“A ruler is 30 inches — same as 30 cm.”
Usage Entry 1326 / 1350 60-second read
Inch vs. Centimeter
Imperial unit (2.54 cm) versus metric unit (10 mm).
The comparisoni
“A ruler is 30 cm (≈ 12 inches) — 1 inch = 2.54 cm. The numbers aren't interchangeable.”
The ruleii
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1 IN = 2.54 CM.
INCH (2.54 cm) is the imperial unit. CENTIMETER (0.3937 in) is the metric unit. A foot is 12 inches; a metre is 100 centimetres. 30 cm ≈ 1 foot is a useful mental ruler.
Memory aidiii
Remember it like this
1 in = 2.54 cm.