How equal they are depends on the efficiency number you use....most use 75% so 1# of grain equals 3/4# of DME....however this is generally applied to the recipe formulation, so once the recipe is set, it's straight percentages by weight for the actual grain bill.
Something is always fermenting....
"It's Bahl Hornin'"
Kegged: Bourbon Barrel Imperial Stout
On Deck: German Lager