Metric ruler measurements

Step 1

Look carefully at the English side of the ruler.

Metric ruler millimeters

A ruler is 12 inches long, with inch lines along the edge of the ruler (1 is at the far left and 12 is at the far right, with every number in between in numerical order). The lines at the inch numbers are the longest lines along the edge of the ruler.

Halfway between each inch line is a slightly shorter line indicating the half-inch point between each inch. Each half inch has lines dividing it in half to indicate each quarter-inch point between each inch.

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Metric ruler online

How long is ruler in cm

Quarter inches have lines halfway between them to indicate eighth inches also.

Step 2

Examine the metric side of the ruler (on the opposite edge). The metric side of the ruler has centimeter numbers from 1 on the far left up to 30 on the far right.

The final metric point on the ruler is 30.5, making the ruler 30.5 cm long. The longest lines at each centimeter number indicate the centimeters along the edge of the ruler.

Step 3

Find the shorter millimeter lines between each longer centimeter line.

Each centim

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