Barbell Plate Calculator
Enter the target weight and the bar. The page returns the plates for each side, the weight you will actually lift, the difference, and a warm-up ladder with plates already worked out.
Loading the bar is simple arithmetic until the target is not a round number, or the bar is not 20 kg, or the gym only has pounds. Enter the target and the bar; the page returns the plates for each side, what the bar will actually weigh, how far off you are, and a warm-up ladder with the plates already counted.
The lift
Enter the total weight including the bar. Collars and clips are not counted.
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Warm-up ladder
| Set | Target | Per side | Plates |
|---|
Plate colours and pairs
| Plate | Typical colour | A pair | Notes |
|---|---|---|---|
| 25 kg | 红 | 50 kg | Largest competition plate |
| 20 kg | 蓝 | 40 kg | Standard heavy plate |
| 15 kg | 黄 | 30 kg | Common intermediate |
| 10 kg | 绿 | 20 kg | Light loading |
| 5 kg | 白 | 10 kg | Fine adjustment |
| 2.5 kg | 红（小） | 5 kg | Smallest change with a pair: 5 kg |
| 1.25 kg | 镀铬 | 2.5 kg | Smallest plate: 2.5 kg per pair |
Four rules for loading
- Per side = (target − bar) ÷ 2. The bar itself is counted once, so it never appears on one side.
- Load the largest plates first, working outward, and keep the same order on both sides so the bar stays balanced.
- The smallest change you can make with a pair of 1.25 kg plates is 2.5 kg. In pounds, a pair of 2.5 lb plates gives 5 lb steps.
- A 20 kg Olympic bar is not the same as a 15 kg women’s bar or a 10 kg technique bar. Check the end cap before you calculate.
Practical notes
- Warm up with the empty bar first, then 40, 60, 75 and 85 percent. The jump from the last warm-up to the work set should be small.
- Put a collar on even when the plates fit snugly. It stops plates sliding on a missed lift and keeps the load symmetrical.
- If the gym only has pounds, calculate in pounds and convert the target once. Converting plate by plate is where mistakes happen.
- For a 1RM attempt, load 92% for a single first. It confirms the plates and the feel before the heavier set.
Four common mistakes
- Forgetting the bar. Entering 100 kg and loading 50 kg per side gives a 120 kg lift.
- Loading one side completely before the other. The bar tips off the rack; always alternate plate by plate.
- Mixing kilogram and pound plates on the same sleeve. The arithmetic looks right and the bar is uneven.
- Chasing an exact number. If the target cannot be hit with the available plates, take the closest weight below and note the difference.
Calculations assume a symmetric load and plates of the stated weight. Actual plate weight varies with wear; for competition attempts use calibrated plates and verify the total before lifting.