Free online calculator
Cope / Saddle Cut Calculator
Mark a 90° saddle on the branch — get the cope depth from the run and branch outside diameters.
How it works
- R = run OD ÷ 2, r = branch OD ÷ 2
- Cope depth = R − √(R² − r²)
- Wrap the printed template on the branch
Worked example
Run Ø168.3, branch Ø60.3 → cope depth ≈ 5.6 mm.
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Reference tool — always validate against project specs. Not a substitute for a qualified engineer.