What does the asphalt shingle roof takeoff give for a typical job?

Opened at Footprint length 12 m · Footprint width 8 m · Roof pitch (rise per 12) 6 · Slope factor 1.12 · Ridge length 12 m · Eaves with ice-dam membrane 2 · Eave overhang 0.4 m · Exterior wall thickness 0.15 m · Ice-dam reach past the wall's inside face 0.61 m, it orders: Roofing Shingle, 118 m²; Roofing Underlayment, 1 roll; Roof Eave Ice Dam Protection Membrane Footprint, 31.1 m²; Roof Ridge Cap, 2 bundles; Ridge Vent Linear Footage, 12.6 m. Opened at Footprint length 39 ft · Footprint width 26 ft · Roof pitch (rise per 12) 6 · Slope factor 1.12 · Ridge length 39 ft · Eaves with ice-dam membrane 2 · Eave overhang 16 in · Exterior wall thickness 6 in · Ice-dam reach past the wall's inside face 2 ft: Roofing Shingle, 12.5 squares; Roofing Underlayment, 1 roll; Roof Eave Ice Dam Protection Membrane Footprint, 334 ft²; Roof Ridge Cap, 2 bundles; Ridge Vent Linear Footage, 40.9 ft. Every figure follows the dimensions you give it.

Which calculators does the asphalt shingle roof takeoff run?

5 calculators, one to a line: Roofing Shingle Calculator, Roofing Underlayment Calculator, Roof Eave Ice Dam Protection Membrane Footprint, Roof Ridge Cap Calculator, Ridge Vent Linear Footage Calculator. Each has a page of its own with its formula and its sources; the takeoff runs them all on one set of dimensions.

What does the asphalt shingle roof takeoff leave out?

5 things, each named on this page: The deck below, its condition and any repair to it; Valleys, hips, step flashing, chimneys, pipe boots and every other penetration; Drip edge, starter strip (the shingle row's allowance covers cutting only) and hip and ridge accessories other than the cap counted here; Intake ventilation at the soffit, which a ridge vent needs and without which it can pull air from the house; Tear-off, disposal and whatever the deck turns out to need.

Can I check a quote for this job against the takeoff?

Yes. The asphalt shingle roof quote check reads a quote's lines against these same calculators and your measurements, and reports what it leaves out, what it adds and what to ask. It reads quantities, never prices.

Job takeoff

Asphalt shingle roof takeoff

Shingles, underlayment, ice-dam membrane, ridge cap and ridge vent from the roof's footprint.

A takeoff is the trade word for the shopping list a job produces — every material, and how much of each, worked out by its own cited calculator.

9Measurements in
5Trades out

Give the job once

Every figure on the right follows these, in the units you choose.

Footprint lengthftAlong the ridge, on plan, to the drip edge: the wall-to-wall length plus the rake overhang at each end.Footprint widthftEave to eave, on plan, to the drip edge: the wall-to-wall width plus the overhang at each eave. Where each half of the roof is no wider on plan than the ice-dam strip (overhang + wall + reach, 1.16 m / 3 ft 10 in at the opening figures, so a gable under about 2.32 m / 7 ft 8 in across, a porch or entry hood), the membrane covers the whole slope: order it for the roof area, and the underlayment row drops out.Roof pitch (rise per 12)Rise over a run of 12. The shingle and ice-dam rows take it; the shingle calculator's own page offers flat, 4, 6, 8, 10 and 12, though asphalt shingles need a slope of at least 2 in 12.Slope factorRoof area ÷ plan area, for the pitch above: 1.118 at 6:12, 1.202 at 8:12, 1.414 at 12:12. The underlayment row takes it.Ridge lengthftRake drip edge to rake drip edge, the overhang at each gable end included.Eaves with ice-dam membrane2 on a gable where winters freeze, one down each long side. Set it to 0 where they do not, rather than unticking the ice-dam row: 0 removes that row and runs the underlayment over the whole roof, while an unticked row still leaves the underlayment short by the strip.Eave overhanginOn plan, from the drip edge to the outside face of the wall.Exterior wall thicknessinFrom the outside face of the wall to its inside face, siding to drywall, exterior insulation included. The ice-dam reach below is measured from the inside face, so the membrane crosses the wall as well as the overhang.Ice-dam reach past the wall's inside faceftHow far past the INSIDE face of the exterior wall the membrane must reach, on plan: 24 in (610 mm) under the US model code, IRC R905.1.2, more where a local rule says so.

Been given a quote for this job?

Paste it into the asphalt shingle roof quote check: each line is read against these same calculators — what it leaves out, what it adds, and what to ask.

Check the quote

Every trade, from those dimensions

5 of 5 trades chosenNot pricedNot in project

then change a dimension, and each line shows what moved.

	Trade	Quantity
	Roofing Shingle CalculatorShingles from the outline to the drip edge, at the pitch above. The 10% allowance covers cutting on a plain gable: the ridge cap is its own row and starter strip is bought separately, so raise it if you cut starters or caps from field shingles, or for hips and valleys. Base 11.34 squares Waste factor +1.13 squares · 10%, set by this takeoff Adjusted 12.47 squares Order 12.47 squares (no pack size recorded) Why this quantity? Base quantity11.34 squarescalculatorRoofing Shingle Calculator v1.0.1, headline with the waste factor at 0% Waste factor1.13 squaresworked outthe adjusted figure less the base, at 10% (set by the Asphalt shingle roof takeoff) Adjusted quantity12.47 squarescalculatorRoofing Shingle Calculator v1.0.1, headline with the waste factor at 10% Order quantity12.47 squaresworked out12.47 squares (no pack size recorded) Resting on Footprint length39 ftgivenyour footprint length Footprint width26 ftgivenyour footprint width Roof pitch (rise per 12)6givenyour roof pitch (rise per 12) Waste Factor (%)10%assumedset by the Asphalt shingle roof takeoff The waste factor: set by the Asphalt shingle roof takeoff. Change any other figure on the Roofing Shingle Calculator	12.47 squares
	Roofing Underlayment CalculatorUnderlayment over the SLOPED area, less the eave strip the ice-dam membrane covers; it laps onto the membrane rather than doubling it. To leave the membrane out, set the eaves with ice-dam membrane to 0 rather than unticking its row, or this row stays short by the strip. Where each half of the roof is no wider on plan than that strip (1.16 m / 3 ft 10 in at the opening figures), the membrane covers the whole slope and this row does not appear. Base 1 roll Overlap allowance +0 rolls · 10%, trade convention Adjusted 1 roll Order 1 roll, already whole Why this quantity? Base quantity1 rollcalculatorRoofing Underlayment Calculator v1.1.0, headline with the overlap allowance at 0% Overlap allowance0 rollsworked outthe adjusted figure less the base, at 10% (the calculator's working figure, a trade convention) Adjusted quantity1 rollcalculatorRoofing Underlayment Calculator v1.1.0, headline with the overlap allowance at 10% Order quantity1 rollworked out1 roll, already whole Resting on Footprint length39 ftgivenyour footprint length Footprint width26 ftgivenyour footprint width Slope factor1.12givenyour slope factor Eaves with ice-dam membrane2givenyour eaves with ice-dam membrane Eave overhang16 ingivenyour eave overhang Exterior wall thickness6 ingivenyour exterior wall thickness Ice-dam reach past the wall's inside face2 ftgivenyour ice-dam reach past the wall's inside face Overlap Allowance (%)10%assumedthe Roofing Underlayment Calculator's default The overlap allowance: the calculator's working figure, a trade convention. Change any other figure on the Roofing Underlayment Calculator	1 roll
	Roof Eave Ice Dam Protection Membrane FootprintAlong the eaves counted above — both eaves of a gable by default, twice the footprint length — from the drip edge to the reach past the wall's inside face, so its overhang box carries the overhang and the wall thickness together. Where freeze-thaw does not call for it, set the eaves with ice-dam membrane to 0 rather than unticking this row: the underlayment row subtracts this strip whenever that count is above 0. On a roof so narrow that the strip reaches the ridge (the underlayment row then drops out), this row counts the full strip anyway and can come to more than the roof: order no more than the roof area. Base 334.29 ft² Allowance +0 ft² · none added Adjusted 334.29 ft² Order 334.29 ft² (no pack size recorded) Why this quantity? Base quantity334.29 ft²calculatorRoof Eave Ice Dam Protection Membrane Footprint v1.0.1, headline Allowance0 ft²worked outnone: the calculator adds no allowance, and none was added Adjusted quantity334.29 ft²worked outthe base plus the allowance Order quantity334.29 ft²worked out334.29 ft² (no pack size recorded) Resting on Footprint length39 ftgivenyour footprint length Eaves with ice-dam membrane2givenyour eaves with ice-dam membrane Eave overhang16 ingivenyour eave overhang Exterior wall thickness6 ingivenyour exterior wall thickness Ice-dam reach past the wall's inside face2 ftgivenyour ice-dam reach past the wall's inside face Roof pitch (rise per 12)6givenyour roof pitch (rise per 12) Change any other figure on the Roof Eave Ice Dam Protection Membrane Footprint	334.29 ft²
	Roof Ridge Cap CalculatorCap shingles along the whole ridge, over the vent where there is one. Base 2 bundles Cut-end allowance +0 bundles · 10%, trade convention Adjusted 2 bundles Order 2 bundles, already whole Why this quantity? Base quantity2 bundlescalculatorRoof Ridge Cap Calculator v1.1.0, headline with the cut-end allowance at 0% Cut-end allowance0 bundlesworked outthe adjusted figure less the base, at 10% (the calculator's working figure, a trade convention) Adjusted quantity2 bundlescalculatorRoof Ridge Cap Calculator v1.1.0, headline with the cut-end allowance at 10% Order quantity2 bundlesworked out2 bundles, already whole Resting on Ridge length39 ftgivenyour ridge length Cut-End Allowance (%)10%assumedthe Roof Ridge Cap Calculator's default The cut-end allowance: the calculator's working figure, a trade convention. Change any other figure on the Roof Ridge Cap Calculator	2 bundles
	Ridge Vent Linear Footage CalculatorRidge vent under the cap, along the slot — an addition to the cap, not a replacement. Skip the row for an unvented ridge. Base 39 ft Waste allowance +1.95 ft · 5%, trade convention Adjusted 40.95 ft Order 40.95 ft (no pack size recorded) Why this quantity? Base quantity39 ftcalculatorRidge Vent Linear Footage Calculator v1.0.1, headline with the waste allowance at 0% Waste allowance1.95 ftworked outthe adjusted figure less the base, at 5% (the calculator's working figure, a trade convention) Adjusted quantity40.95 ftcalculatorRidge Vent Linear Footage Calculator v1.0.1, headline with the waste allowance at 5% Order quantity40.95 ftworked out40.95 ft (no pack size recorded) Resting on Ridge length39 ftgivenyour ridge length Waste Allowance (%)5%assumedthe Ridge Vent Linear Footage Calculator's default The waste allowance: the calculator's working figure, a trade convention. Change any other figure on the Ridge Vent Linear Footage Calculator	40.95 ft
	Roofing Shingle CalculatorShingles from the outline to the drip edge, at the pitch above. The 10% allowance covers cutting on a plain gable: the ridge cap is its own row and starter strip is bought separately, so raise it if you cut starters or caps from field shingles, or for hips and valleys. Base 107.33 m² Waste factor +10.73 m² · 10%, set by this takeoff Adjusted 118.06 m² Order 118.06 m² (no pack size recorded) Why this quantity?	118.06 m²
	Roofing Underlayment CalculatorUnderlayment over the SLOPED area, less the eave strip the ice-dam membrane covers; it laps onto the membrane rather than doubling it. To leave the membrane out, set the eaves with ice-dam membrane to 0 rather than unticking its row, or this row stays short by the strip. Where each half of the roof is no wider on plan than that strip (1.16 m / 3 ft 10 in at the opening figures), the membrane covers the whole slope and this row does not appear. Base 1 roll Overlap allowance +0 rolls · 10%, trade convention Adjusted 1 roll Order 1 roll, already whole Why this quantity?	1 roll
	Roof Eave Ice Dam Protection Membrane FootprintAlong the eaves counted above — both eaves of a gable by default, twice the footprint length — from the drip edge to the reach past the wall's inside face, so its overhang box carries the overhang and the wall thickness together. Where freeze-thaw does not call for it, set the eaves with ice-dam membrane to 0 rather than unticking this row: the underlayment row subtracts this strip whenever that count is above 0. On a roof so narrow that the strip reaches the ridge (the underlayment row then drops out), this row counts the full strip anyway and can come to more than the roof: order no more than the roof area. Base 31.12 m² Allowance +0 m² · none added Adjusted 31.12 m² Order 31.12 m² (no pack size recorded) Why this quantity?	31.12 m²
	Roof Ridge Cap CalculatorCap shingles along the whole ridge, over the vent where there is one. Base 2 bundles Cut-end allowance +0 bundles · 10%, trade convention Adjusted 2 bundles Order 2 bundles, already whole Why this quantity?	2 bundles
	Ridge Vent Linear Footage CalculatorRidge vent under the cap, along the slot — an addition to the cap, not a replacement. Skip the row for an unvented ridge. Base 12 m Waste allowance +0.6 m · 5%, trade convention Adjusted 12.6 m Order 12.6 m (no pack size recorded) Why this quantity?	12.6 m

Estimates, not a quote. Each row gives its base, the allowance on top, the adjusted figure and what to order; change an allowance on the row, or open its reasoning to see every figure it rests on. A trade's own page carries what it does not cover — open the one you are about to order against.

Labour and programme

Person-hours for the rows going in, from trade rules of thumb: a range for each piece of work, never a price.

Roofing Shingle14 h (8.1–32)
Roofing Underlayment3.7 h (2.2–7.4)
Roof Eave Ice Dam Protection Membrane Footprint1.6 h (0.9–3.1)
Ridge Vent Linear Footage2.4 h (1.2–4.8)

About 22 person-hours in all, between 12 and 48.

Trade by trade

Roofer2 roofers1½ days

About 1½ days, one trade after another at eight hours a day. Left out: drying and curing, deliveries, inspections, trades overlapping.

1 row carries no hours of its own

Roof Ridge Cap: counted with Roofing Shingle

Labour and programme

Person-hours for the rows going in, from trade rules of thumb: a range for each piece of work, never a price.

Roofing Shingle14 h (8.3–33)
Roofing Underlayment3.8 h (2.3–7.6)
Roof Eave Ice Dam Protection Membrane Footprint1.6 h (0.9–3.1)
Ridge Vent Linear Footage2.4 h (1.2–4.8)

About 22 person-hours in all, between 13 and 49.

Trade by trade

Roofer2 roofers1½ days

About 1½ days, one trade after another at eight hours a day. Left out: drying and curing, deliveries, inspections, trades overlapping.

1 row carries no hours of its own

Roof Ridge Cap: counted with Roofing Shingle

Setups you have saved

The build-up, the dimensions and any allowance you changed — kept on this device, and reusable on any job. Your prices are not copied in: they stay in your price book, so a setup never holds a stale one.

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How far does a budget go?

At your own prices, with this build-up unchanged.

Solve forBudget

About this job

A roof is bigger than the building it sits on, and that is the first thing an estimate has to get right. The footprint here is the roof's outline on plan measured to the drip edge, overhangs included, not the wall line you can tape from the ground; the roof area is that outline multiplied by a slope factor, which at a 6:12 pitch is about 1.12 and at 12:12 is over 1.41. The shingle and ice-dam rows take the pitch you enter and apply the slope themselves. The underlayment row cannot — it takes an area, so the slope factor here must be the one for that same pitch.

The ice-dam row is a climate question wearing a quantity's clothing. Where the winter produces freeze-thaw, the membrane has to reach far enough up the slope to pass the inside face of the exterior wall, which is a depth measured from the eave rather than a percentage of the roof. In a warm climate the row is not needed at all, and the honest thing is to exclude it rather than to order it: set the eaves with ice-dam membrane to 0, rather than unticking the row, and it drops out with the underlayment made whole again.

The ice-dam row also runs along every eave, not one. A gable has two, one down each long side, so the row below takes the footprint length once for each; a hip roof has eaves on all four sides, the whole perimeter, which this gable takeoff does not model. The underlayment starts where the membrane stops, so its row is the sloped area less the membrane strip rather than both over the same eave.

The ridge is two products, and the vent does not replace the cap. A ridge vent goes down first, over a slot cut back from the ridge board; the cap shingles go on last and cover the whole ridge, over the vent where there is one. Choosing a vent adds a line to the order rather than swapping one, and because the slot stops short of the ridge ends, a vent row sized to the full ridge carries a little spare.

How each line reads

Base: What the calculator gives for these dimensions, before anything is added.
Allowance: Cutting waste, a lap or spare stock — named, with where it comes from, and changeable on the row.
Adjusted: The base with its allowance on top.
Order: What to buy: the adjusted figure in whole boards, bags, rolls or lengths.

The order this happens in

Quantities do not tell you the sequence, and on this job the sequence is where the money goes wrong.

Strip to the deck and check it — a re-roof over rot is a re-roof done twice.
Fit the drip edge at the eave, then the ice-dam membrane, then the drip edge at the rake over the top of it.
Lay the underlayment up the slope, lapped so water runs over each joint rather than into it.
Snap the course lines rather than trusting the shingle's own alignment marks.
Cut the ridge slot before capping, and only where the vent will run.
Cap the ridge last, working away from the prevailing wind.

What this takeoff does not cover

The deck below, its condition and any repair to it.
Valleys, hips, step flashing, chimneys, pipe boots and every other penetration — each is a detail rather than an area.
Drip edge, starter strip (the shingle row's allowance covers cutting only) and hip and ridge accessories other than the cap counted here.
Intake ventilation at the soffit, which a ridge vent needs and without which it can pull air from the house.
Tear-off, disposal and whatever the deck turns out to need.

Quote check

Been given a quote for this job?

Paste it into the asphalt shingle roof quote check. Every line of it is read against these same calculators and your measurements. Quantities only, never prices.

Check the quote Every quote check

What it leaves out
Every line this takeoff has that nothing on the quote reads as.
What it adds
Labour, removal, hire, fees — each named for what it is.
What to ask
One list of questions, ready to copy. Never a verdict.

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Frequently asked questions

What does the asphalt shingle roof takeoff give for a typical job?: Opened at Footprint length 12 m · Footprint width 8 m · Roof pitch (rise per 12) 6 · Slope factor 1.12 · Ridge length 12 m · Eaves with ice-dam membrane 2 · Eave overhang 0.4 m · Exterior wall thickness 0.15 m · Ice-dam reach past the wall's inside face 0.61 m, it orders: Roofing Shingle, 118 m²; Roofing Underlayment, 1 roll; Roof Eave Ice Dam Protection Membrane Footprint, 31.1 m²; Roof Ridge Cap, 2 bundles; Ridge Vent Linear Footage, 12.6 m. Opened at Footprint length 39 ft · Footprint width 26 ft · Roof pitch (rise per 12) 6 · Slope factor 1.12 · Ridge length 39 ft · Eaves with ice-dam membrane 2 · Eave overhang 16 in · Exterior wall thickness 6 in · Ice-dam reach past the wall's inside face 2 ft: Roofing Shingle, 12.5 squares; Roofing Underlayment, 1 roll; Roof Eave Ice Dam Protection Membrane Footprint, 334 ft²; Roof Ridge Cap, 2 bundles; Ridge Vent Linear Footage, 40.9 ft. Every figure follows the dimensions you give it.
Which calculators does the asphalt shingle roof takeoff run?: 5 calculators, one to a line: Roofing Shingle Calculator, Roofing Underlayment Calculator, Roof Eave Ice Dam Protection Membrane Footprint, Roof Ridge Cap Calculator, Ridge Vent Linear Footage Calculator. Each has a page of its own with its formula and its sources; the takeoff runs them all on one set of dimensions.
What does the asphalt shingle roof takeoff leave out?: 5 things, each named on this page: The deck below, its condition and any repair to it; Valleys, hips, step flashing, chimneys, pipe boots and every other penetration; Drip edge, starter strip (the shingle row's allowance covers cutting only) and hip and ridge accessories other than the cap counted here; Intake ventilation at the soffit, which a ridge vent needs and without which it can pull air from the house; Tear-off, disposal and whatever the deck turns out to need.
Can I check a quote for this job against the takeoff?: Yes. The asphalt shingle roof quote check reads a quote's lines against these same calculators and your measurements, and reports what it leaves out, what it adds and what to ask. It reads quantities, never prices.

Asphalt shingle roof takeoff

Give the job once

Every trade, from those dimensions

Labour and programme

Trade by trade

Labour and programme

Trade by trade

Setups you have saved

How far does a budget go?

About this job

How each line reads

The order this happens in

What this takeoff does not cover

Been given a quote for this job?

Other job takeoffs

External wall finish

Insulate a floor

Fibre cement siding

Frequently asked questions