Calculators
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Roofing take-off
Bundles, underlayment, IWS, ridge cap, starter strip — all from footprint + pitch.
Free · no signupInstant results
What it asks and what it returns
Data in, numbers out.
You give it
Material (architectural, 3-tab, standing seam, tile)
Horizontal footprint (SF) + pitch (rise/12)
Complexity (simple gable → multi-plane dormers)
Eave, rake, hip, valleys (LF) + penetrations
Attic SF for ventilation calculation
Tear-off, existing layers, building stories
Engine
It returns
Pitch multiplier + real slope area (SF + squares)
Material bundles per brand + waste per intersection
Ice & Water Shield rows (Pythagorean slope conversion)
Starter strip + ridge cap by LF
Attic ventilation NFA (intake / exhaust split)
Tear-off tonnage + dumpster cost
Labor with steep-pitch premium (7-9/12 +15%, 10+/12 +40%)
Behind the math
How it calculates.
formula.md
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// Converts horizontal footprint to slope area with the √(rise² + 144)/12 multiplier.
// Applies waste % per intersection type (rake/hip/valley) and calculates IWS on slope distance (36" horizontal at 12/12 = 51" slope = 2 rows).
// Attic ventilation follows code: NFA = attic SF ÷ 150, split half intake / half exhaust..
Same engine the Olynx app uses
When to use it
What it's good for.
01
Quote a residential roof without climbing to measure
02
Validate EagleView reports before billing insurance
03
Calculate tear-off tonnage to reserve the right dumpster
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