Yes, but the wort volume is dependent on temperature. For example, 30 liters at boil temperature is equal to approximately 28.8 liters at 20°C. The reason I'm asking is when I am logging for example the pre-boil gravity, I also register the pre-boil kettle volume, where an expected volume is noted to the right of the box. My actual volume is pretty far off the expected volume here, and I assume this expected volume is related to the estimated boil size registered in the recipe.