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Roofing calculators: 13 free tools

Thirteen tools for measuring a roof, deciding what to do with it, checking the price, the loan or the claim, and reading the quotes and contract. Each shows its method and sources. None asks for an email.

13 tools no email, method shown Every figure comes from a named source, or from math on numbers you type. HyreRoof holds no price data and does not sell or install roofs.

Pick the tool that matches the decision in front of you. Three measure the roof. Two help you decide between repair, replacement and waiting.

Three help choose the covering and check the attic. Three check a price, a loan or a hail claim against your own figures. Two check your quotes and your contract before you sign.

None of them publishes an average price. The cost tools multiply the rates on your bid.

Measure the roof

Area, pitch and drainage: the numbers every quote is built on.

Roofing squares calculatorFootprint and pitch to squares and bundles, with the formula shown.Open the toolRoof pitch calculatorRise and run to degrees, and the code line the slope sits on.Open the toolGutter size calculatorStorm flow against the plumbing code’s gutter and downspout ratings.Open the tool

Repair, replace or wait

Something is leaking or the roof is old, and the question is whether to spend on it again.

Repair vs replace calculatorFive written-down thresholds, counted from your quotes.Open the toolRoof life calculatorA remaining-life range from what you can see. Never a single year.Open the tool

Choose what goes back on

The covering, whether paying more up front returns anything, and the attic under it.

Roof material selectorA covering for your climate and pitch, and when that pick is wrong.Open the toolMetal vs asphalt calculatorCost per year and break-even, from your two quotes.Open the toolAttic ventilation calculatorThe IRC vent area, split into intake and exhaust, then counted.Open the tool

Price, pay and claim

What your bid adds up to, what the loan costs, and what a storm claim pays.

Roof replacement cost calculatorYour bid’s rate times your squares, plus deck and fixed costs.Open the toolRoof financing calculatorThe real APR on a roof loan, measured against the cash price.Open the toolHail claim estimatorDepreciation, deductible and the first check, before an adjuster visits.Open the tool

Check the quotes and the contract

Before you sign: are the bids pricing the same job, and does the contract protect you?

Roofing estimate comparisonUp to three quotes on the same lines and the same price per square.Open the toolContract red flag checkerTick what the contract says; see the flags, each tied to an agency rule.Open the tool

What these tools will and will not do

  • The method is on the page

    Each tool states its arithmetic or its rules, and the source behind any fixed number, so you can see an assumption and change the input.

  • Nothing is emailed or stored

    The tools run in your browser. No email wall and no form in front of a result.

  • They can tell you to do nothing

    We do not sell roofs, so a tool here can conclude that a repair is right, the roof is fine, or metal will not pay back for you.

  • Ranges stay ranges

    Where the evidence is a range, the answer is a range.

  • No national average prices

    We found none traceable to a published method. The cost tools use your figures.

  • Never measure from the roof

    Every input these tools need can be taken from the ground, the attic or a document.

Which tool answers which question, and what each will not tell you

The last column matters most. Knowing what a tool cannot see stops you acting on a number it never produced.

If you are askingStart hereWhat it will not tell you
How big is my roof?Roofing squares calculatorWhat a square costs, how many layers are on the deck, or the state of the sheathing.
What pitch is it, and what does that change?Roof pitch calculatorWhether your jurisdiction adopted the code edition we quote.
Are my gutters big enough?Gutter calculatorYour rainfall intensity (a NOAA lookup you type in) or where the downspouts should go.
Do I repair or replace?Repair vs replace calculatorThe roof’s remaining life. You supply it, from someone who has inspected the roof.
How much life is left?Roof life calculatorHow well it was installed, or whether the sealant strip still holds.
What covering should go on?Roof material selectorWhether your framing will carry tile or slate. That is for an engineer.
Will metal pay for itself?Metal vs asphalt calculatorEnergy savings, resale premium or insurance discounts. We found no figures we could source.
Is my attic ventilated?Ventilation calculatorWhether your soffit intake is actually open. That takes a look in the attic.
What should this cost?Roof cost calculatorA national average price. It multiplies the rates on your bid.
What does the roof loan really cost?Roof financing calculatorThe size of any markup, until you get the cash price in writing.
What will a hail claim pay?Hail claim estimatorWhether the roof is damaged, or what your insurer will decide.

HyreRoof does no roofing work, ranks no contractors, holds no bids, prices or claims, and takes no referral fee.

The sources underneath the eleven calculators

The tools share a handful of sources, and each page quotes them rather than paraphrasing.

Cumulative change since 20000Roofing materials (BLS PPI)255%Roofing wages (BLS CES)109%All consumer prices (BLS CPI)87%% change, 2000 to 2025Cumulative change since 20000Materials (PPI)255%Wages (CES)109%Prices (CPI)87%% change, 2000 to 2025
Cumulative change since 2000. Three BLS series. The two halves of a roofing bid have not moved together.US Bureau of Labor Statistics through 2025. The full study, with every series ID →

The slope factor

Roof surface equals footprint times √(1 + (rise ÷ 12)²). It is geometry, not an estimate. It runs through the squares, pitch and cost tools.

The IRC sections we read

Ventilation. IRC 2021 R806.2, Minimum vent area: “The minimum net free ventilating area shall be 1/150 of the area of the vented space.” And IRC 2021 R806.3, Vent and insulation clearance: “Blocking, bridging and insulation shall not block the free flow of air.”

Asphalt slope limits. “Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (17-percent slope) or greater.” Double underlayment is required on slopes between 2:12 and 4:12.

Water at the edge. “A drip edge shall be provided at eaves and rake edges of shingle roofs,” and the ice barrier “not less than 24 inches (610 mm) inside the exterior wall line of the building.”

Fire. IRC 2021 R902.1, Roof covering materials: “Classes A, B and C roofing required by this section to be listed shall be tested in accordance with UL 790 or ASTM E 108.”

This is model code. Adoption and amendment are local, and your jurisdiction may have adopted another edition. Confirm with your building department before relying on it.

The ASTM wind classes

ASTM D3161 is a fan-induced wind-resistance test method. It classifies shingles as Class A, D or F, with wind speed resistances of 60 mph, 90 mph and 110 mph respectively.

ASTM D7158 is an uplift force / uplift resistance method for shingles that carry factory-applied self-sealing strips. It classifies them as Class D, G or H, with basic wind speeds of 115, 150 and 190 mph.

HyreRoof analysis: a wind class describes a tested assembly, not a shingle. The rating assumes the fastening pattern, the deck and the sealing the test used.

A Class H shingle nailed high, nailed with four instead of six, or laid in cold weather so the sealant strip never bonded, is not a Class H roof.

The fastening line on a bid is a wind line, so read it as one.

astm.org returned HTTP 403 to automated retrieval on September 5, 2026. The classes and speeds above were read at NRCA’s Professional Roofing, the trade body’s own explanation of the standards, and are cited that way. We do not quote the standards themselves.

The federal data behind every price statement

Since 2000, BLS producer prices for roofing materials are up 255%, roofing wages 109%, and consumer prices 87%.

Hail exposure comes from 43,386 NOAA severe hail reports for 2021–2025, 6,848 of them in Texas. Housing age comes from ACS table B25034. Both are worked through in our research.

The safety line

29 CFR 1926.501(b): “Each employee engaged in residential construction activities 6 feet (1.8 m) or more above lower levels shall be protected by guardrail systems, safety net system, or personal fall arrest system unless another provision in paragraph (b) of this section provides for an alternative fall protection measure.”

So every measuring instruction on this site works from the ground, a window, the attic or a photo.

The order to use them in, if you are replacing a roof

The tools work better in sequence. It takes an evening.

  1. 1
    Find the pitch, plane by plane

    From the attic with a level, or from a square-on photo of a gable. It decides which coverings are allowed and how much material the roof takes.

  2. 2
    Turn the footprint into squares

    Once per plane, then add. Compare bidders on this number before price.

  3. 3
    Look in the attic

    Daylight at the eaves, stains on the sheathing, blocked soffit bays, bath fans venting into the space. Ten minutes that can change the job.

  4. 4
    Decide repair or replace

    With a remaining-life figure from someone who inspected the roof. The answer can be repair, or not yet.

  5. 5
    Read your declarations page

    Settlement basis, roof endorsement, and the wind/hail deductible, dollar or percentage.

  6. 6
    Choose the covering, then the spec under it

    Wind class, fastening, underlayment, edge metal and ventilation.

  7. 7
    Send every bidder one scope sheet

    Three quotes against one scope compare. Three against three assumptions do not.

  8. 8
    Do all of it from the ground

    OSHA rules bind employers, not homeowners, but the line still applies. A trained roofer may not work above six feet without fall protection. Look from the ground, a window or the attic, or use a photo or a drone.

Four numbers we do not publish

Each would make these pages look more useful. We could not source any of them to something we would stand behind.

A national average roof price. We found none traceable to a measurement with a published method. The cost tools multiply your own rates instead.

A resale premium for any covering. We found no figure with a published method.

An energy saving from a roof color or material. It depends on reflectance, climate, insulation, ducts and ventilation. One national percentage would be the assumptions talking.

An insurance discount for an impact-rated roof. It is set carrier by carrier and state by state. Call yours.

HyreRoof holds no dataset of claims, settlements or adjuster decisions, and does not act as a public adjuster or contractor. Nothing here is legal, insurance or engineering advice; your policy language and your state’s regulations are the binding version.

Terms the tools share

Square
100 square feet of roof surface, not of footprint. The unit materials, labor and bids are priced in.
Pitch and slope factor
Rise over a 12-inch run, and the multiplier √(1 + (rise ÷ 12)²) from footprint to roof area.
Plane
One continuous roof surface at one pitch. Each needs its own calculation.
Net free ventilating area
Open area after screens, louvers and baffles. A product property, printed on the datasheet.
Wind class
An ASTM D3161 or D7158 class. It describes a tested assembly, and the letter means nothing without the standard.
Assembly
Covering, underlayment and deck as a listed combination. Fire and wind ratings attach to it.
Actual cash value and replacement cost
The two settlement bases. Actual cash value subtracts depreciation for the roof’s age.
Percentage deductible
A wind or hail deductible set as a share of the dwelling limit. It does not scale with the loss.
Model code
The published IRC or IPC text before local adoption. Your building department has the binding version.

Questions about these tools

Do these roofing tools cost anything?
No. All thirteen cost nothing and ask for no email address. The result appears on screen and the method is printed on the page.
Which tool should I start with?
Start from the decision. Measuring: squares and pitch. Something leaking: repair vs replace. Choosing a covering: the material selector. Checking a bid: the cost calculator or the estimate comparison. Before signing: the contract red flag checker. After a storm: the hail claim estimator.
Why do roofs cost more than they used to?
Roofing materials have outpaced general inflation. The BLS producer price index for roofing materials is up 255% since 2000, against 87% for consumer prices. An old price is not a fair comparison.
Do these tools give me a price for my roof?
No. They multiply the figures you type from your bid. We publish no national average because we found none traceable to a published method.
Where do the fixed numbers come from?
The IRC, OSHA, ASTM classes read at NRCA, BLS price series, 43,386 NOAA hail reports (6,848 in Texas) and Census housing data. Each tool lists its sources with retrieval dates.
Does HyreRoof sell or install roofs?
No. We do not sell, install or inspect roofs, and matching with roofers is not live yet. That is why these tools can say the answer is to do nothing.

Sources and methodology

Figures dated September 5, 2026. Last reviewed .

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