3480000 ft2 equals how many miles?

Answer 1

Assuming you are wanting square feet converted to SQUARE miles (unlike English, Mathematics uses a very precise language - miles are a measure of length, square miles (or miles squared) are a measure of area, square feet (or feet squared) are a measure of area; measures of area can be converted, but conversion of a measure of area to a measure of length is impossible), then:

1 mile = 5280 ft

→ 1 sq mile = 1 mile × 1 mile = 5280 ft × 5280 ft = 27878400 sq ft

→ 3480000 sq ft = 3480000 ÷ 27878400 sq miles = 725/5808 sq miles ≈ 1/8 sq miles = 0.125 sq miles

Answer 2

It doesn't make sense to convert between units of area and units of length.