Square Nanometers to Ares: the quick answer
1 nm² = 1 × 10⁻²⁰ a
1 square nanometer equals 1 × 10⁻²⁰ ares
To convert square nanometers to ares, multiply the value by 1 × 10⁻²⁰. To go the other way, multiply ares by 1 × 10²⁰ to get square nanometers.