# Paint Calculator

> Estimate paint quantity from wall area, openings, coats, coverage, and waste allowance. Add editable USD material and labor prices and compare low, middle and high budget scenarios.

Page: https://askcalculators.com/us/paint/
Definition: https://askcalculators.com/us/paint/definition.json
JSON Schema: https://askcalculators.com/us/paint/schema.json
Version: 20.13.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/us/paint/?roomLength=15&roomWidth=12&wallHeight=8&openingsArea=40&coats=2&coverage=350&wastePercent=10&unitCost=45&laborCost=300&deliveryCost=0&costSpreadPercent=15

## Inputs
- unitSystem: Dimension units; type=select; optional; default=imperial; values=imperial|metric
- roomLength: Room length (ft / m); type=number; required; default=15; min=0
- roomWidth: Room width (ft / m); type=number; required; default=12; min=0
- wallHeight: Wall height (ft / m); type=number; required; default=8; min=0
- openingsArea: Openings (ft² / m²); type=number; required; default=40; min=0
- coats: Number of coats; type=number; required; default=2; min=1
- coverage: Coverage per gallon (ft²); type=number; required; default=350; min=0.000001
- wastePercent: Waste allowance; type=number; required; default=10; min=0; max=100
- unitCost: Material price (USD / US gallon); type=money; optional; default=0; min=0
- laborCost: Total labor allowance (USD); type=money; optional; default=0; min=0
- deliveryCost: Delivery allowance (USD); type=money; optional; default=0; min=0
- costSpreadPercent: Low/high variation around entered subtotal (%); type=percent; optional; default=15; min=0; max=100

## Outputs
- gallons: Paint required (gallons); format=number; primary
- gallonsToBuy: Whole gallons to buy; format=integer
- paintArea: Coated area (ft²); format=number
- netWallArea: Net wall area (ft²); format=number
- litres: Exact paint need (litres); format=number
- materialCost: Material cost; format=currency
- laborCost: Labor allowance; format=currency
- deliveryCost: Delivery allowance; format=currency
- unitRate: Entered USD rate / US gallon; format=currency
- estimatedTotal: Entered subtotal; format=currency
- costLow: Low budget scenario; format=currency
- costMid: Middle budget scenario; format=currency
- costHigh: High budget scenario; format=currency
- pricingStatus: Pricing status; format=text

## Formula
paint = [perimeter × height − openings] × coats × (1 + waste%) ÷ coverage; material = unrounded purchase quantity × entered unit price; middle = material + labor + delivery; low/high = middle × (1 ∓ variation/100)

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Planning quantities and user-entered USD costs, not a contractor quote, structural design or code approval. Default prices are zero (unpriced); enter your supplier and labor quotes. New changes await independent review.