RoofRight
Or drop one here. Any photo — camera roll, WhatsApp, a screenshot of one.
Saved roofs
Nothing to save yet — measure a roof first and this fills in.
No saved roofs on this phone yet.
Saved on this phone only. A new phone starts empty, and clearing your browser's site data clears these. Nothing is sent anywhere.
Photo — counts the courses off the picture. Checked against two real roofs with hand-verified answers through eight levels of WhatsApp compression: 10 of 10 right on what it showed, 0 wrong answers shown. When it is not sure it says so and asks you to count. Drawing — set the scale off one dimension you can read, tap round the roof, and the arithmetic is exact whether the screenshot is sharp or not. Tile figures are the manufacturers' own. One roof face at a time.