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Gothic Arch Layout and Voussoir Calculator with full scale Voussoir and Keystone printable templates

Base Width Intrados (inside) Height Radius Feet Inch

Arch Thick Spring Height ? Calculate Voussoirs (one masonry unit of the arch) with Keystone and Voussoir dimensions and full scale templates. Voussoirs Dimensions Color ? Shows an average height person in archway for visual perspective of dimensions Person

Scale

Enter Increments to plot points along chord of arch, to mark out the intrados if you can't reach the center of the Radius.

Increments

Scale

Lengths from Chord to Arc Perimeter at Increments - From Center Out.
Mark-out

Masonry Arch Terminology:
Voussoir: One masonry unit of an arch.
Extrados: The curve which bounds the upper (outside) edge of the arch
Intrados: The curve which bounds the lower (inside) edge of the arch
Keystone: The voussoir located at the crown of the arch. Also called the key
Crown: The apex of the arch's extrados
Equilateral Arch: Arch width = arch radius - an equilateral triangle fits within its inner bounds
Lancet Arch: Arch width is less than arch radius - the crown is higher and sharper
Drop Arch: Arch width is greater than arch radius - the crown is lower and rounder