% % % 1.00 Percentage pixel pixels px 1.00 CSS Pixels (96/inch) point points pt 1.333333333333333 PostScript points (72/inch) pica picas pc 16.0 12 points inch inches in 96.0 Inches (96 px/in) millimeter millimeters mm 3.779527559055119 Millimeters (25.4 mm/in) centimeter centimeters cm 37.79527559055119 Centimeters (10 mm/cm) degree degrees ° 1.00 Degrees radian radians rad 57.29577951308232 Radians (180/pi deg/rad) gradian gradians grad 0.9 Gradians (360/400 deg/grad) turn turns turn 360 Turns (360 deg/turn) 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