See how big things really are

Clear answers for lengths, heights and weights, with real objects you already know, accurate conversions and simple ways to measure.

Size converter

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How long is it? Our length guides turn inches, feet, centimeters, millimeters and meters into things you can actually picture. Each guide…

How heavy is it? Our weight guides compare pounds and grams to common objects, food and household items, with exact conversions and…

How tall is it? Our height guides compare heights to children, furniture, doors and other familiar things, so you can picture any…

3 inches is exactly 7.62 cm, or one-quarter of a foot. See 9 real objects that are 3 inches long,…

4 inches is exactly 10.16 cm, or one-third of a foot. See 11 real objects that are 4 inches long,…

Conversions use exact definitions, like 1 inch = 2.54 cm. Examples are checked against official specs and trusted sources.

Every example says if it is exact, very close or only approximate, and which side we measured.

Simple English, real objects and quick ways to measure without a ruler. Read our editorial policy.