Raftora is an Android roof pitch calculator, rafter length calculator and roofing calculator in feet, inches and fractions. Lay your phone on the roof or on a rafter to read the pitch, then get hip and valley rafters, jack rafters, roof area, squares and how many bundles of shingles you need. Enter feet and inches with fractions to 1/16" and get answers like 14' 5-9/16". Tap any drawing to see it full screen, save results and share the cut list by text or email. Built for roofers, framers and DIY builders. Made and published by GRAMSHIFT.
What you can do with Raftora
Phone pitch gauge
Set the phone on the roof surface or on top of a rafter and read the pitch as X/12, degrees and percent. Hold the reading, zero it on a level surface, and send the pitch to every screen with one tap.
Roof area and shingle calculator
Gable, hip and shed roofs from the building length, width and overhangs. Get squares with waste, bundles of shingles, underlayment rolls, and ridge, hip, eave and rake lengths for drip edge, starter and ridge cap.
Pro: job sheets with your logo
With Pro (one-time purchase), turn a result into a PDF job sheet with your logo, company name, phone and license number. Add your prices and it shows a material cost estimate.
Hip, valley and jack rafters
Hip and valley rafter length with the ridge deduction. Each jack rafter length is laid out from the corner at 16" or 24" on center, or any spacing.
Pitch table and factors
Tap a row to use that pitch on every screen. Get the slope factor, the hip and valley factor, and the plumb cut and seat cut angles.
From pitch to cut list
- Read the pitch. Lay the phone flat on the roof or on a rafter. The pitch shows right away as X/12 and degrees, and one tap sends it to every screen.
- Enter your measurements. Enter the span, ridge board and overhang for the rafter cut length, or the building size and overhangs for squares and bundles.
- Save and share. Save results and send the cut list by text or email. With Pro, hand your customer or crew a PDF job sheet with your logo.
Free and Pro
- Free: every calculator is free to use, with ads.
- Raftora Pro (one-time purchase): PDF job sheets with your logo (Letter or A4), material cost estimates from your prices, and no ads. No subscription.
- Remove Ads (one-time purchase): removes the ads.
- No account and no sign-in. No camera or location permission.
Frequently asked questions
How do I find my roof pitch with my phone?
Open Raftora and lay the phone flat on the roof or on a rafter. The pitch shows right away as X/12 and degrees.
How long should my rafters be?
Enter the span, ridge board and overhang on the Rafters screen. The cut length is shown in feet, inches and fractions, along with the tail length and ridge height.
How do I calculate hip and jack rafter lengths?
Raftora gives the hip and valley rafter length with the ridge deduction. It also lays out each jack rafter length from the corner at 16" or 24" on center, or any spacing.
How many bundles of shingles do I need?
Enter the building size, overhangs and pitch on the Materials screen. Raftora shows the squares and bundles with your waste factor, at 3, 4 or 5 bundles per square.
Does it work in metric?
Yes. Switch to metric for mm and m, angles in degrees and tiles per m².
Is Raftora free?
Yes. Every calculator is free to use with ads. Remove Ads and Raftora Pro are optional one-time purchases, with no subscription.
Can I make a roofing job sheet with my company logo?
Yes, with Raftora Pro. It turns a rafter or roof material result into a PDF job sheet with your logo, company name, phone and license number, and you can send it by email or text.
Good to know
- Results are estimates for planning.
- Follow local building codes and the manufacturer's installation instructions.
- Check measurements on site.
- Bundles per square and roll coverage vary by product, so use the numbers on the package.
If something does not work, or you have an idea or a request, feel free to write to us through the contact form or at contact