Square Nanometers to Hectares: the quick answer
1 nm² = 1 × 10⁻²² ha
1 square nanometer equals 1 × 10⁻²² hectares
To convert square nanometers to hectares, multiply the value by 1 × 10⁻²². To go the other way, multiply hectares by 1 × 10²² to get square nanometers.