Arch Calculator: Curves You Can Mark Out by Hand

Why it surfaced

This is more than a radius calculator: it supports seven arch types, produces native carpenter fractions, generates offset-coordinate mark-out tables, and includes an interactive plywood-scribing plotter. A print sheet and presets for doorways, windows, and other openings give the tool a distinctly practical, trade-facing shape.

A construction-geometry tool that calculates arch dimensions, brick counts, and field-ready coordinate tables for drawing curves on wood or walls.