Free online calculator
Elbow Arc Development
The true centreline length of an elbow — for marking plate or pipe.
How it works
- R = factor × NPS × 25.4
- Arc = R × angle (in radians)
- Centreline arc = R × angle × π ÷ 180
Worked example
NPS 6", 90°, LR → R 228.6 mm, arc ≈ 359 mm.
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Reference tool — always validate against project specs. Not a substitute for a qualified engineer.