5 inches equal exactly 12.7 centimeters (cm) or 127 millimeters (mm). To picture this length, think of the longer side of a standard 3 × 5-inch index card or five US quarters placed in a row, which measure approximately 4.78 inches together. Knowing
4 inches equal exactly 10.16 centimeters (cm) or 101.6 millimeters (mm). To picture this length, think of the shorter side of a standard 4 × 6-inch photograph or two AA batteries placed end to end. Both provide familiar ways to understand what 4
Three inches equal exactly 7.62 centimeters (cm) or 76.2 millimeters (mm). To picture this length, think of one side of a standard 3 × 3-inch sticky note or the shorter edge of a 3 × 5-inch index card. Both provide a familiar reference
Two inches equal exactly 5.08 centimeters (cm) or 50.8 millimeters (mm). To picture this length, think of a standard AA battery, which measures almost 2 inches from end to end, or the short side of a US business card, which measures exactly 2
One inch is exactly 2.54 centimeters (cm) or 25.4 millimeters (mm). To picture how long 1 inch is, imagine the diameter of a US quarter, which is slightly smaller than an inch, or a 25 mm gaming die, which is almost the same