Strength
Barbell plate calculator
Enter a target weight and bar, and this shows exactly which plates to load on each side, drawn out so you can check it at a glance. It also generates a warm-up ramp up to your working weight, and tells you if the number you want cannot be made with standard plates.
Free, no signup. Everything is calculated in your browser — nothing you enter is uploaded.
How this is calculated
Plate loading
per side = (target − bar) ÷ 2Filled greedily from the heaviest plate down. Because each standard plate divides evenly into the next size up, the greedy fill is always the minimum number of plates.
Standard plate inventory
kg: 25, 20, 15, 10, 5, 2.5, 1.25, 0.5, 0.25 · lb: 45, 35, 25, 10, 5, 2.5, 1.25Includes micro-plates, since these are what let you progress on pressing movements where 5 kg jumps are too large.
Warm-up ramp
empty bar × 8 → 40% × 5 → 55% × 4 → 70% × 3 → 85% × 2 → 95% × 1A general-purpose ramp. Heavier singles usually want more steps and longer rests; higher-rep work usually wants fewer.
What your result means
| Bar | Metric | Imperial |
|---|---|---|
| Men's Olympic barbell | 20 kg | 45 lb |
| Women's Olympic barbell | 15 kg | 35 lb |
| Training / technique bar | 10 kg | 25 lb |
| Standard EZ curl bar | ~7–10 kg | ~15–22 lb |
| Trap / hex bar | ~25 kg (varies widely) | ~55 lb (varies widely) |
Trap bars and specialty bars vary a lot between manufacturers — weigh yours if you can, rather than assuming.
How do you calculate plates on a barbell?
Subtract the bar weight from your target, then halve it — that is the load per side. For 100 kg on a 20 kg bar, that is 40 kg per side. Then fill it from the heaviest plate down: one 25, one 15. This calculator does that automatically and draws the result so you can check the rack at a glance.
The most common error is forgetting the bar. A standard Olympic barbell is 20 kg or 45 lb, which is a substantial fraction of the total on lighter sets and is easy to leave out when doing the arithmetic between sets.
Why some weights can't be loaded exactly
Plates come in fixed sizes, and every plate has to go on both sides, so the smallest change you can make is twice your smallest plate. With 1.25 kg plates as your smallest, the barbell moves in 2.5 kg steps — meaning a target like 101 kg simply cannot be loaded.
This is where micro-plates earn their place. A pair of 0.5 kg or 0.25 kg plates lets you add one or half a kilo to the bar, which is the difference between progressing on an overhead press and stalling on it for a month. The calculator tells you when your target is unreachable and gives you the nearest loadable weight.
How much should you warm up?
Enough to reach your working weight with the movement pattern rehearsed and without accumulating fatigue. For most people that means four to six ascending sets, dropping reps as the weight climbs — the ramp this calculator generates follows that pattern.
Heavier and more technical lifts need more warm-up steps, and the gaps between them should be smaller near the top. Lighter accessory work usually needs one or two ramp sets at most. If your first working set feels harder than the second, your warm-up was too short.
Frequently asked questions
- How much does a barbell weigh?
- A standard men's Olympic barbell weighs 20 kg (45 lb). A women's Olympic barbell weighs 15 kg (35 lb). Training bars are typically 10 kg (25 lb), and EZ curl bars usually fall between 7 and 10 kg. Trap bars vary a lot between manufacturers — anywhere from about 20 to 30 kg.
- Do you count the bar in the total weight?
- Yes. When someone says they bench 100 kg, that includes the 20 kg bar — so they have 40 kg of plates on each side. Always include the bar when recording a lift.
- What plates do I need for 100 kg?
- On a 20 kg Olympic bar you need 40 kg per side: one 25 kg plate and one 15 kg plate, or two 20 kg plates. On a 45 lb bar, 225 lb needs two 45 lb plates per side.
- What are micro plates for?
- Making small increases possible. Without plates smaller than 1.25 kg, the barbell can only move in 2.5 kg steps, which is a large jump on an overhead press or a close-grip bench. A pair of 0.25 or 0.5 kg plates lets you add half a kilo at a time and keep progressing.
- Does this work offline?
- Once the page has loaded, yes — all the calculation runs in your browser with no server involved. That is deliberate: this is a tool you open in a gym basement with one bar of signal.
Related
Sources
This tool provides general information about exercise and nutrition. It is not medical advice and not a substitute for a qualified professional. If you have a health condition, are pregnant, or are recovering from injury, speak to a doctor or registered dietitian before acting on any of these numbers.