Calculate angles using the Law of Cosines from three side lengths
The Angle Calculator is a professional tool designed for carpenters, joiners, and DIY enthusiasts who need to calculate precise angles for miter cuts. Whether you're working on skirting boards, architraves, or picture frames, this calculator ensures perfect angles every time.
Our angle calculator uses the Law of Cosines to determine angles from three side measurements. Simply enter the lengths of the three sides of your triangle, and the tool calculates the angle opposite the third side, along with the miter angle needed for your cut.
Explore our other professional construction calculators: Wall Layout Calculator for picture spacing, Ceiling Spotlights Calculator for lighting layouts, Spindle Calculator for balustrade spacing, and Wallplate Square Checker for framing accuracy. Visit our apps directory for more free construction tools.
The angle calculator is trusted by UK construction professionals for accurate miter calculations. Whether you're working on interior trim, exterior cladding, or custom joinery, this tool helps you achieve perfect angles and professional finishes. The calculator works with any measurement unit and provides precise results for both small and large projects.
For more information about professional carpentry techniques and best practices, visit CITB (Construction Industry Training Board) or check out carpentry resources for angle calculation methods.