Feet to CM+MM Converter (All Length Units)

Feet to Centimeters & Millimeters – Precision Length Conversion

Core idea: Millimeters and centimeters are both metric subdivisions of the foot via exact factors: 1 ft = 30.48 cm = 304.8 mm. You get mm by shifting cm one decimal place (cm × 10 = mm).

Formulas

• cm = feet × 30.48
• mm = feet × 304.8
• mm = cm × 10 (consistency check)
• Reverse: feet = cm ÷ 30.48 = mm ÷ 304.8

Quick Values

Worked Example

Example: 6 ft → cm = 6 × 30.48 = 182.88 cm; mm = 6 × 304.8 = 1828.8 mm (also 182.88 × 10).

Where Used

• Manufacturing tolerances (mm) from construction drawings (ft).
• 3D printing & CNC setups converting imperial specs.
• Material cut lists requiring both coarse (cm) and fine (mm) granularity.

Accuracy & Tips

• No approximation: factors are exact by definition.
• Mental: 1 ft ≈ 300 mm (under by 1.6%). Add 5 mm per foot to refine (305 mm).
• Use mm for precision machining; cm fine for general room dimensions.

More Examples

FAQ

• Why both cm and mm? cm for readability, mm for precision specification.
• Convert mm to ft quickly? feet ≈ mm ÷ 305 (handy mental rule).
• Is 30.5 cm per foot acceptable? Close approximate; exact is 30.48.

Exact factors 30.48 & 304.8 used; rounding only in display.