Originally Posted by Toadkiller Dog
I made MoreBeer's porter kit the other day. Followed the directions to a tee; they say the OG should be 1050 to 1055. Mine was 1038.
If it's an extract based kit then Mikey has come closest
1 US Gallon = 3.8 Litres. 5 US Gallons = 19 Litres
1 Imperial Gallon = 4.5 Litres. 5 Imperial Gallons = 23 Litres.
So it's roughly 6 US Gallons to 5 Imperial Gallons.
Basing DME on a hydrometer reading of roughly 1.040 a pound in a US Gallon, you'd expect 6.1/4 lb to give you a reading of 1.050ish with the US and 1.040ish with the Imperial Gallon.