on a 45 lb bar. Subtract the bar and split the rest between two sides: (225 − 45) / 2 = 90 lb per side. A 45 lb plate fits, leaving 45 lb, and a second 45 lb plate fits exactly, leaving 0. Per side: 45, 45, for a total of 225 lb once you add the bar and the plates on both sides. A trickier number like 187.5 lb per side comes out to 71.25 lb per side after subtracting the bar, which loads as a 45, a 25, and a 1.25, with nothing left over.

If your target doesn't divide evenly into the plates you have, the calculator shows a remainder, the small bit of weight per side it couldn't match exactly. In that case, round to the nearest number you can actually load rather than trying to find fractional plates that don't exist in your gym.

FAQ

Why does it assume the same plate set every time?

Most commercial gyms and home setups use the same standard sizes: 45, 35, 25, 10, 5, 2.5, and 1.25 lb per plate. If your gym is missing a size, like no 35s, just skip that combination when loading and use two smaller plates instead; the total per side stays the same either way.

What if my bar isn't exactly 45 lb?

Switch the bar selector to 35 or 15 lb, common for shorter bars or technique bars used to learn the squat, deadlift, or press pattern before adding real load. The plate math per side adjusts automatically once you change the bar weight.

Does this account for collars?

No. Standard spring collars weigh almost nothing and don't change the loaded total in any meaningful way. Some machines with tight sleeves use collars that add roughly 0.5 lb each; this calculator ignores that small difference since it rarely changes your working weight.

What does the remainder mean in practice?

It means the exact number you typed can't be built from standard plates. This mostly happens with odd, non-round target weights. Round down to the nearest loadable total and keep training. A pound or two per side won't change your results over a training block.

For more on getting a bar into your training in the first place, see whether a barbell is worth it for a home gym, how to squat with proper form, and how to deadlift safely as a beginner.