Converting metric units of length:

1. 1 mm = 0.1 cm = 0.001 m = 0.000001 km.
2. 1 cm = 10 mm = 0.01 m = 0.00001 km.
3. 1 m = 1,000 mm = 100 cm = 0.001 km.
4. 1 km = 1,000,000 mm = 100,000 cm = 1,000 m.

To convert inches of fabric to centimeters of fabric:

1. There is 2.54 cm in one inch.
2. To convert length in inches to length in centimeters, multiply the number of inches by 2.54 (because in every inch, we've got 2.54 cm).
3. length [cm] = length [in] × 2.54

To convert mph to ft:

1. Know that one mile equals 5,280 ft.
2. Multiply the number of miles by how many feet there are in one mile.
3. As an easy formula: speed [ftph] = speed [mph] × 5,280