Interior Paint Calculator
Our interior painting cost calculator goes beyond paint volume — it estimates the total cost of your interior painting project, including materials and labour. Choose between budget, standard, or premium paint quality, enter your room dimensions, and set the labour rate per square foot to get an instant cost breakdown.
Room Dimensions
Paint Quality & Costs
Good coverage in 2 coats
Paint needed
1.92 gallons
2 coats
Material cost
$86.4
Labour cost
$960
Cost per area
$2.73/sq ft
Total Estimated Cost
$1,046.4
Materials + Labour · Standard paint
Cost estimates are based on typical paint and labour rates. Actual costs vary significantly by region, painter experience, and project complexity. Always get multiple quotes.
Our interior painting cost calculator goes beyond paint volume — it estimates the total cost of your interior painting project, including materials and labour. Choose between budget, standard, or premium paint quality, enter your room dimensions, and set the labour rate per square foot to get an instant cost breakdown.
How to Use This Calculator
- 1.Enter your room dimensions (length, width, and height).
- 2.Select paint quality: Budget (£15-25/gal), Standard (£30-50/gal), or Premium (£60-100/gal).
- 3.Enter the labour cost per square foot for your area.
- 4.Set the number of coats (2 recommended).
- 5.Review the results: paint volume, material cost, labour cost, and total estimated cost.
How the Interior Painting Cost Calculator Works
The calculator first computes wall area: 2 × (Length + Width) × Height. Paint Volume = (Wall Area × Coats) ÷ Coverage Rate (400 sq ft/gal or 10 sq m/litre). Material Cost = Paint Volume × Paint Price Per Unit. Labour Cost = Wall Area × Labour Rate Per Sq Ft. Total Cost = Material Cost + Labour Cost. Cost Per Sq Ft = Total Cost ÷ Wall Area. These figures are estimates — actual costs vary by region, painter experience, and project complexity.
Frequently Asked Questions
How much does it cost to paint a room interior?
A typical 12×12 room with 8-foot ceilings has about 384 sq ft of wall area. With standard paint at £40/gallon and labour at £2.50/sq ft, expect roughly £1,050-1,200 total, including 2 coats and minor prep work. Costs vary significantly by region and painter.
What is the difference between budget and premium paint?
Budget paints (£15-25/gal) may require 3+ coats and lack durability. Standard paints (£30-50/gal) provide good coverage in 2 coats and last 5-7 years. Premium paints (£60-100/gal) offer superior coverage, washability, and 10+ year lifespan, often saving money long-term.
How is labour cost calculated for interior painting?
Painters typically charge per square foot of wall area, ranging from £1.50 to £4.00/sq ft depending on region, prep work required, and ceiling height. Some charge a day rate (£200-400/day) instead. This calculator uses a per-sq-ft rate for simplicity.
Should I paint interior walls myself or hire a professional?
DIY painting saves labour costs but requires time, tools, and skill. For a single room, DIY can save £200-600. For multiple rooms or high ceilings, a professional ensures a quality finish and saves significant time. Use this calculator to compare costs.
Last updated: 2026-10-06
Disclaimer: This calculator provides an estimate based on standard paint coverage rates. Actual coverage varies by surface texture, paint brand, application method, and environmental conditions. Always buy 10-15% extra paint for touch-ups and re-verify coverage rates on your paint can label.