% % % 1.00 Percentage pixel pixels px 1.00 CSS Pixels (96/inch) point points pt 1.3333333333 PostScript points (72/inch) pica picas pc 16.0 12 points inch inches in 96.0 Inches (96 px/in) millimeter millimeters mm 3.77952755913 Millimeters (25.4 mm/in) centimeter centimeters cm 37.7952755913 Centimeters (10 mm/cm) meter meters m 3779.52755913 Meters (100 cm/m) foot feet ft 1152 Feet (12 in/ft) degree degrees ° 1.00 Degrees radian radians rad 57.296 Radians (57.296 deg/rad) font-height font-heights em 1.00 Font height x-height x-heights ex 0.50 Height of letter 'x' half-em half-ems en 0.50 Half of font height