1 square mile = 640 acres = 258.9988 hectares 1500 hectares x 1 square mile / 258.9988 hectares = 5.79 square miles you may try below link to convert it to other units

1 sq km = 100 hectares. 1 sq mile = 2.59 sq km so 509 hectares = 5.09 sq km = 1.97 sq mile. You might also like to remember that 1 sq mile = 640 acres, and 1 hectare = 2.47 acres

1 hectare = 10,000 square meters 12 hectares = (12 x 10,000) = 120,000 square meters This could be a circle about 390 meters in diameter, or a square field about 346 meters on a side. 1 square mile = about 259 hectares.