API · /roofing-api

Roofing Calculator API

healthy 4,431 Subscribers

Roofing geometry as an API, computed locally and deterministically. The pitch endpoint converts a roof pitch between every common form — rise-over-run (such as 6:12), the angle in degrees, the percent slope, and the slope multiplier (the factor that turns a flat footprint into the real sloped area). The rafter endpoint computes the rafter length from the horizontal run and the pitch — that is, the hypotenuse √(run² + rise²) — with an optional overhang projected along the slope. The area endpoint computes the true sloped roof area from the building footprint (entered directly or as length × width) and the pitch, adds a wastage allowance, and reports the number of US roofing squares and shingle bundles needed. Everything is computed locally and deterministically, so it is instant and private. Lengths are unit-agnostic — use consistent units — while the squares and bundles figures assume US roofing squares of 100 square feet, so pass the footprint in square feet for those. Ideal for roofing contractors and estimators, construction and DIY tools, solar-install planning, and quoting software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is roof geometry; for paint, tile, concrete and brick quantities use a construction-calculator API.

#roofing #roof-pitch #rafter #construction #estimating #developer-tools

api.oanor.com/roofing-api

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Machine-readable spec so AI agents can integrate this API.

/api/roofing-api/openapi.json

/api/roofing-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 86 ms; Server probes · 24h
Subscribers: 4,431; active
Total calls: 44; last 7 days

Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

10,235 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
10,235 calls/month
2 req/sec
Pitch + rafter + area
No credit card

Starter

€11.75 /month

19,850 calls / month
8 requests / second
Hard cap (429 above quota, no overage)
19.85k calls/month
8 req/sec
Squares + shingle bundles
Email support

Pro

€31.65 /month

248,500 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
248.5k calls/month
20 req/sec
Roofing / estimating pipelines
Priority support

Mega

€69.65 /month

1,285,000 calls / month
50 requests / second
Hard cap (429 above quota, no overage)
1.285M calls/month
50 req/sec
Platform scale
Dedicated SLA

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Roof Pitch API

Roofing geometry as an API, computed locally and deterministically. The pitch endpoint converts freely between the three ways trades describe a roof slope — the pitch as rise per 12 of run (the X:12 notation), the angle in degrees and the slope as a percentage — using angle = atan(pitch/12); a 6:12 roof is 26.57° and a 50 % slope, and it also returns the pitch multiplier √(1 + tan²) that scales a flat plan length to the true along-slope length. The rafter endpoint computes the common rafter length from the horizontal run and the pitch, rafter = √(run² + rise²) with rise = run·tan(angle), and adds the along-slope length of an optional horizontal overhang — a 12-unit run at 6:12 needs a 13.42-unit rafter. The area endpoint converts a flat building footprint into the actual sloped roof surface area, footprint / cos(angle), the figure you need to order shingles, membrane or underlay; a 100 m² footprint under a 6:12 roof is about 111.8 m². Lengths are unit-agnostic — use a consistent unit. Everything is computed locally and deterministically, so it is instant and private. Ideal for roofing, construction, contractor-estimating, home-improvement, solar-install and architecture app developers, take-off and material-ordering tools, and trade software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is roofing-specific geometry; for a general grade or gradient use a slope API.

api.oanor.com/roofpitch-api

Snow Load API

Roof snow-load maths as an API, computed locally and deterministically using the ASCE 7 method. The roof endpoint turns a ground snow load into the design roof snow load: the flat-roof load is pf = 0.7 · Ce · Ct · Is · pg, using the exposure, thermal and importance factors, and the sloped-roof load is ps = Cs · pf, where the slope factor Cs follows the warm-roof all-surfaces curve (1.0 up to 30°, falling linearly to 0 at 70°) or a value you supply. It reports every load in kilopascals, pascals, pounds per square foot and kilograms per square metre, and — if you give a roof area — the total load in kilonewtons, kilograms, tonnes and pounds. The depth endpoint converts a measured snow depth and a density (given directly or by snow type, from fresh ~100 to ice ~917 kg/m³) into a load. The convert endpoint converts a snow load between kPa, psf, kg/m², Pa and psi. Depths accept millimetres, centimetres, metres, inches or feet. Everything is computed locally and deterministically, so it is instant and private. An engineering aid, not a code-stamped design — always confirm against the governing local code with a qualified engineer. Ideal for structural and roofing tools, building-code and permitting apps, solar-install and carport planners, and winter-risk calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is roof snow-load engineering; for roof pitch and area geometry use a roofing API and for beam reactions use a beam API.

api.oanor.com/snowload-api

ADA Ramp API

ADA wheelchair-ramp maths as an API, computed locally and deterministically — the run, landing and slope numbers a builder or accessibility planner sizes a ramp by. The rule the ADA fixes is 1 inch of rise per 12 of run, a maximum 8.33 % slope, so the ramp endpoint turns a rise into the ramp: run = rise × 12 (or × 16 / × 20 for a gentler grade if you have the room), plus the level landings the code requires — a 5-foot landing top and bottom and another between runs whenever the rise exceeds 30 inches — and the total length end to end, so a 24-inch rise needs a 24-foot run and 34 feet overall, while a 36-inch rise breaks into two runs with an intermediate landing for 51 feet. The fit endpoint answers the real-world question: does a ramp for this rise fit the run you have? It returns the minimum run an ADA 1:12 ramp needs, whether your space is enough, and the slope you would actually get if you forced it in — flagging when that exceeds 8.33 % and you need a switchback or a lower rise. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, accessibility, home-modification and contractor app developers, ramp-estimator and code-check tools, and building software. Pure local computation — no key, no third-party service, instant. Confirm against current ADA and local code. Live, nothing stored. 2 compute endpoints.

api.oanor.com/adaramp-api

Deck Builder API

Deck-building maths as an API, computed locally and deterministically — the board, joist and fastener counts a homeowner or contractor needs to material out a rectangular deck. The boards endpoint turns the deck size into a real shopping list: rows = deck width ÷ (board width + gap), rounded up, so a 16 ft × 12 ft deck with a 5.5-inch board face (a 5/4×6) and a 1/8-inch gap needs 26 rows; boards run the length, each row takes one 16 ft board, and a 10 % waste allowance brings it to 29 boards plus the linear footage and the deck area. The joists endpoint frames it: joists are spaced along the length, so count = ⌊length ÷ spacing⌋ + 1 — thirteen joists at 16-inch on-center (seventeen at 12-inch for stronger or diagonal decking), each spanning the width, plus two rim joists and a ledger as total framing linear feet. The fasteners endpoint counts the screws: every decking row crosses every joist once and is fastened with two face screws there, so a 16×12 deck takes 26 × 13 × 2 = 676 screws, about 744 with waste — or one hidden clip per intersection. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, contractor, home-improvement, building-materials and renovation app developers, deck-estimator and takeoff tools, and lumber-yard calculators. Pure local computation — no key, no third-party service, instant. US units (feet/inches). Live, nothing stored. 3 compute endpoints. Rectangular decks; for indoor floor area use a flooring API.

api.oanor.com/deck-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Roofing Calculator API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Roofing Calculator API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Roofing Calculator API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Roofing Calculator API cost?

Roofing Calculator API has a free tier with 100 calls / month. Paid plans start at €11.75 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Roofing Calculator API GDPR-compliant?

All requests to Roofing Calculator API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Roofing 3

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/area

Roof area, squares & bundles

Playground

Parameters

Custom headers

Language: Client:

GET /v1/pitch

Convert roof pitch

Playground

Parameters

Custom headers

Language: Client:

GET /v1/rafter

Rafter length

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Spec

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/roofing-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/roofing-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/roofing-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/roofing-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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Roofing Calculator API

API health

Pricing

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Related APIs

Roof Pitch API

Snow Load API

ADA Ramp API

Deck Builder API

Frequently asked questions

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