Square Yards to Square Mils: the quick answer
1 yd² = 1,296,000,000 mil²
1 square yard equals 1,296,000,000 square mils
To convert square yards to square mils, multiply the value by 1,296,000,000. To go the other way, multiply square mils by 7.71605 × 10⁻¹⁰ to get square yards.