Length & Distance

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21 centimeters (8.27 in) is the short edge of A4 paper. See everyday objects that are 21 cm long and how to estimate the size quickly.

18 centimeters (7.09 in) is about the length of a toothbrush. See everyday objects that are 18 cm and how to estimate the size without a ruler.

1 centimeter is about the width of a shirt button or pinky fingernail (0.39 in). See 12 everyday objects that are 1 cm and how to estimate it.

11 centimeters equals 4.33 inches. See the cm to inch formula, a reference table, a quick estimate and what 11 cm looks like.

100 centimeters equals 39.37 inches (exactly 1 meter). Get the formula, a reference table and a quick estimate for cm to inches.

20 centimeters equals 7.87 inches. See the cm to inch formula, a quick reference table, a mental shortcut and what 20 cm looks like.

A kilometer is exactly 1,000 times bigger than a meter. See conversion tables, formulas, and common mistakes when converting km and m.

A meter is about 3.28 times bigger than a foot. See the ft to m conversion table, formulas, and why the US and metric systems differ.

A meter is 100 times bigger than a centimeter. See the cm to m conversion, formulas, a quick memory trick, and where each unit is used.

A centimeter is 1/100 of a meter, or 0.3937 inches. Learn how big a cm is, how it compares to mm, m and inches, and see conversion tables.

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