How to Measure a Roof Online for Free (From Any Plan Image)

Quick answer: You can measure a roof online for free by uploading a plan image (PNG, JPG or WebP) to the QuoteCore+ free roof takeoff tool, drawing a line along any known dimension to set the scale, then measuring roof areas, ridges, hips, valleys, barges and guttering lines directly on the plan. Every length is pitch-calculated automatically, so plan measurements convert to true roof measurements. No signup, no payment - and nothing is saved unless you choose to continue into the app.

One clarification before the steps: this measures from a plan, drawing or image you upload - and you calibrate it against a dimension you already know. It is not an aerial or satellite measurement service: there is no imagery lookup, and the accuracy comes from your calibration. If you need a roof measured with no plan at all, aerial report services exist - see what measurement reports cost.

This guide walks through the whole process on a computer step by step: getting your plan ready as an image, calibrating the scale, measuring each component, and turning the output into materials and a quote.

Step 1: Get your plan as an image

The free tool accepts plan images in PNG, JPG or WebP format. If your plan is a PDF, export or screenshot the relevant page as an image first (PDF upload is not supported yet - but virtually every PDF viewer can save a page as a PNG). A screenshot of an architect's drawing, a roof plan from a builder, or even a clear photo of a printed plan all work, as long as the drawing is undistorted and has at least one dimension you know the true length of.

Good candidates for calibration: a labelled wall length, a scale bar, or any dimension you measured on site. For the wider context of measuring from plans versus site visits, see How to Measure a Roof for Materials.

Step 2: Upload the plan and choose your units

Open the free roof takeoff tool and choose your units first: metric (metres), imperial (feet) or roofing squares. If you use imperial or squares, you can enter roof pitch as degrees or as a ratio like 6:12. Then upload your plan image. No account is needed for any of this - the tool is free and starts working immediately in your browser.

Step 3: Set the scale by calibrating one known dimension

This is the step that makes digital measuring accurate. Draw a line along any dimension whose true length you know - a wall, a scale bar - and enter its real length. The tool now knows the plan's scale, and every subsequent measurement is to scale. Because the calibration is done against a real dimension, it does not matter whether the plan was drawn at 1:100 or 1:50; the ratio does the work. The full calibration workflow is covered in How to Quote a Roof From Plans.

Step 4: Measure areas, ridges, hips, valleys, barges and gutters

Now measure the roof directly on the plan:

Roof areas - outline each roof plane; areas are pitch-calculated to true roof surface area automatically.
Ridges - draw along each ridge line.
Hips and valleys - diagonal lines with the correct hip/valley pitch factors applied.
Barges and verges - sloping edge lengths on gable ends.
Spouting and guttering - perimeter and gutter run lengths.
Custom lengths - any other linear measurement, in your chosen units.

The pitch calculation is the part people get wrong on paper. A plan shows horizontal dimensions; the actual roof surface is larger. At 30 degrees the factor is 1.155 - 100 m² on plan is 115.5 m² of roof. The tool applies this for you on every measurement, which is why measuring digitally beats a ruler and calculator. For the deeper background, see How to Do a Roof Takeoff: Complete Step-by-Step Guide.

Step 5: Choose units and pitch format (metric, imperial or squares)

Everything you measured is reported in your chosen units: metres, feet, or roofing squares, with pitch as degrees or a ratio. Switching is easiest at the start, so pick your units before you measure - whatever your suppliers quote in. Roofing squares (1 square = 100 sq ft) remain the standard for US material ordering.

Step 6: Use the output - materials and pricing

The finished takeoff lists every measurement with its pitch calculation, totals per component, and quantities and pricing if you build custom components with your own rates. From there:

Convert areas and lengths into material quantities with the free roofing material calculator.
Price the job properly with How to Price a Roofing Job.
Turn it into a professional document with the free quote generator.

Step 7: Optional - save and continue into the app

The free tool requires no account and saves nothing - each session is fresh. If you want to save a takeoff, reuse saved component libraries, scan plans with AI, and continue into materials, quotes, orders and invoicing, you can send the result into the QuoteCore+ app and create a free account from the output screen. That part is optional and honest about requiring an account - see roofing takeoff software for the full workflow.

Free tool vs paid measurement reports

Per-report measurement services measure the roof for you and send a report. They are a genuine option when you cannot access a plan at all. But if you have a plan - and most quoting work starts from one - measuring it yourself with a free tool is faster and free:

	QuoteCore+ free takeoff	Paid per-report services
Cost	Free, no signup	RoofSnap from $13 per report ($105/mo, $52–78/mo annual); EagleView $32.75–$105 per report (verified Aug 2026)
Source of measurements	Your own plan, measured by you	Aerial or plan-based, measured by the service
Turnaround	Immediate - you measure as you quote	Report delivery time varies by service
Pitch-calculated lengths	Yes, automatic	Yes
Works without a plan	No - needs a plan image	Aerial reports can work without a plan

For the full breakdown of what measurement reports cost and when they are worth it, see Roof Measurement Cost Comparison.

FAQ

Can I measure a roof online for free?

Yes. The QuoteCore+ free roof takeoff tool lets you upload a plan image, set the scale, and measure roof areas, ridges, hips, valleys and gutters entirely free - no signup, no credit card, nothing saved.

Can I measure a roof remotely, without visiting the site?

Yes - that is exactly what this workflow is. Upload the plan image from anywhere, calibrate it, and measure. For re-roofs you will still want a site visit to assess existing condition, but the measurement itself can be done remotely from the drawing.

Can I measure a roof from a photo or image?

Yes, as long as the image is a plan or drawing you can calibrate: draw a line along any known true dimension, enter its length, and every measurement is to scale. A clear screenshot or export of a PDF plan works well.

Can I upload a PDF plan?

Not yet. The free tool accepts PNG, JPG and WebP images. Export or screenshot the PDF page as an image first - virtually any PDF viewer can do this.

Do I need an account?

No. Measuring and getting the full output is completely free with no signup. An account is only needed if you want to save a takeoff and continue into the QuoteCore+ app.

Can I measure a roof from satellite imagery?

Not with this tool - it measures from a plan or drawing you upload and calibrate, not from satellite or aerial imagery. If you have no plan at all, aerial measurement report services are the alternative - see the cost comparison for what they charge.

Does it handle pitch?

Yes. Every length is pitch-calculated, converting plan measurements to true roof measurements automatically. Pitch can be entered as degrees or a ratio like 6:12, and units as metric, imperial or roofing squares.

Ready to try it? Measure your roof plan online free - upload, set the scale, measure. No signup required. Or start a free QuoteCore+ trial for AI-assisted scans, saved components, and the full measure-to-invoice workflow.