millimeters (mm), centimeters (cm), meters (m), kilometers (km), inches (in), feet (ft), yards (yd), miles (mi), nautical miles (nmi).
How accurate are the results?
Conversion factors use the exact legal definitions where they exist (for example, 1 inch is exactly 2.54 cm and 1 pound is exactly 0.45359237 kg). Results are shown to a sensible number of decimal places.