Question

Was the soviet union bigger than the british empire

Answer 1

You need a time period to be entered here because the Maximum Land area
(million Km to the power of 2) list the British Empire as 35.5 to the power of 3, while the Soviets only have a 22 or so.  According to this information, the British Empire is larger in land mass than the Soviet Union.  Again, we need a time period for an accurate answer.