Paint Calculator

How much paint do I need? Stop guessing. Paint Calculator works out exactly how much paint to buy for any room or wall — in seconds, fully offline, with no sign-up. Enter your room's length, width and wall height, choose your number of coats, and Paint Calculator tells you how many litres or gallons of paint you need and how many cans (tins) to buy. Subtract your doors and windows for an accurate estimate, and add the ceiling if you're painting that too. • Works in metric (m², litres) or imperial (sq ft, US gallons) • Set your own paint coverage rate and container/can size • Allows for multiple coats • Subtracts doors and windows • Optional ceiling area • 100% offline — no internet, no account, no data collected Perfect for DIY decorating, painters and decorators, landlords and home renovators planning a job and a shopping list. Avoid buying too little (an extra trip to the store mid-job) or too much (wasted money and half-used tins). Paint coverage, paint quantity, wall area, room painting estimate — all in one simple, fast, ad-supported free tool from Fernhart Labs.