Roofing Calculators
Every roofing estimate starts with one multiplication most people skip: footprint times the pitch slope factor. Guess 4/12 when it's really 8/12 and everything downstream is off by 14 percent. These calculators do the geometry exactly, then talk materials the way suppliers sell them: bundles at real coverage, panels at net width, waste at the published 10 to 15 percent convention with the driver named.
- Measure the Roof
- Shingles, Metal, and Materials
- Tear-Off and Cleanup
- What a Roof Costs
- Prices
- Worth Reading
Not Sure Where to Start?
Free Roofing Calculator (Square Feet) is the one most people need. Area is the number every other roofing decision hangs off. Get it from footprint and pitch here, then carry it into the material and cost tools.
Measure the Roof
From footprint and pitch to true area, including hip geometry and framing lengths. The slope factor does the work; these tools make it visible.
- Free Roofing Calculator (Square Feet)Get roof square footage and squares from footprint and pitch, free: slope-factor math shown, honest waste ranges given instead of one fake precise number.
- Satellite Roofing CalculatorNot an aerial-imagery report: this tool computes roof area from footprint and pitch honestly, and explains when a paid satellite measurement is worth it.
- Roof Framing CalculatorGet exact common rafter length from run, rise, and overhang using pure slope-factor geometry. Rafter sizing stays with your code's IRC R802 span tables.
- Hip Roof Framing CalculatorHip rafters run longer per foot of run than common rafters, so this calculator uses the larger hip factor to keep your lengths from being quietly understated.
Shingles, Metal, and Materials
Squares to bundles, panel runs at net coverage width, nails by the box. Purchase units, not abstractions.
- Roofing Material CalculatorRoofing material takeoff done right: shingle bundles plus ridge cap, starter strip, and underlayment as separate line items, honest ranges instead of one number.
- Metal Roofing CalculatorRoof area from your footprint and pitch (slope factor √(1+(rise/12)²)), panel counts from real coverage widths, and the waste drivers named. No fake precision.
- Steel Roofing CalculatorSteel roof area from footprint and pitch, plus the two steel-specific traps (net coverage width and low-slope end-laps): honest ranges, not fake precision.
- Commercial Roofing CalculatorCommercial roof area from footprint and a low-slope pitch default, with the slope-factor math shown: honest ranges for squares, not one fabricated total.
- Roofing Nail CalculatorNail count from your actual square count and fastening pattern: 4 vs 6 nails/shingle changes the total by 50%, shown honestly instead of one flat figure.
Tear-Off and Cleanup
Old shingles weigh 200 to 250 pounds per square per layer. Size the dumpster before the first one comes off.
What a Roof Costs
Material systems compared honestly, labor modeled from published wage data, every figure dated and banded.
- Asphalt Shingle Roofing Cost CalculatorBundle takeoff is exact math; labor is what makes “cost per square” vary 2-3x by region. This models both honestly as a planning band (see /methodology/).
- Metal Roofing Price CalculatorNo flat “$X per square” claim: this models metal roofing cost as burdened roofer labor plus material takeoff, an honest planning band. See /methodology/.
- TPO Roofing Cost CalculatorTPO seams are hot-air welded, not taped: that skill requirement shows up in labor, not material. A modeled cost band, not one flat number. See /methodology/.
- EPDM Roofing Cost CalculatorEPDM is a low-slope membrane sold by the roll, not the bundle. Cost here is a modeled labor band on burdened wage, not one flat $/sf claim: see /methodology/.
- Roofing Labor Cost CalculatorRoofing labor cost modeled as burdened wage times markup, not a flat $/square guess. Workers comp swings roofing cost more than region does. See /methodology/.
What the Prices Are Doing
At the producer level, asphalt felts & coatings costs 4.6% more than a year ago, steel mill products 22.5% more, final demand construction 5.2% more (BLS Producer Price Index, July 2025 to July 2026, unadjusted 12-month change). Shingles ride asphalt and steel roofing rides the mill price, and the two have been moving in opposite directions this year. Which system you price first matters more than usual. Full picture on the Cost Index.
| Item | Sampled price |
|---|---|
| Owens Corning Oakridge Architectural Shingles (32.8 sf/bundle) | $44.97 / bundle |
| Owens Corning TruDefinition Duration (32.8 sf/bundle) | $46.97 / bundle |
| Owens Corning Starter Strip Plus (105 lin ft) | $62.47 / roll |
Worth Reading First
Every calculator above ships with externally validated test values and sourced assumptions. See the methodology page for the full ledger.