Feet+Inches to mm
How to convert Feet+Inches to Millimeters
How to convert feet and inches to millimeters.
L(mm) = (ft × 12 + in) × 25.4
Multiply total feet by 12 to get total inches, add remaining inches, then multiply by 25.4:
L(mm) = (L(ft) × 12 + L(in)) × 25.4
Example
Convert 5 ft 9 in to mm:
L(mm) = (5 × 12 + 9) × 25.4 = 69 × 25.4 = 1752.6 mm