Paint needed for an area
API · /paint-api
Paint Calculator API
healthy
3,354 Subscribers
Paint estimating and mixing maths as an API, computed locally and deterministically. The coverage endpoint works out how much paint an area needs — paint = area × coats ÷ spreading rate — from an area (in square metres or square feet), the number of coats and the paint's coverage (in m² per litre or square feet per US gallon, defaulting to a typical emulsion), and returns the volume in litres and US gallons and, given a tin size, the number of tins to buy. The room endpoint computes the paintable wall area of a room from its length, width and height — perimeter × height minus the door and window openings, optionally plus the ceiling — and then the paint needed, with sensible default door and window sizes you can override. The ratio endpoint splits a total volume by a mixing ratio such as 4:1 (base to hardener) or 4:1:10 (base, hardener, thinner) into each component's amount and percentage, or scales the whole mix up from one known component amount — for two-part epoxies, catalysed paints and thinning. Everything is computed locally and deterministically, so it is instant and private. Ideal for decorating, trade and DIY tools, hardware-store and paint-shop apps, estimating and quoting software, and home-improvement projects. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is paint coverage and mixing; for mulch, soil and gravel volumes use a landscaping API.
api.oanor.com/paint-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 78 ms
- Server probes · 24h
- Subscribers
- 3,354
- active
- Total calls
- 80
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 3,000 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- Single-room paint coverage estimates
- Metric and imperial units
- Standard 1-coat calculation
- Community support
Starter
€4.00 /month
- 40,000 calls / month
- 5 requests / second
- Hard cap (429 above quota, no overage)
- Multi-coat and primer estimates
- Door and window deductions
- Tin-size rounding helper
- Email support
Pro
€11.00 /month
- 250,000 calls / month
- 15 requests / second
- Hard cap (429 above quota, no overage)
- Batch room/project coverage
- Paint mixing ratio maths
- Cost-per-area estimating
- Priority support
Mega
€39.00 /month
- 1,530,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- High-volume estimating for quoting apps
- Full mixing and tinting calculations
- Bulk project line-item breakdowns
- SLA-backed support
Built by
Related APIs
Other APIs with overlapping tags.
Construction Calculator API
Construction and material estimating as an API — the everyday "how much do I need to buy" maths for building and renovation jobs, computed locally and deterministically from standard geometry and trade rules of thumb. The paint endpoint works out the litres and number of cans for a surface, allowing for the number of coats and the paint's coverage and deducting doors and windows. The tile endpoint computes how many tiles (and full boxes) a floor or wall area needs from the tile dimensions and a wastage allowance. The concrete endpoint gives the concrete volume in cubic metres, cubic yards and litres — and the number of pre-mix bags — for a slab, footing, wall or round column, with an optional batch quantity. The bricks endpoint computes how many bricks a wall needs from the brick size and mortar joint (default 215×65 mm brick with a 10 mm joint ≈ 60 bricks per square metre). Everything is computed locally and deterministically, so it is instant and private. Ideal for builders' merchants and trade apps, DIY and home-improvement tools, quoting and estimating software, and project planners. Pure local computation — no key, no third-party service, instant. Live, nothing stored. Estimates are guidance — allow for site conditions and follow the manufacturer's stated figures. 4 endpoints. This is materials estimating; for plain unit conversion use a unit-conversion API and for tyre or drivetrain maths use a tyre API.
api.oanor.com/buildcalc-api
Caulk Coverage API
Caulk and sealant coverage maths as an API, computed locally and deterministically — the linear-feet-per-tube and how-many-tubes numbers a builder, glazier or DIYer buys sealant by. A bead of caulk is essentially a thin cylinder, so the coverage endpoint works out the feet a cartridge lays from the bead width: volume per foot ≈ (π/4 × width²) × 12 inches, and a standard 10.1 fl oz cartridge (18.2 in³) lays about 30 feet of a quarter-inch bead, 13 feet of a fat three-eighths or 55 of a fine three-sixteenths — pass cartridge_oz for sausage packs or 28-oz tubes, and a tube count to total it. The tubes endpoint runs it backwards: cartridges needed = (joint length × a waste factor) ÷ feet per cartridge, rounded up, so a 100-foot run of quarter-inch bead with 10 % waste takes four tubes. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, glazing, weatherproofing and home-improvement app developers, material-estimator and shopping-list tools, and contractor software. Pure local computation — no key, no third-party service, instant. Inches and feet; estimates — tooling and waste vary. Live, nothing stored. 2 compute endpoints.
api.oanor.com/caulk-api
Wallpaper Calculator API
Wallpaper-estimating maths as an API, computed locally and deterministically. The rolls endpoint uses the proper drop method: it works out how many full-height drops come from each roll, floor(roll length ÷ (wall height + pattern repeat)), how many drops the room perimeter needs, ceil(perimeter ÷ roll width), and from those the rolls required — so a larger pattern repeat correctly increases the count. The simple endpoint gives a quick area-based estimate, rolls = ceil(wall area·(1+waste) ÷ roll coverage), handy for plain papers. The cost endpoint totals the project from the rolls and price per roll plus the adhesive, with one tub of paste hanging about five rolls. The standard roll of 10.05 m × 0.53 m is assumed unless you override it. Everything is computed locally and deterministically, so it is instant and private. Ideal for home-decor, renovation and trade app developers, DIY and room-planning tools, and decorator and retailer calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is wallpaper estimation; for wall paint use a paint API and for floor tiles use a flooring API.
api.oanor.com/wallpaper-api
Cable Tray Fill API
Cable-tray fill engineering maths as an API, computed locally and deterministically from NEC Article 392 — the allowable-fill, single-layer and tray-width numbers an electrician, estimator or designer runs for a tray run. The fill endpoint applies NEC 392.22(A)(1) Column 1 for multiconductor power and lighting cables no larger than 4/0 in a ladder or ventilated-bottom tray: the total cable cross-sectional area is capped at the tray width × 7/6, so a 12-inch tray allows 14 in² — sum every cable's csa, get the percentage fill and whether it is within code, with the spare area left. The large-cable endpoint covers cables 4/0 and larger, which must lie in a single layer with the sum of their diameters not exceeding the tray width — no stacking — so it returns the spare width and the code check. The min-width endpoint inverts the rule to size the tray: minimum width = cable area × 6/7, rounded up to a standard 6/9/12/18/24/30/36-inch width, leaving room for spare capacity and future cables. Everything is computed locally and deterministically, so it is instant and private. Ideal for electrical-design and estimating tools, industrial and OSP utilities, and code-check calculators. Pure local computation — no key, no third-party service, instant. Ladder/ventilated trays; solid-bottom and mixed fills use the other NEC columns, and ampacity must be derated for fill. 3 compute endpoints. For conduit and box fill use a conduit API.
api.oanor.com/cabletray-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Paint Calculator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Paint Calculator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Paint 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 Paint Calculator API cost?
Paint Calculator API has a free tier with 100 calls / month. Paid plans start at €4.00 / 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 Paint Calculator API GDPR-compliant?
All requests to Paint 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.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/paint-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/paint-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/paint-api/SOME_PATH");
curl_setopt($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/paint-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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