Free tool · For gym goers
Barbell plate calculator: what goes on each side, and how to warm up to it
Enter the weight you want and this shows the plates for one side of the bar, plus a short warm up that gets you there. Works in pounds and kilos, on any bar weight. Free, no sign up.
What goes on the bar?
Plates for one side, plus a warm up that gets you there without wasting the session.
A standard Olympic bar is 45 lb. Womens bars are 35.
Each side of the bar
- 2 x 45lb
That is exactly 225 lb with the bar.
Your warm up
Percentages of your working weight, rounded to real plates. Short on purpose: a long warm up is one you skip.
- Empty bar45 lb x 8
- 40%90 lb x 5
- 60%135 lb x 4
- 75%170 lb x 3
- 88%200 lb x 2
- Working set225 lb
225 pounds is two 45s a side on a standard bar. The calculator above does the rest, in pounds or kilos, on whatever bar you are using, and then gives you a warm up to get there.
There is nothing to sign up for and no email to hand over. We build a fitness app and we mention it once, at the end.
The maths, so you can do it in your head
Take the bar off first, then halve what is left. That is it.
For 225 on a 45 pound bar: 225 minus 45 is 180, halved is 90 per side. Ninety is two 45s. For 315: 315 minus 45 is 270, halved is 135, which is three 45s.
The reason experienced lifters stop needing a calculator is that they memorise the plate counts rather than the weights. One plate a side is 135. Two is 225. Three is 315. Four is 405. Once those four are automatic, everything else is a small adjustment from the nearest one.
In kilos the same trick works with a 20 kilo bar. One 20 a side is 60, two is 100, three is 140.
Why some weights are impossible
Both sides of the bar have to match, so every plate you add moves the total by twice its weight. With a smallest plate of 2.5 that means the bar moves in 5 pound steps, and anything that is not a multiple of 5 above the bar simply cannot be loaded.
That is why gym numbers cluster the way they do. Nobody benches 227 because nobody can.
Some gyms have fractional plates of 1.25 or even 0.5, which brings the step down and matters a lot if you are trying to add a small amount to a lift that has stalled. If your gym has them, use them. Adding 2 pounds a month beats adding 5 pounds never.
The warm up, and why it is short
The ramp above is the empty bar, four loaded sets, and then you work. That is deliberate.
The job of a warm up is to rehearse the movement pattern and get your nervous system ready to produce force. It is not to tire you out and it is not cardio. Every set you add before the working set is a set of quality you are spending in advance.
Going up in weight while coming down in reps is the shape that does this best. You touch progressively heavier bars without accumulating fatigue, so the first working set feels like the fifth rather than the first.
Two things people get wrong. They warm up too light for too long, which achieves nothing but a queue for the rack. Or they jump straight to the working weight, which is where most avoidable tweaks come from, especially on a first lift of the day.
RPE, without the mystique
RPE gets talked about like it is complicated. It is not. It is how many reps you had left, subtracted from ten.
Finished a set and could not have done another? That is a 10. Had one more in you? A 9. Two more? An 8. Three? A 7. Anything easier than that is a warm up.
The reason it is worth learning is that it survives a bad day. A program that says 80 percent for five does not know you slept four hours and skipped lunch. A program that says five reps at RPE 8 adjusts itself, because two reps in reserve on a bad day is simply a lighter bar.
Tracking it is where it compounds
Knowing what goes on the bar today is a ten second problem. Knowing what went on it every session for the last year, and whether that line is going up, is the thing that actually changes your training.
BryksBuilt logs every set, works out your estimated max on the lifts you train, and shows you the trend alongside your food and your programs. Free to download.
Common loads, per side
On a 45 pound bar. These are the numbers people actually put on a bar, so if you are here to settle an argument about what 315 looks like, it is three 45s a side.
| Total | Each side | Plates per side |
|---|---|---|
| 95 lb | 25 lb | 1 x 25 |
| 135 lb | 45 lb | 1 x 45 |
| 155 lb | 55 lb | 1 x 45, 1 x 10 |
| 185 lb | 70 lb | 1 x 45, 1 x 25 |
| 225 lb | 90 lb | 2 x 45 |
| 275 lb | 115 lb | 2 x 45, 1 x 25 |
| 315 lb | 135 lb | 3 x 45 |
| 405 lb | 180 lb | 4 x 45 |
The RPE scale, in plain terms
RPE is just reps in reserve counted backwards from ten. An RPE of 8 means two reps left in the tank. That is a definition rather than a measurement, which is why it is worth learning: it travels across every lift and every week without needing a percentage.
| RPE | Reps left | What it feels like |
|---|---|---|
| 10 | 0 | Could not have done another rep |
| 9.5 | 0 to 1 | Maybe another rep, would not bet on it |
| 9 | 1 | One more rep, definitely no second one |
| 8 | 2 | Two more reps. The bar is moving but slowing |
| 7 | 3 | Three more. Fast bar speed, working but comfortable |
| 6 | 4 or more | Warm up territory |
We deliberately do not publish an RPE to percentage table. Those vary a lot by lifter and by lift, and we have no data of our own to stand one up. If you want percentages, use the one rep max calculator, which is built on a formula we can show you.
Free to download
Knowing the number is the easy part
Hitting it four days out of five for a year is the whole job. BryksBuilt tracks your workouts, your food and your progress in one place, and it is free to download.
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Questions people ask
The short answers
What plates make 225 pounds?
Two 45 pound plates on each side of a 45 pound bar. That is the one everybody memorises first, because two plates a side is the same answer in every gym in the world. 135 is one plate a side, 315 is three, 405 is four.
Do I count the bar in the weight?
Yes, always. A standard Olympic bar is 45 pounds or 20 kilos, and a womens bar is 35 pounds or 15 kilos. When somebody says they bench 225, they mean 225 including the bar, which is 90 pounds of plates on each side.
Why can I not make some weights exactly?
Because the plates come in fixed sizes and both sides have to match. With standard plates the smallest jump you can make is 5 pounds total, or 2.5 a side, so anything that is not a multiple of 5 above the bar is not loadable. The calculator tells you how close it can get and by how much it misses.
How many warm up sets should I do?
Four loaded sets after the empty bar is plenty for most people, and the ramp above is deliberately short. A long warm up is one you skip when you are late, and a skipped warm up is worse than a brief one. Go heavier and lower in reps as you climb, because the point is to rehearse the movement and wake the nervous system, not to tire yourself out before the work.
What does RPE 8 mean?
Two reps left in the tank. RPE is reps in reserve counted backwards from ten, so RPE 10 means you could not have done another one, RPE 9 means one more, and RPE 8 means two more. It is a definition rather than a measurement, which is what makes it useful across different lifts and different days.
Should I use RPE or percentages?
Percentages are easier to plan with and RPE is more honest on the day. A program written in percentages does not know you slept badly. Most people who lift for long enough end up using percentages to write the plan and RPE to adjust it, and that combination is more robust than either on its own.
Where the numbers come from
Every competitor price on this page was read on the company's own pricing page on the date shown. Prices change; if one has, email support@bryksbuilt.com and we will fix it the same week.
- apps.apple.com/app/id6760272101: “BryksBuilt: Fitness Tracker, free to download with an in app Pro subscription” (checked September 10, 2026)
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