Convert length instantly — type a value, pick your units, and every other common unit updates live below. 100% free, runs entirely in your browser, no sign-up.
Every unit below updates live from the value you enter in the "From" field above.
Length units fall into two families that don't share a common ancestor: the metric system (millimeters through kilometers, all powers of ten) and the imperial/US customary system (inches, feet, yards, miles), which trace back to old body-part and land-survey measurements. A meter is defined today by the distance light travels in a fraction of a second, while an inch is fixed by international agreement at exactly 25.4 millimeters — that's the constant this converter uses.
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