Free barbell plate calculator. Enter your target weight and bar weight, and see exactly which plates to load on each side of the bar. Works in kilograms and pounds, and lets you toggle off plate sizes your gym doesn't stock.
The calculator subtracts the bar weight from your target, splits the remainder across both sides, and picks the fewest plates that get you there. If the exact weight can't be loaded with your available plates, it shows the closest loadable weight.