Free barbell plate calculator
Enter your target weight, choose pounds or kilograms, select your bar and available plates, and see exactly what to load on each side.
Free barbell plate calculator
Use this free RackMath barbell visualizer to calculate plates per side for pounds or kilograms. Enter a target weight, choose your bar, and see the loaded bar before your next set.
How it works
RackMath subtracts the bar weight from your target weight, divides the remaining load across both sleeves, and builds the closest plate setup from the plates you selected.
If your exact target cannot be loaded with the available plates, the calculator shows the closest loadable weight so you can adjust the set without guessing.
Mistakes to avoid
A 45 lb bar, 20 kg bar, women's bar, training bar, specialty bar, or collars can change the math. Pick the actual bar and plates you have before you load the set.
Common examples
| Target weight | 45 lb bar plate setup |
|---|---|
| 95 lb | 25 lb per side |
| 135 lb | 45 lb per side |
| 185 lb | 45 + 25 per side |
| 225 lb | 45 + 45 per side |
| 315 lb | 45 + 45 + 45 per side |
| 405 lb | 45 + 45 + 45 + 45 per side |
Subtract the bar weight from your target weight, divide the remaining weight by two, then load that amount on each side using your available plates.
Yes. Switch the unit control to kg to use common 20 kg and 15 kg bars with kilogram plates.
The calculator shows the closest loadable weight based on the plates you selected, so you can adjust the set without doing extra math.
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