How big is the National Mall?

Question

i've already googled this and i got results ranging from 142 acres to 1200 acres. please help!

Answer 1

From the Capitol steps to the Lincoln Memorial, the Mall runs 1.9 miles (3.0 km).

From the steps to the Washington Monument, the Mall spans 1.1 miles (1.8 km).

From Grant Statue to Lincoln Memorial, the Mall covers 309.2 acres (1,251,000 m²).