Guide
Barbell plate weights and colors.
Standard lb plates.
Most US gyms stock this lineup. The denominations follow a 45–35–25–10–5–2.5–1.25 ladder, so any total ending in a multiple of 2.5 lb is buildable from pairs.
| Plate | Common use |
|---|---|
| 45 lb | The workhorse. Every major milestone (135, 225, 315, 405) is built from pairs of 45s. |
| 35 lb | Mid-range jumps; 1 × 45 + 1 × 35 = 160 lb on a 45 lb bar. |
| 25 lb | Finishing touches — 45 + 25 per side gives 185 lb on a 45 lb bar. |
| 10 lb | Warm-up ramps and small work-set jumps. |
| 5 lb | Standard +5 lb progression jumps per side pair. |
| 2.5 lb | Change plate. One pair = +5 lb on the bar. |
| 1.25 lb | Micro plate. One pair = +2.5 lb on the bar. |
Standard kg plates.
Metric gyms run a 25–20–15–10–5–2.5–1.25 ladder. The 1.25 kg plate (2.76 lb) is the smallest standard pair; serious micro-loading needs fractional plates below it.
| Plate | ≈ lb | Common use |
|---|---|---|
| 25 kg | 55.1 lb | The red one. Base of every heavy metric load. |
| 20 kg | 44.1 lb | Blue. Four 20s on a 20 kg bar = 180 kg. |
| 15 kg | 33.1 lb | Yellow. Mid-range jumps and warm-up ramps. |
| 10 kg | 22.0 lb | Green. Warm-up work and +20 kg jumps per pair. |
| 5 kg | 11.0 lb | White. Fine-tuning work sets. |
| 2.5 kg | 5.5 lb | Change plate. One pair = +5 kg on the bar. |
| 1.25 kg | 2.8 lb | Smallest standard change plate. |
IWF competition colors.
The International Weightlifting Federation color-codes plates so loaders and referees can read a barbell at a glance. Calibrated kilo plates in Olympic weightlifting gyms follow it strictly:
| Plate | Color |
|---|---|
| 25 kg | Red |
| 20 kg | Blue |
| 15 kg | Yellow |
| 10 kg | Green |
| 5 kg | White |
| 2.5 kg | Red (change plate) |
| 2 kg | Blue (change plate) |
| 1.5 kg | Yellow (change plate) |
| 1 kg | Green (change plate) |
| 0.5 kg | White (change plate) |
The small change plates repeat the same color pattern as their full-size cousins. Two cautions: commercial gyms often ignore this system entirely (their "red" 45 might just be painted red), and lb plates never use it — so treat colors as a hint and always read the stamped weight.
Bumper plates vs iron plates.
Bumpers are solid rubber (or rubber-coated) and are all manufactured to the same 450 mm (17.7 in) diameter regardless of weight. That's the point: a bar loaded with a 10 kg bumper sits at the same height as one loaded with a 25 kg bumper, and the bar lands evenly when dropped. They're built to be dropped — Olympic lifts, deadlifts on a platform, bailouts.
Iron (or steel) plates shrink in diameter as the weight drops, so the bar starts lower on light warm-ups. They take up far less sleeve space per pound, which is why 500+ lb deadlifts are loaded in iron. But they're not meant to be dropped — repeated drops crack iron, concrete, and floor joists.
Which to use: if you'll drop the bar, use bumpers. If everything stays under control and you need to fit serious weight on the sleeve, use iron. Many home gyms run a hybrid: iron innermost for the heavy base, bumpers outermost for the last few plates.
Change and micro plates.
Change plates are the small denominations that make odd totals possible. A 248 lb Madcow top set? (248 − 45) ÷ 2 = 101.5 per side = 2 × 45 + 1 × 10 + 1 × 1.25 — impossible without the 1.25s. A 82.5 kg squat? 20 + 20 + 1.25 per side on a 20 kg bar — impossible without the 1.25s.
For even finer progression, fractional/micro plates (0.5 kg, 0.25 kg, or 0.5 lb, 0.25 lb) let you add as little as 1 lb to the bar total. They're the difference between stalling on overhead press for two months and adding 2.5 lb a week. If you train at home, a set of change plates plus a pair of 1.25s is the cheapest strength investment you can make.
Common questions.
Why are bumper plates all the same size?
Bumper plates are all manufactured to a standard 450 mm (17.7 in) diameter, no matter the weight. That way, a loaded bar always starts at the same height off the floor and lands evenly when dropped — a 10 kg bumper and a 25 kg bumper both lift the barbell to competition height.
What's the difference between a change plate and a regular plate?
Change plates are the small denominations — 2.5 lb, 1.25 lb in pounds, or 2.5 kg, 1.25 kg, 1 kg, 0.5 kg in kilos — used for fine adjustments between sets. They make loads like 248 lb or 82.5 kg possible, which you can't build from big plates alone.
What do the colors on weight plates mean?
In competition, plate colors follow the IWF standard: 25 kg is red, 20 kg is blue, 15 kg is yellow, 10 kg is green, and 5 kg is white, with smaller change plates repeating the same color pattern. Commercial gym plates don't always follow this, so treat colors as a hint and read the stamped weight.
Should I buy iron or bumper plates for a home gym?
Buy bumpers if you'll drop the bar — Olympic lifts, deadlifts on a platform, or any lift you bail. Buy iron if you only press, squat, and row under control and want to load heavy in less sleeve space. Many home gyms run both: iron for the heavy base load, bumpers for the outer slots.