Bars and plates

Plate Calculator

Updated 1 Nov 2026 · Source: powerlifting technical rules ↗

Enter the total you want on the bar and the bar's own weight, in pounds or kilograms. The calculator lists the plates for each side, heaviest first, and draws the loaded bar.

Worked example

225 − 45 (bar) = 180.0 lb of plates
÷ 2 sides = 90.00 lb per side
Largest plates first: 45 + 45

Plates per side on a 45 lb bar

Bar total (lb)	Each side
95	25
135	45
155	45 + 10
185	45 + 25
205	45 + 35
225	45 + 45
245	45 + 45 + 10
275	45 + 45 + 25
315	45 + 45 + 45
365	45 + 45 + 45 + 25
405	45 + 45 + 45 + 45
495	45 + 45 + 45 + 45 + 45

Plates per side on a 20 kg bar

Bar total (kg)	Each side
40	10
60	20
80	25 + 5
100	25 + 15
120	25 + 25
140	25 + 25 + 10
160	25 + 25 + 20
180	25 + 25 + 25 + 5
200	25 + 25 + 25 + 15

Work from the biggest plate down

The method is the same one you would use in your head. Take away the bar, split what is left in half, then fill each side with the largest plate that still fits, and repeat with the next size down. For 225 lb on a 45 lb bar, that leaves 90 lb per side: two 45s.

Big plates first also loads faster and keeps the heavy discs close to the inner collar, which is where they belong. Small plates go on last, on the outside.

Pound plates and kilogram plates are not the same

A US gym set usually runs 45, 35, 25, 10, 5 and 2.5 lb. A metric set runs 25, 20, 15, 10, 5, 2.5 and 1.25 kg. The sizes look alike but do not match: a 20 kg plate is 44.09 lb, not 45, and a 25 kg plate is 55.12 lb.

The gap grows as you add plates. Four 20 kg plates on a 20 kg bar make 180 kg, which is about 396.8 lb. Four 45 lb plates on a 45 lb bar make 405 lb, about 8 lb more. Set the unit to match the plates you are holding, not the unit you think in.

Should you count the collars?

In competition, yes. Each collar weighs 2.5 kg, so a men's bar with collars is 25 kg before any plates. If you train with competition collars, enter 25 kg as the bar weight and the calculator will plan the plates around them.

Spring clips and plastic gym clips weigh very little, and most people do not count them. Whatever you choose, do it the same way each session.

When there is a little left over

Some targets cannot be built from the plates on hand. If you ask for 230 lb on a 45 lb bar, each side needs 92.5 lb: two 45s and a 2.5. Ask for 228 lb and the calculator loads the most it can without going over, 225 lb, and shows the 3 lb it could not cover.

If your gym has nothing lighter than a 2.5 lb plate, round your target to the nearest 5 lb, or 2.5 kg on a metric set with 1.25 kg plates.

Putting it to work

Plate math usually comes right after another number. Find your training weights with the rep max chart, then load them here. If your bar is not a 45 lb Olympic bar, look up its real weight on the barbell weight page first.

For heavy sets near your max, work inside a rack with safety bars set just below the bottom of the lift, or have a spotter ready.

How Much Does a Barbell Weigh, Dumbbell Weight Chart, How Much Does an EZ Bar Weigh, Trap Bar Weight

Questions

How many plates is 315 lb?

On a 45 lb bar, 315 lb is three 45 lb plates on each side, often called three plates.

How do I load 100 kg on a 20 kg bar?

Each side needs 40 kg. With the largest plates first, that is a red 25 kg and a yellow 15 kg on each side.

Can I mix lb and kg plates on one bar?

You can, but add each plate in one unit before you lift. Reading a 20 kg plate as 45 lb puts you about 0.9 lb off per plate.

What if the target is lighter than the bar?

Then no plates go on. The calculator says so and shows the bar weight, so pick a lighter bar if you need less.

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.