Convert 1 square millimeter to are

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

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