How many quarts are in one milliliter?

US standard quarts

If you are asking about US quarts, they have 32 ounces and each ounce equals 28.35 milliliters, so one US quart must be 32 x 28.35 = 907.2 milliliters.

So 1 milliliter must be equal to 1/907.2 = 0.0011022 US quarts.

UK standard quarts

If you are asking about UK quarts, they have 40 ounces and each ounce equals 28.35 milliliters, so one UK quart must be 40 x 28.35 = 1134 milliliters.

So 1 milliliter must be equal to 1/1134 = 0.0008818 UK quarts.