iOS App · Pro Tools · Roofing
RoofingCalc Pro — the roofing calculator that works on the roof
Four calculators in one free app: roof area and materials, pitch, rafter length and job cost. Punch in measurements, get squares, bundles, rafter lengths and a job price, then export a clean one-page PDF for the client or the claim file — fully offline, with big tap targets for gloved hands. No ads, no subscription, no account.
Overview
What is RoofingCalc Pro?
RoofingCalc Pro is a professional roofing calculator for roofers, contractors, estimators, insurance adjusters, apprentices and DIY homeowners who need fast, correct roofing math on the job site — even with no signal.
Roofing math is not hard, but it is easy to get wrong on a ladder in the sun: converting footprint to sloped area, area to squares, squares to bundles, run and pitch to rafter length, and all of it to a price with waste. RoofingCalc Pro does those conversions instantly and keeps every calculation in history.
It is deliberately simple: no aerial measurement subscriptions, no per-report fees, no CRM. You bring the measurements; it gives you the numbers and a PDF. Everything runs locally on the device — it works on the roof, in rural areas, anywhere.
Completely free. Every feature is included — no hidden costs, no premium tier, no ads, no popups. RoofingCalc Pro collects zero data: no account, no analytics.
Audience
Who RoofingCalc Pro is built for
Professional roofers
Area, materials and rafter lengths on every job; PDF estimates from the truck.
General contractors
Quick, reliable roofing math when roofing isn't your primary trade.
Insurance adjusters
Roof area and replacement cost for storm-damage claims, with a PDF for the file.
Roofing apprentices
Learn the formulas — slope factor, hip/valley factor — while getting accurate answers.
DIY homeowners
Estimate materials before calling contractors, so you can read their quotes with confidence.
Anyone without signal
Everything runs on the device. No internet, no problem.
Capabilities
Four calculators, one free app
- Roof area & materials. Enter footprint dimensions and pitch. Get roof area in square feet and in roofing squares (1 square = 100 sq ft), plus shingle bundles, underlayment rolls and ridge cap pieces.
- Pitch calculator. Enter rise and run to get pitch as a ratio (e.g. 6/12), in degrees and as a percentage — or enter any one value and calculate the others. Slope factor and hip/valley factor are shown for your own calculations.
- Rafter length. Enter run and pitch to get common, hip and valley rafter lengths using the correct geometric factors. Cut lumber right the first time.
- Job cost estimator. Enter roof area, material cost per square, labor rate and waste factor for a full breakdown: materials, labor, waste allowance and total job price.
- PDF export. A professional one-page report with all calculations — send it to the client, adjuster or office from the job site.
- History, units and job-site UI. Every calculation saved automatically and searchable by date or project. Imperial or metric with one tap. High-contrast green-on-dark theme readable in bright sun; big tap targets for gloves.
Workflow
How to estimate a re-roof in five steps
A typical re-roof estimate with RoofingCalc Pro, from tape measure to PDF.
- Measure the footprint and pitch.Measure the building footprint including overhangs, and get the pitch — rise over a 12-inch run. If you only have degrees or percent, the pitch calculator converts it.
- Calculate area and squares.Enter dimensions and pitch in Roof Area & Materials. You get sloped area in square feet and roofing squares. Example: a 2,000 sq ft footprint at 6/12 pitch (slope factor ≈ 1.118) is about 2,236 sq ft, or ≈ 22.4 squares.
- Get materials.Read off shingle bundles, underlayment rolls and ridge cap. Standard 3-tab and many architectural shingles run three bundles per square — check the manufacturer's coverage for the product you use.
- Price the job.In the Job Cost Estimator, enter material cost per square, labor rate and a waste factor (commonly around 10% for simple gables and more for complex hip roofs with valleys). You get materials, labor, waste and total.
- Export the PDF.Generate the one-page report and send it to the client or adjuster. The calculation stays in history for when the client calls back.
Comparison
RoofingCalc Pro vs GAF QuickMeasure vs RedX Roof vs Construction Master Pro vs Roof Pitch Factor
Based on each app's public App Store listing in October 2026. These tools do different jobs: GAF QuickMeasure sells aerial measurement reports, RedX Roof is a 3D framing and blueprint tool, Construction Master Pro is the classic feet-inch-fraction construction calculator, and Roof Pitch Factor measures pitch with the camera. RoofingCalc Pro is the free, offline, roofing-only calculator with PDF export.
| RoofingCalc Pro | GAF QuickMeasure | RedX Roof | Construction Master Pro | Roof Pitch Factor | |
|---|---|---|---|---|---|
| Price | Free, all features | Reports from $18 each | Pro features paid | Free | Free |
| Roof area + squares | ✓ | ✓ measured from aerial | ✓ | ✓ | — |
| Bundles / underlayment / ridge cap | ✓ | partial (report lengths) | material lists | ✓ lumber / materials | — |
| Pitch conversions (ratio / degrees / %) | ✓ | ✓ | ✓ | ✓ | ✓ via camera |
| Common / hip / valley rafters | ✓ | — | ✓ + jack rafters, 3D | ✓ | — |
| Job cost estimate | ✓ | — | — | partial | — |
| PDF export | ✓ | ✓ report | ✓ blueprints | — | — |
| Works offline | ✓ | — | partial | ✓ | ✓ |
| Measures the roof for you | — | ✓ | — | — | pitch only |
| No ads / no data collected | ✓ | — | — | — | — |
Honest read: Pick GAF QuickMeasure when you need measurements without climbing. Pick RedX Roof for full 3D framing plans and cut lists. Pick Construction Master Pro if you want one calculator for every trade. Pick RoofingCalc Pro when you already have measurements and want area, materials, rafters, a price and a PDF — free, offline, with no account.
In practice
Situations where RoofingCalc Pro helps
Illustrative examples of how the features fit into a day, not user reviews.
The storm-damage claim
An adjuster inspects hail damage on a rural property with no signal. She enters the footprint and pitch, calculates replacement area and cost, and exports the PDF for the claim file before leaving the driveway.
The Saturday bid
A small roofing crew owner quotes three jobs on a Saturday. Each takes minutes: measure, calculate squares and bundles, apply his labor rate and a 12% waste factor, and send the PDF from the truck.
Cutting rafters for a shed
A homeowner framing a 10×12 shed with a 4/12 roof uses the rafter calculator for common rafter length and double-checks the pitch in degrees for the miter saw.
Checking a quote
Before hiring a roofer, a homeowner estimates squares and material quantities herself — and walks into the quote conversation knowing roughly what the job requires.
Pricing
Free. Every feature. No catch.
RoofingCalc Pro
$0 forever
- All four calculators
- PDF export and calculation history
- Imperial & metric, fully offline
- No ads, no subscription, no account
- Zero data collected
RoofingCalc Pro is free on iPhone and iPad. There are no in-app purchases, no per-report charges and no premium tier.
Questions
Frequently asked questions
Is RoofingCalc Pro really free?
Yes. Every feature is included — no hidden costs, no per-report charges, no premium tier, no ads and no popups.
Does it work without internet?
Yes. All calculations run locally on your device, so it works on the roof, in rural areas and anywhere without signal.
How many squares is my roof?
One roofing square is 100 square feet of roof surface. Multiply the footprint area by the slope factor for your pitch to get sloped area, then divide by 100. RoofingCalc Pro does this for you from footprint dimensions and pitch.
How many bundles of shingles per square?
Many standard 3-tab and architectural shingles need three bundles per square, but coverage varies by product — always check the manufacturer's label. RoofingCalc Pro calculates bundles, underlayment rolls and ridge cap from your roof area.
How do I convert roof pitch to degrees?
Pitch is rise over a 12-inch run. Degrees = arctangent(rise ÷ 12). For example, 6/12 ≈ 26.6°, 4/12 ≈ 18.4°, 12/12 = 45°. The pitch calculator converts between ratio, degrees and percentage in either direction.
Can it calculate hip and valley rafters?
Yes. Enter run and pitch to get common, hip and valley rafter lengths using the correct slope and hip/valley factors.
Can I send an estimate to a client?
Yes. Export a professional one-page PDF with all calculations and send it from the job site.
Does it measure my roof from satellite images?
No. RoofingCalc Pro is a calculator — you enter the measurements. For aerial measurement, services like GAF QuickMeasure or EagleView sell reports.
What data does RoofingCalc Pro collect?
None. No account, no analytics, no ads. Your calculations stay on your device.
Is it safe to measure a roof myself?
Roof work is dangerous. Use proper fall protection and never go on a wet, icy or steep roof without training and equipment. Measuring from the ground or from plans is often safer for homeowners.
Roofing math in seconds — free, offline, no account.
More from the studio
Related Loveiko Labs apps
Estimates, not engineering. RoofingCalc Pro provides calculations for estimating purposes. Always verify measurements, check manufacturer coverage and installation requirements, and follow local building codes. Structural decisions, including rafter sizing and spans, should be confirmed against code tables or by a qualified professional.
Safety. Working on roofs is hazardous. Use appropriate fall protection and follow OSHA or local safety rules.