Bend Allowance

Bend allowance, abbreviated as BA, is the length of the arc through the bend area at the neutral axis.

 

Bend Allowance formula

\(\large{ BA = \frac{\theta \; \pi}{180} \; \left( r \;+\; K \; t \right)  }\)

Where:

Units	English	Metric
\(\large{ BA }\) = bend allowance	\(\large{in}\)	\(\large{mm}\)
\(\large{ \theta }\) (Greek symbol theta) = bend angle	\(\large{deg}\)	\(\large{rad}\)
\(\large{ r }\) = inside radius	\(\large{in}\)	\(\large{mm}\)
\(\large{ K }\) = K-factor	\(\large{dimensionless}\)
\(\large{ t }\) = material thickness	\(\large{in}\)	\(\large{mm}\)