My tip is to convert the input units to whatever you would like to get. A litre is a cubic decimetre, so you will get the result in litres if you convert the inputs to decimetres:
2.4 * 1.75 * 0.18 = 0.756
This way you don't have to think about how many cubic millimetres there are in 1 litre.
Similarly, if I know a cubic metre of steel weighs 7800 kg, and want to calculate how much a metre length of 25x25x1.5 tube weighs, I convert the lengths to metres:
(0.025^2 - (0.025 - 2 * 0.0015)^2) * 1 * 7800 = 1.0998
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