One litre of water is typically equal to around four glasses of water. This estimate is based on the common measurement where one glass holds about 240 millilitres (ml). Since there are 1000 ml in a litre, if you divide 1000 ml by 240 ml, you get approximately 4.17.
This means that in practical terms, you can generally say that one litre will fill about four standard glasses of water. Keep in mind that glass sizes can vary, so the exact number might differ slightly if you’re using larger or smaller glasses.