Drywall texture calculator
400 square feet sprayed in one coat with 10% overspray take 1.76 gallons of mixed texture, so you buy 2 gallons of ready-mix or 1 bag of dry powder. Adjust coverage for orange peel, knockdown or popcorn. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Area
- 400
- Coats
- 1
- Waste percent
- 10
- Coverage
- 250
- Effective area
- 440
This drywall texture calculator turns the surface area you plan to spray into gallons of mixed texture compound and whole bags of dry mix for the same job. Homeowners, drywall finishers, and renovation estimators often buy the wrong amount of orange-peel, knockdown, or popcorn material because coverage is printed per gallon of mixed mud while bags are sold by weight with an approximate mix yield. The engine accepts area in square feet, optional coverage in square feet per gallon, coats, a waste percent for overspray, and gallons of mix per dry bag. Effective area multiplies raw area by coats and the waste factor; gallons divide that by coverage; bags ceiling the gallon need by bag yield. Defaults of two hundred fifty square feet per gallon, one coat, ten percent waste, and five gallons per bag match common medium orange-peel spray practice. The response is fully deterministic with no network calls, no sampling, and no date-dependent shortcuts.
What the calculator returns and how texture volume is defined
Texture compound volume here is the mixed sprayable material needed to coat a measured wall or ceiling area to a uniform spray pattern, expressed both in gallons and in whole dry-mix bags. Gallons are the unit ready-mix pails and hopper-gun guides use; bags are the unit big-box and specialty drywall aisles sell when you mix powder on site.
The conversion is straightforward once coverage and bag yield are fixed: effective area equals raw square footage times the number of coats times one plus waste percent over one hundred, gallons equal that effective area divided by coverage in square feet per gallon, whole gallons for purchasing ceiling the raw gallon figure, and bags ceiling gallons divided by gallons of mix per bag.
The calculator multiplies area by coats and the waste factor, divides by coverage for gallons, ceilings for ready-mix pail counts, and ceilings again by bag yield for dry powder. Treat the result as a planning estimate and adjust coverage for light orange peel, heavy knockdown, or popcorn according to the product data sheet before you commit to a bulk order.
Where texture estimates fit for DIY, trades, and software
DIY renovators meet this problem when a ceiling needs orange-peel after a patch, when a new basement suite gets knockdown on all walls, or when a popcorn scrape-and-respray must be stocked before the hopper is loaded. Trade estimators use the same identity across rooms and floors: measure plan or net wall and ceiling area, pick coverage from the texture product sheet or a house style standard, add coats and overspray waste, convert to gallons for ready-mix, and optionally convert to bags when powder is cheaper on large jobs.
Teachers and vocational trainers can pre-generate answer keys for modest room sizes without trusting opaque mobile apps that switch units mid-form or forget that coverage is per gallon of mixed compound rather than per bag weight. Developers call the same contract from scripts to seed deterministic test vectors for drywall estimators, to normalise user-entered spray areas before a cart suggests bag counts, or to satisfy programming-challenge statements that demand whole bags rather than a hand-waved “about two pails.”
Product tools use the rewrite when a homeowner types four hundred square feet and medium coverage and the UI must show gallon and bag totals before checkout. Pair it with the drywall sheet calculator when you still need board counts for new walls, and with paint quantity tools when primer or topcoat follows the texture coat in the same finish sequence.
What you can do with it
Weekend ceiling orange-peel refresh
Enter ceiling square footage and medium coverage to know gallons of mix and bags of dry texture before loading the hopper gun.
Contractor multi-room texture quotes
Feed measured wall and ceiling areas plus style-specific coverage and waste to produce reproducible gallon and bag totals for bids.
FAQ
What does the drywall texture calculator cost?
It is free in your browser on this page.
What units does the calculator use?
Area is in square feet (ft²). Coverage is square feet per gallon of mixed compound. Output volume is in gallons (gal) and whole bags. Keep length units consistent with the coverage label on your product.
What coverage should I use for orange peel or knockdown?
The default is 250 ft²/gal for medium orange peel. Light orange peel is often 300–400; knockdown 150–200; heavy popcorn about 100–150. Prefer the manufacturer data sheet when available.
How much texture compound do I need for 400 square feet?
About 1.76 gallons of mixed compound with the defaults: one coat, 10% overspray and 250 square feet per gallon. That rounds up to 2 gallons of ready-mix, or 1 bag of dry mix that yields 5 gallons.
How do extra coats change the amount of texture?
Each coat counts the whole area again before waste is added, so two coats need twice the compound of one. Fractions are accepted too, for a partial re-spray over a patched area.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/home/drywall-texture \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"area":400}'const res = await fetch("https://api.kit.forhosting.com/home/drywall-texture", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"area": 400
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/home/drywall-texture",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"area": 400
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/home/drywall-texture", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"area":400}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"area":400}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/home/drywall-texture", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"area": 400
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "home.drywall_texture",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Limits
max_abs | 1000000000 |
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
What the calculator returns and how texture volume is defined
The JSON response echoes area, coats, waste_percent, coverage, effective_area, gallons, gallons_ceil, gallons_per_bag, bags as a whole number, unit tags for square feet, gallons, and bags, a method tag, and a short formula string. There is no brand database, no nozzle-pressure model, no humidity correction, and no shopping cart: the page answers only the material-quantity questions with stable numbers suitable for worksheets, contractor quotes, and API consumers that must match goldens run after run.
How inputs are read, validated, and kept reproducible
Negative waste is also rejected. Preferred fields are area for sprayed surface in square feet and optional coverage for square feet per gallon of mixed compound, plus optional coats, waste_percent, and gallons_per_bag when you are not using the defaults of one coat, ten percent waste, two hundred fifty square feet per gallon, and five gallons of mix per bag. Aliases such as surface_area, sqft, square_feet, wall_area, ceiling_area, and spray_area for area; coverage_per_gallon, sqft_per_gallon, spread_rate, and rate for coverage; layers, n_coats, num_coats, and passes for coats; waste, overspray, overspray_percent, waste_pct, and margin for waste; and bag_yield, bag_gallons, gal_per_bag, and yield_per_bag for bag mix yield are accepted so spreadsheets, query strings, and typed forms can reuse the same contract without renaming columns. Every numeric field must be finite; non-positive area, coverage, coats, or gallons_per_bag is rejected with invalid_input so a zero-area form field cannot silently claim free mud. An optional precision field, with aliases decimals and dp, chooses how many decimal places to expose for areas and gallons, defaulting to four and capped at fifteen so JSON goldens stay stable across engines. Pair the free browser run on this page with the priced API when you need the identical mathematical result inside an automated pipeline without re-implementing the texture formula yourself.
Where texture estimates fit for DIY, trades, and software
On this page the work runs entirely in your browser; through the API each successful lookup costs $0.002, failed validation is not charged, and nothing is stored after the response returns. That split — free interactive exploration and a priced, identical API — matches the rest of the KIT tier-A catalog and lets you move from a garage demo to an automated quoting pipeline without changing the mathematical result.
Integration use cases
Deterministic fixtures for apps
Generate stable gallons and bags values for unit tests in renovation planners, e-commerce material suggesters, and CI checks.
Technical questions
How are gallons and bags calculated?
effective_area = area × coats × (1 + waste_percent/100); gallons = effective_area / coverage; bags = ceil(gallons / gallons_per_bag). gallons_ceil is the whole ready-mix gallons to buy.
What inputs are rejected?
Missing or non-finite area, zero or negative area, coverage, coats, or gallons_per_bag, and negative waste_percent all fail with invalid_input and are not billed.