Sizu Home › Calculators › Field-Check, Mitres & Rakes
Skirting mitre, optional
Sloped ceiling rake, optional
Enter the arm length and the measured distance between the marks, then press Calculate.
From the book — Chapter 7. Corner angle = 2 × arcsin(c ÷ (2 × arm)), where c is the measured distance between two marks made at equal arm lengths up each wall. Mitre setting = half the corner angle.
Matches Chapter 7's corner check (500 mm arms, c = 712.3 mm → 90.85°) exactly. Everything stays in your browser — no sign-up, nothing stored.