Free Roof Pitch Calculator for Chrome: Pitch, Angle and Rafter Length Instantly

Quick answer: The QuoteCore+ Roof Pitch Calculator is a free Chrome extension that works out roof pitch, angle, slope and rafter length the moment you type your measurements. It converts between rise/run, degrees and pitch ratios, needs no account, and installs from the Chrome Web Store in under a minute. Get it free on the Chrome Web Store.

If you price roofs for a living, you convert pitch measurements constantly. The plan says 30 degrees, the supplier wants a ratio, the rafter length needs the slope factor. This article explains exactly what the extension does, how to install it in 30 seconds, and how it connects to the rest of the free QuoteCore+ toolset.

What the extension does

The QuoteCore+ Roof Pitch Calculator is a popup that lives in your Chrome toolbar. Click the icon, enter what you know, and it instantly calculates:

• Roof pitch as a ratio (e.g. 6:12)
• Angle in degrees from rise and run
• Slope percentage for drainage and fall calculations
• Rafter length from span and pitch
• Conversions between rise/run, degrees and pitch ratios

It is built by the team behind QuoteCore+ — roofing quoting and takeoff software — so the maths is the same maths that powers the free roof pitch calculator and rafter length calculator on our site. The extension just puts it one click away, on any tab, while you work.

Install it in 30 seconds

1. Open the QuoteCore+ Roof Pitch Calculator on the Chrome Web Store in Chrome, Edge, or any Chromium browser (Brave, Arc, Opera).
2. Click Add to Chrome, then confirm Add extension.
3. The QuoteCore+ icon appears in your toolbar — click it any time. Pin it for one-click access.
4. Type your measurement, and the answer appears as you type. Nothing else to set up.

Who it is for

• Roofers on site — check a pitch conversion on your phone or laptop without hunting for a calculator app
• Estimators — sanity-check rise/run figures from plans while you work in other tabs
• DIYers and builders — get rafter lengths and slope right before ordering materials

If you need more than pitch — full roof areas, hips, valleys, ridges, barges and material quantities — the free roof takeoff builder handles the whole takeoff, and it is also free.

From pitch to a full quote

The extension is a single-purpose tool. When you want to turn that pitch into a complete, priced, customer-ready quote — the QuoteCore+ platform picks up where it leaves off: digital takeoff, AI Scan Assist, Smart Components with your own pricing rules, then quotes, orders and invoices from the same job data.

Interactive demo

Try our real system in 30 seconds or less

The same takeoff workstation that's in the app. No sign-in needed.

Try AI Scan AssistTry Manual Measure

Frequently asked questions

Is the extension really free?

Yes. There is no paid tier, no trial limit and no account required.

Does it need an account or sign-in?

No. It is a self-contained popup calculator. It does not ask for any details and does not connect to an account.

What data does it access?

None beyond its own popup. The extension does not request permissions to read your browsing, tabs, or any website data — it is a calculator that opens when you click it and closes when you are done.

Does it work in Edge, Brave, Arc or Opera?

Yes — any Chromium-based browser can install Chrome Web Store extensions.

Can it convert pitch to degrees?

Yes — that is one of its core modes. Enter rise and run, a ratio, or an angle, and it gives you the other formats. For a deeper walkthrough of the maths, see how to calculate roof pitch.