Barbell Plate Calculator

The weight on the bar is the bar, plus any collars, plus the same plates on each side.

Total = bar + collars + 2 × (plates on one side). The IWF counts the same three parts: its 26 kg minimum lift for men is a 20 kg bar, collars and two 0.5 kg discs^[1].

To load a target, rearrange it: plates on one side = (target − bar − collars) ÷ 2. Then pick plates that add up to that number.

With competition collars (5 kg for the pair) the same 100 kg target leaves 75 kg, so 37.5 kg a side: 25 + 10 + 2.5. Collars matter when the number has to be exact.

Two bar weights come from a rulebook: 20 kg and 15 kg. The pound bars are presets, not rulebook weights.

The IWF specifies a 20 kg men's bar and a 15 kg women's bar^[1]. The IPF requires the bar and collars together to weigh 25 kg^[2], which works out as a 20 kg bar plus two 2.5 kg collars.

The 45 lb and 35 lb figures are the pound-based gym bars this calculator offers. Neither rulebook used for this page sets them, so the table marks them as unverified. Check the weight stamped on your own bar.

A 45 lb bar is 20.41 kg and a 20 kg bar is 44.09 lb^[3]. That 0.41 kg gap is why a lifter in pounds and a lifter in kilograms can load a "standard" bar to slightly different weights. The calculator warns you when your bar and your unit do not match.

IWF discs run from 25 kg down to 0.5 kg, and the colour tells you the weight.

The IWF colour-codes its ten competition discs^[1]. The IPF is looser: 15 kg is yellow, 20 kg blue and 25 kg red, and 10 kg and under can be any colour^[2]. The IPF set also has a 1.25 kg disc, which the IWF set does not.

Neither rulebook covers pound plates, so the pound sizes offered here (45, 35, 25, 10, 5 and 2.5 lb, plus a few small ones) are unverified. Read the number stamped on the plate. The diagram draws kilogram plates in IWF colours and the rest in grey.

The rules allow a small error in each disc: the IPF 0.25 percent or 10 grams^[2], and the IWF +0.1 and −0.05 percent on discs over 5 kg^[1]. Gym plates are not held to those limits. This calculator treats every plate as exactly its stamped weight.

Plates on each side for some round loads, from the same solver the calculator uses.

These charts use the usual plates and no collar weight. The calculator handles other bars, collars and plate sets.

For a quick check, 135 lb is one 45 each side (45) and 225 lb is two (2×45). To go between kilograms and pounds, use the KG to LB Powerlifting Calculator.

The solver was checked against the IWF's own loading chart^[1]. It matched every row: all 245 for the men's bar (26 to 270 kg) and all 180 for the women's bar (21 to 200 kg). That chart uses the IWF discs and competition collars.

Taking the biggest plate that fits is not always the fewest plates, and sometimes it fails outright.

The usual shortcut takes the heaviest plate that fits, then the next, and so on. With the usual kilogram plates it gave the same answer as this calculator for every loadable weight up to 600 kg in total. With pound plates it does not.

Take 165 lb on a 45 lb bar. That is 60 lb a side. The shortcut loads 45 + 10 + 5, which is 3 plates, while 35 + 25 does it with 2.

It can also get stuck. With only 25, 20, 15 kg plates, 80 kg on a 20 kg bar is 30 kg a side. Taking the 25 first leaves 5 kg that no plate can fill, but 2×15 works.

The calculator checks every combination and keeps the one with the fewest plates. If two use the same number, it takes the heavier plates, as the shortcut would. For 100 kg on a 20 kg bar that is 25 + 15, although 2×20 also makes 40.

Heaviest plates on first, the same on both sides, and the collars last.

The IWF loads the heaviest discs first and the lighter ones after them in descending order, out to the end of the bar^[1]. The IPF says the same: heavier discs innermost, smaller ones outside^[2]. It also loads the first, heaviest disc face in and the rest face out^[2].

Both rulebooks use collars on every bar, 2.5 kg each^[1][2]. In your own training the collar weight is up to you. Pick the collars you use and the calculator counts them.

After loading, check each side against the list. The plates on the left and the right should match, and the total on the display should match the weight you meant to lift. Sleeve length differs between bars, so check that a long stack fits.

It does the sums for a bar and plates. It does not know your gym.

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  How many plates your gym has

  The solver assumes you have as many plates of each size as the load needs. If your gym owns two pairs of 20 kg plates, check that the answer does not ask for a third.

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  Sleeve length and plate thickness

  Bars, bumper plates and steel plates all differ in size. The calculator warns about a long stack but cannot measure your bar.

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  Plate-loaded machines

  Leg presses, Smith machines and similar equipment often have their own sled or bar weight. Check that weight before you trust a total.

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  Other bars

  Trap bars, EZ bars and safety squat bars are not in the presets, and their weights differ from bar to bar. Use the Another bar option and enter the weight stamped on yours.

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  Fractional plates (2, 1.5, 1, 0.5, 0.25 kg and similar)

  They are listed so you can switch them on. Only some of these sizes appear in a rulebook, and what a gym owns varies.

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  What weight to lift

  For warm-up sets that you then load with plates, use the Warm-Up Calculator. To estimate a max from a set, use the One Rep Max Calculator.