Barbell Plate Calculator
Plates per side for any target, with the plates you actually have.
One side of the bar
Your plates
Pairs of each plate you have (one for each side). Set 0 for plates you don’t have. Remembered on this device.
Warm-up ladder
A common pattern from the empty bar to about 90% of your target. Change any percentage or rep count; each weight is rounded to what your plates can make.
| Set | % of target | Reps | Weight | Plates each side |
|---|
About the Barbell Plate Calculator
Enter the weight you want to lift, choose your bar and collars, and tick the plates your gym actually has: the calculator shows exactly which plates go on each side, heaviest first, as a list and as a colour-coded diagram of the sleeve. It always uses the fewest plates possible, and when the target cannot be made with your plates it shows the nearest weights you can load below and above it.
It works in kg or lb, with the IWF competition colours for kilogram discs, and can build a warm-up ladder — empty bar to about 90% — with every step rounded to a weight your plates can make. Everything is calculated in your browser.
How to use it
- Choose kg or lb and enter your target weight.
- Pick the bar (20 kg, 15 kg, 45 lb … or your own) and the collars: none or light clips, competition collars (2.5 kg each) or a custom weight.
- Under Your plates, set how many pairs of each plate you have (0 for none) or add an unusual plate; the list is remembered on this device.
- Read the plates per side and the diagram. If the target is not possible, pick the closest option shown.
- Open Warm-up ladder to see each warm-up step loaded with your plates; copy or print it for the gym.
Examples
Each side: 25 kg + 15 kg
Each side: 2 × 25 kg + 5 kg + 2.5 kg
Each side: 2 × 45 lb
Not possible exactly — nearest: 100 kg (1 kg lighter) or 105 kg
Bar × 10 · 40 kg × 5 (10 kg a side) · 60 kg × 3 (20) · 75 kg × 2 (25 + 2.5) · 90 kg × 1 (25 + 10)
How the plates are chosen
The weight for each side is (target − bar − both collars) ÷ 2. The calculator then searches every combination of the plates you own (never more pairs than you have) for one that makes that weight with the fewest plates, and among equally short loadings it uses the heaviest plates — the way competition bars are loaded. If no combination is exact, it shows the closest lighter and heavier loadings. Because every plate goes on both sides, the total moves in steps of twice the plates’ common unit: with 25, 20, 15, 10, 5, 2.5 and 1.25 kg plates, 2.5 kg at a time.
Bars, collars and plate colours
- IWF weightlifting: the men’s bar weighs 20 kg and the women’s bar 15 kg, with two 2.5 kg collars. Competition discs are coloured by weight: 25 kg red, 20 kg blue, 15 kg yellow, 10 kg green, 5 kg white, and the change plates 2.5 kg red, 2 kg blue, 1.5 kg yellow, 1 kg green and 0.5 kg white. The heaviest discs go on first.
- IPF powerlifting: the bar and collars weigh 25 kg together (a 20 kg bar and two 2.5 kg collars); discs run from 1.25 kg to 25 kg (with 0.25, 0.5 and 1 kg for record attempts); 25 kg discs are red, 20 kg blue and 15 kg yellow, and 10 kg and under may be any colour. Heavier discs go innermost.
- Pound plates (45, 35, 25, 10, 5 and 2.5 lb) have no international colour code, so the diagram shows them in grey. Gym bars marked "45 lb" are usually close to 20 kg; check yours if your total must be exact.
The warm-up ladder
The ladder starts with the empty bar and climbs to 40, 60, 75 and 90% of your target, with fewer reps as the weight rises. It is a common pattern, not a rule — change any percentage or rep count to match your programme. Each step is rounded to the nearest weight your plates can make.
Sources
- International Weightlifting Federation. Technical and Competition Rules & Regulations 2025, 3.3.3 Barbell — bars, competition discs and colours, collars and loading (iwf.sport)
- International Powerlifting Federation. Technical Rulebook, 2.3 Bars and discs and 2.4 Collars
Limitations
- Plate weights are taken at face value; real plates and bars can be a little heavier or lighter (IPF competition discs must be within 0.25% or 10 g).
- Up to 20 pairs of each plate, plates up to 50 kg (100 lb) and targets up to 600 kg (1,320 lb) are accepted.
- The diagram shows one side of the bar; load the other side the same way.
Privacy
Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.
Frequently asked questions
How many plates do I need for 100 kg?
On a 20 kg bar without collars, 40 kg a side: one 25 kg and one 15 kg plate, or two 20s if you have no 25s. Set the 25 kg plates to 0 pairs and the calculator switches to 2 × 20 kg.
How much does an Olympic bar weigh?
The IWF men’s bar weighs 20 kg and the women’s bar 15 kg. Many gyms label bars 45 lb (about 20.4 kg) and 35 lb (about 15.9 kg). Technique and specialty bars vary, so enter your own bar weight if it is different.
Should I count the collars?
Competition collars weigh 2.5 kg each and count towards the total: an IPF bar with collars is 25 kg. Light spring clips are usually ignored; choose "none or light clips" for them.
Why can’t it make my exact weight?
Every plate goes on both sides, so in a standard set the total moves in steps of twice your smallest plate: with 1.25 kg as your smallest plate you can make 2.5 kg steps, and 101 kg needs 0.5 kg plates. If your plates cannot make the target at all, or all of them together are not enough, the calculator says so and offers the nearest weights you can load. The calculator shows the nearest weights you can load instead.
What do the plate colours mean?
International weightlifting colours plates by weight — red 25 kg, blue 20 kg, yellow 15 kg, green 10 kg, white 5 kg — and its rules require discs to be loaded so the referees and jury can identify each one. Powerlifting fixes the colours of the 25, 20 and 15 kg discs only.