Welcome to my square millimeters to square miles converter, also known as the mm² to mi² converter.
Use the form below to convert square millimeters (mm²) into square miles (mi²) and if you want to read an explanation of how to convert square millimeters to square miles with step-by-step instruction just click the "Explain" button.
You can also check the Quick Conversions box in the right menu for some preset calculations that are commonly searched for.
All Area Unit Converters
The list below contains links to all of our area unit converters.