StubCalcStubCalc Bend / Free calculators
Back-to-back 90 calculator
Two 90s on one stick, a set distance apart outside to outside, for example over a doorway or between two boxes. Enter the first stub and the outside-to-outside size.
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Every bend type, your exact bender, saved jobs and a bend sheet to share. Works offline on the job. StubCalc Bend is in beta now.
How back-to-back 90s are laid out
Bend the first 90 like a stub-up: mark = stub − take-up, arrow on the mark, hook toward the end.
From the back of the first 90, measure the outside-to-outside distance and mark the pipe. On the star point (the back-of-90 mark on most hand benders) bend on that mark with the hook facing away from the first bend. On the arrow, take the take-up off first (mark = outside to outside − take-up) and bend with the hook facing the first bend.
The distance must be at least the take-up plus the pipe's outside diameter, or the two bends run into each other.
More free calculators
The five free bends from StubCalc Bend, right in your browser.
Check marks against your bender; verify with local code. The calculator uses a generic EMT hand bender. Take-up and multipliers differ between makers, so compare with the numbers on your shoe. Not affiliated with NFPA or any bender maker.