Convert 1 are to square millimeter

1 a (are) is equal to 100,000,000 mm² (square millimeter). To convert from are to square millimeter, multiply by 100,000,000 or divide by 0.00000001.

• 1 a × 100000000 = 100000000 mm²
• 1 a ÷ 1.0E-8 = 100000000 mm²