Roofing material calculator
Calculate tiles, battens and felt needed for a roof from area and pitch, plane by plane - a scaled tile-course diagram shows the gauge at a glance, and a materials-ready bill of quantities does the ordering maths for you.
The Planes tab's roof plane list and gable course diagram, the Materials tab's bill of materials, and the Guide tab's tile type reference.
Planes tab - roof plane list and gable course diagram
Materials tab - bill of materials
Guide tab - tile type reference
A gable cross-section diagram shows every tile course from eave to ridge, narrowing to scale as it climbs - a genuine visual of the plane's gauge, not just a number.
Add a plane for each part of the roof - front, back, hips, dormers - with its own eave width, slope length and tile type. Totals combine across every plane you add.
Tiles, battens and felt rolls, all rounded up to whole standard lengths and rolls - ready to hand to your supplier or drop into an order.
Plain clay, concrete interlocking and natural slate, each with its own tiles-per-square- metre and gauge figures baked in - switch per plane, no lookup required.
A 5% wastage allowance on tiles and a 10% overlap allowance on felt are applied automatically, so the totals you see are ready to order against, not just theoretical.
Copy a plain-text summary or export it as a standalone HTML file. Light/dark theme remembers your choice, and rotating sample roofs let you explore the app.
Marley is a well-known UK roof tile manufacturer whose free online batten-gauge guidance and technical datasheets many roofers already use. It's reference material for Marley's own tile range rather than a job tool - here's how a dedicated calculator compares.
| Feature | Roof Tile & Batten Calculator | Marley batten-gauge guidance |
|---|---|---|
| Pricing model | Free - no account, no subscription | Free (manufacturer guidance/technical data) |
| Works fully offline | ✓ | ✕ |
| Multiple roof planes rolled into one bill of materials | ✓ | ✕ |
| To-scale tile course visual | ✓ | ✕ |
| Manufacturer-neutral, any tile type not one brand | ✓ | ✕ |
| Wastage and overlap built into the calculation | ✓ | ~ |
| Named jobs, exports, dark mode | ✓ | ✕ |
| Authoritative technical spec data for one manufacturer's tiles | ✕ | ✓ |
Comparison based on Marley's publicly listed batten-gauge guidance as of August 2026 (marley.co.uk) - guidance and specifications change over time, so check marley.co.uk for current details. Marley is a trademark of its respective owner; this comparison is for informational purposes and isn't sponsored by or affiliated with Marley.
A simple hipped roof entered as four planes - two main gable-style faces and two triangular hip ends - with battens and felt priced from the same figures.
If you only know the plan run and the pitch, leave slope length blank and the app works it out as plan run ÷ cos(angle). Swap the tile type to concrete interlocking (10 per m², 345 mm gauge) and the same roof needs roughly 1,300 tiles instead of nearly 8,000 - the batten count changes with the gauge too. Open the browser edition to try it with your own figures.
Read the guide: How many roof tiles and battens do I need? - slope length from pitch, tiles per m², courses, battens and felt.
Measure it from your drawing: Measure the roof on plan in Takeoff Studio and set the pitch - you get the true roof area, free.
No - use it straight from your browser, on a phone, tablet or PC, with no sign-up. It works offline once it has loaded, and you can add it to your home screen or desktop like an app. There is also a Windows desktop version in the Microsoft Store if you prefer an installed app.
No. Roof Tile & Batten Calculator opens straight away with no sign-in - install it from the Microsoft Store and you're ready. Registering your copy for update notices is optional.
Add as many roof planes as your roof needs - front, back, hips, dormers - each with its own eave width, slope length and tile type. Totals combine across every plane you add.
Tile counts include a 5% wastage allowance and felt includes a 10% overlap allowance, using industry-standard tiles-per-square-metre and gauge figures. It's a rough ordering guide, not a cutting list - always confirm with your roofing supplier and the tile manufacturer's fixing specification.
