What was the area of the first computer ever made?
In answeing your vague question. The area was Berlin, Germany. Or the area of the machine was 800 square feet.
The first electronic computer was made at Iowa State University, but, alas, it could not be reprogrammed. The "Z" computer was made in Germany, and was the first to be reprogrammable. The British Colossus computer was made at Bletchley Park, UK, but the first general-purpose reprogrammable computer, called ENIAC, was made at the University of Pennsylvania in 1946.
According to me as much as I know being in 7th Class, It would be Eniac. ENIAC was a "one off" military computer custom designed for the US Army, no more were made and none were ever available commercially. The first US commercially available computer was made by Remington Rand starting in 1951, it was UNIVAC I.