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The length is calculated by a number of factors. The most basic example is as follows. Say a bar is required to be u shaped. It is to be placed in a 12" wide block. The bar bend would be the length of the block (12") minus a clearance on each side of the block. This clearance allows protection to the bar from weather and moisture. Typically the clear dimension is 2" or 3", depending on location in structure and engineer's specifications. That said, assuming a 2" clearance, the above example would be 12" - 2" - 2" = 8". That dimension is the out to out dimension of the rebar for that side of the bend.

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Q: How do you calculate the length of a rebar bend?
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