Barbell plate calculator
Type the weight you want on the bar. It tells you what to hang on each side, using the plates you actually own. Works in pounds and kilos, and it runs right here — no signup, no app, no email.
What goes on each side
How the math works
A barbell is loaded symmetrically, so the arithmetic is one subtraction and one halving. Take the target, subtract the bar, and split what is left between two ends:
(target − bar) ÷ 2 = weight per side
Then fill that per-side number greedily, heaviest plate first, which is both how the math works out cleanest and how you would load it anyway — big plates against the collar, small plates outside them. 225 on a 45 lb bar is 180 across two ends, 90 a side, which is two 45s. That is where the "two plates" shorthand comes from: it means two plates per side, not two plates total.
The lifts people look up
On a standard 45 lb bar, with 45s, 25s, 10s, 5s and 2.5s available:
| On the bar | Per side | What you hang | Called |
|---|---|---|---|
| 135 lb | 45 lb | One 45 | One plate |
| 185 lb | 70 lb | 45 + 25 | — |
| 225 lb | 90 lb | Two 45s | Two plates |
| 275 lb | 115 lb | Two 45s + 25 | — |
| 315 lb | 135 lb | Three 45s | Three plates |
| 365 lb | 160 lb | Three 45s + 25 | — |
| 405 lb | 180 lb | Four 45s | Four plates |
| 495 lb | 225 lb | Five 45s | Five plates |
When the number does not come out clean
Three things throw the arithmetic off, and all three are common.
- The bar is not 45. Women's Olympic bars are 15 kg, which is about 33 lb, not 35. Most trap bars sit between 45 and 65 lb and a lot of them are not labelled. Technique and training bars run 15 to 35 lb. Weigh yours once and stop guessing — the calculator above lets you type any bar weight in.
- Home-gym plate sets are lopsided. A common starter set gives you one pair of 45s and then nothing until 10s, so 275 is unreachable even though 225 and 315 are not. Turn off the plates you do not own above and it will tell you the closest weight you can actually build.
- Kilo plates are not pound plates. A 20 kg plate is 44.09 lb. If your gym has both, do not mix them on the same bar and then log a round number.
Kilo loading, for the same lifts
On a 20 kg men's bar, with 25, 20, 15, 10, 5, 2.5 and 1.25 kg plates:
| On the bar | Per side | What you hang |
|---|---|---|
| 60 kg | 20 kg | One 20 |
| 100 kg | 40 kg | Two 20s |
| 140 kg | 60 kg | Three 20s |
| 180 kg | 80 kg | Four 20s |
| 200 kg | 90 kg | Three 25s + 15 |
Doing this without the phone in your hand
The reason a calculator page exists at all is that mid-session you do not want to be doing subtraction. Inside EatSleepRep the plate math is attached to the set you are logging: put in the weight and it shows the load for the bar you told it you are using, next to the rest timer, without opening a browser. That is one of the three daily jobs, and it is free.
Two other things on this site do arithmetic for you: the one-rep max calculator turns a set of five into an estimated max, and the macro calculator sets the calories and protein that make the bar go up in the first place.
If the bar is not moving, the answer is more often on the plate than in the program. The protein calculator gives you a daily number and the food macros reference gives you the USDA figures to hit it with — chicken breast, Greek yogurt and eggs do most of the work for most people.
Open it and close today
No signup to try it. Log a meal, log last night, log a set — the ring closes and the chain starts.
Common questions
Subtract the bar weight from your target, then halve it. That is the weight per side. Fill it heaviest plate first. For 225 lb on a 45 lb bar: 225 minus 45 is 180, halved is 90 per side, which is two 45 lb plates a side.
Two 45 lb plates per side on a standard 45 lb bar. "Two plates" always means two per side, not two in total.
Turn off the plates you do not have in the calculator above and it loads the closest weight you can actually build, and tells you how far short that leaves you.
A standard mens Olympic bar is 45 lb or 20 kg. A womens Olympic bar is 15 kg, about 33 lb. Trap bars vary widely, commonly 45 to 65 lb, and are often unlabelled, so weigh yours once.