amount used; quantity consumed; usage
Refers to the amount of something used or consumed, such as electricity, water, data, or materials.
今月の電気使用量は先月より少なかった。
This month's electricity usage was lower than last month's.
スマホのデータ使用量を確認する。
I check my smartphone's data usage.
使用料 (a usage fee, money paid) and 使用量 (the amount used, e.g. of electricity or water) are pronounced identically but mean very different things.
Compound of 使用 (use) and 量 (amount).