Miniature English bulldogs have reduced size than English bulldogs. In terms of health, look,and behavior these dogs are ideal for the lovers of bulldogs. There is no fix weight of adult miniature English bulldogs because their weight can vary between 20-40 pounds.
Probably 55 to 75 pounds if it's all bulldog as that seems to be the ACTUAL norm unless they were mixed with a smaller breed like the French Bulldog or Boston which is common.