| 19.9 mm * | 0.1 cm | = 1.99 cm | 
| 1 mm | 
| Natuurkundige eenheid | Lengte | 
|---|---|
| Nanometer | 19900000.0 nm | 
| Micrometer | 19900.0 µm | 
| Millimeter | 19.9 mm | 
| Centimeter | 1.99 cm | 
| Inch | 0.7834645669 in | 
| Voet | 0.0652887139 ft | 
| Yard | 0.0217629046 yd | 
| Meter | 0.0199 m | 
| Kilometer | 1.99e-05 km | 
| Mijl | 1.23653e-05 mi | 
| Zeemijl | 1.07451e-05 nmi | 
