26 The Hebrew term גֹּמֶד (gomed) denotes a unit of linear measure, perhaps a cubit (the distance between the elbow and the tip of the middle finger—approximately 18 inches [45 cm]). Some suggest it is equivalent to the short cubit (the distance between the elbow and the knuckles of the clenched fist—approximately 13 inches [33 cm]) or to the span (the distance between the end of the thumb and the end of the little finger in a spread hand—approximately 9 inches [23 cm]). See 167 ; ; B. Lindars, Judges 1–5, 142.

In other versions

And Ehud made for himself a sword with two edges, a cubit in length, and he bound it on his right thigh under his clothes.

Now Ehud had made a double-edged sword about a cubit long, which he strapped to his right thigh under his clothing.

Ehud made himself a double-edged sword eighteen inches long. He strapped it to his right thigh under his clothes

So Ehud made a double-edged dagger that was about a foot long, and he strapped it to his right thigh, keeping it hidden under his clothing.

Ehud made for himself a short, two-edged sword (a cubit in length), and he fastened it under his clothes on his right thigh.

But Ehud made him a dagger which had two edges, of a cubit length; and he did gird it under his raiment upon his right thigh.

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