Ruler — Object Measuring 8 cm — free printable diagram

How long is 8 cm?

The object in this illustration measures 8 centimetres. It starts at the 0 mark on the ruler and ends at 8, so its length is 8 cm — which is the same as 80 millimetres, or about 3.15 in.

Centimetres

8 cm

Millimetres

80 mm

Metres

0.08 m

Inches

≈3.15 in

• Measure from the 0 mark, not from the end of the ruler. Most rulers have a small margin before the scale begins, and starting there is the commonest source of a wrong answer.
• Each numbered mark is 1 centimetre and each small mark between them is 1 millimetre, so 10 mm = 1 cm and 8 cm = 80 mm.
• To convert centimetres to millimetres, multiply by 10: 8 × 10 = 80 mm. To go the other way, divide by 10.
• To convert centimetres to metres, divide by 100: 8 ÷ 100 = 0.08 m.
• One inch is exactly 2.54 cm, so 8 cm ÷ 2.54 is about 3.15 in.