Compound Angles

Angles never add, slopes do. Two splays and a height in — your mitre, your bevel, and the leg length out.

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Splay A deg

Splay B deg

Leg height in, vertical rise

Enter both splay angles and the leg height, then press Calculate.

From the book — Chapter 7. tan(resultant) = √(tan²A + tan²B) — set the bevel here. tan(sightline) = tan B ÷ tan A — set the mitre here. Leg length = height ÷ cos(resultant).

The trap: two 5° leans do NOT make a 10° bevel — they make 7.05°. Everything stays in your browser — no sign-up, nothing stored.