About the Barbell Plate Calculator
This barbell plate calculator tells you which plates to put on each side of the bar to hit a target weight, so you are not doing mental arithmetic between sets. Choose pounds or kilograms, the bar weight and the plates your gym has, and it lists the plates per side heaviest first — the way you would load them.
It suits lifters following a percentage-based programme, coaches loading bars for a group, and anyone switching between a 45 lb and a 20 kg bar. If the exact target cannot be made with the available plates, it shows the closest weight you can load without going over and how far off it is.
A warm-up table shows the plates for 50% to 100% of the target, and you can include the weight of collars (competition collars weigh 2.5 kg each).
How to use the barbell plate calculator
- 1Choose pounds or kilograms.
- 2Enter the total weight you want to lift.
- 3Enter the bar weight and any collar weight.
- 4Pick the plate set your gym has.
- 5Load the listed plates on each side, heaviest first, and use the warm-up table to build up.
Formula and method
Subtract the bar and collar weight from the target and halve the rest to get the plate weight needed on each side. The calculator then fills each side heaviest plate first — the standard way to load a bar — using as many of each plate as fit without going over.
If the remainder cannot be matched exactly with the plates available (for example 187.5 lb without 1.25 lb plates), the result is the heaviest load that does not exceed the target, and the difference is shown. Warm-up rows apply the same method to 50–100% of the target weight.
- target
- Total weight you want on the bar
- bar
- Empty bar weight (e.g. 45 lb or 20 kg)
- collars
- Combined weight of both clips/collars
Worked examples
225 lb on a 45 lb bar
225 − 45 = 180 lb of plates, or 90 lb per side — two 45 lb plates on each side, the classic “two plates”.
140 kg on a 20 kg bar
140 − 20 = 120 kg, or 60 kg per side: two 25 kg plates and a 10 kg plate on each side.
187.5 lb without fractional plates
Each side needs 71.25 lb. With 2.5 lb as the smallest plate, the closest you can load is 45 + 25 = 70 per side, or 185 lb — 2.5 lb short. Adding 1.25 lb plates makes the exact weight.
150 kg with 2.5 kg competition collars
150 − 20 − 5 = 125 kg of plates, 62.5 kg per side: 25 + 25 + 10 + 2.5.
Frequently asked questions
How much does an Olympic barbell weigh?+
A standard men’s Olympic barbell weighs 20 kg (about 44 lb, usually rounded to 45 lb in US gyms). A women’s bar weighs 15 kg (about 33–35 lb). Technique and EZ bars are often lighter — check the label.
How do you calculate the plates for a barbell?+
Subtract the bar weight from the total, divide by two, and load that much on each side, heaviest plates first. For 315 lb on a 45 lb bar: (315 − 45) ÷ 2 = 135 lb per side, or three 45s.
Should I count the collars in the weight?+
In powerlifting and weightlifting competitions, yes — each competition collar weighs 2.5 kg and counts toward the total. Most spring clips in commercial gyms weigh very little and are usually ignored.
What does “two plates” mean in the gym?+
It means two 45 lb (or 20 kg) plates on each side of the bar. On a 45 lb bar that is 225 lb; “three plates” is 315 lb and “four plates” is 405 lb.
Why can’t I make my exact target weight?+
Plates come in fixed sizes, so some totals need a plate smaller than your gym has. With 2.5 lb as the smallest plate, totals move in 5 lb jumps; fractional or change plates allow smaller increments.