バーベルプレート計算ツール（kg／lb）

計算の仕組み

The tool subtracts the bar weight from your target and halves the remainder to get the per-side load, then fills that figure greedily: it takes the heaviest plate you have marked as available, repeats while the remainder still allows it, and moves down the stack. Available denominations are 25, 20, 15, 10, 5, 2.5, 1.25, 0.5 and 0.25 in kg, and 45, 35, 25, 15, 10, 5 and 2.5 in lb. It then reports the true loaded total and either Exact match or how much you are short.

Bar weight and your plate inventory drive everything. The bar dropdown offers a 20 kg men's Olympic bar as standard plus a 15 kg women's bar, a 10 kg EZ curl bar, a 27 kg trap bar, and a custom entry for anything else. Tap any plate chip to grey it out and the greedy fill will stop using it, which is how you model a gym that has no 1.25 kg or no 35 lb plates. The Go up by field, default 5, bumps the target for your next set.

The fill assumes an unlimited supply of every denomination you leave switched on, so it will happily ask for five 25 kg plates a side. Greedy is also not always optimal on a restricted inventory: with only 15s and 10s available and 20 kg needed per side, it takes a 15 and reports being short, even though two 10s would be exact. Bar presets are stored in kilograms and converted for lb mode, so the Olympic bar reads 44.09 lb rather than a round 45.

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