Conversion Instrument

Precision Length Converter

Convert units between international metric (mm, cm, m), imperial drafting units (inches, feet, yards), and active screen pixels.

Instant conversion across metric, imperial, and physical screen pixels (at 96.0 PPI).

Value to Convert:

From Unit:

Equivalent Lengths:

Millimeters (mm)

100 mm

Centimeters (cm)

10 cm

Meters (m)

0.1 m

Inches (in)

3.937″ (3 15/16″)

Feet (ft)

0.328 ft

Yards (yd)

0.1094 yd

Pixels (px)

378 px

Real-World Scale Comparison (100.0 mm total):

• 1.17× the width of a standard credit card (85.6 mm)

• 4.12× the diameter of a US quarter coin (24.26 mm)

• 0.33× a standard 30-centimeter ruler (300 mm)

Standard Measurement Conversion Formulas

Inches to Millimeters

mm = inches × 25.4

Millimeters to Inches

inches = mm ÷ 25.4

Centimeters to Inches

inches = cm ÷ 2.54

Inches to Centimeters

cm = inches × 2.54

Feet to Meters

m = feet × 0.3048

Meters to Feet

feet = m ÷ 0.3048

Need to measure directly? Open our Online Ruler or calibrate with our Calibration Tool.