🎨 Paint Calculator by Room Size
Calculate exactly how many gallons of paint you need for any room — walls, ceiling & trim included.
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| Room Size | Floor Area | Wall Area | Gallons (Std Latex) | Metric (L) |
|---|---|---|---|---|
| 8 x 10 ft | 80 sq ft | 288 sq ft | 1.65 gal | 6.2 L |
| 10 x 10 ft | 100 sq ft | 320 sq ft | 1.83 gal | 6.9 L |
| 10 x 12 ft | 120 sq ft | 352 sq ft | 2.01 gal | 7.6 L |
| 12 x 14 ft | 168 sq ft | 416 sq ft | 2.38 gal | 9.0 L |
| 14 x 16 ft | 224 sq ft | 480 sq ft | 2.74 gal | 10.4 L |
| 15 x 18 ft | 270 sq ft | 528 sq ft | 3.02 gal | 11.4 L |
| 16 x 20 ft | 320 sq ft | 576 sq ft | 3.29 gal | 12.5 L |
| 20 x 24 ft | 480 sq ft | 704 sq ft | 4.02 gal | 15.2 L |
| Feature | Standard Size | Deduct (sq ft) | Deduct (m²) |
|---|---|---|---|
| Standard Interior Door | 3 x 7 ft | 21 sq ft | 1.95 m² |
| Large Interior Door | 3.5 x 7 ft | 24.5 sq ft | 2.28 m² |
| Small Window | 3 x 4 ft | 12 sq ft | 1.11 m² |
| Standard Window | 3.5 x 5 ft | 17.5 sq ft | 1.63 m² |
| Large Window | 4 x 6 ft | 24 sq ft | 2.23 m² |
| Sliding Glass Door | 6 x 7 ft | 42 sq ft | 3.90 m² |
| Fireplace Opening | 4 x 4 ft | 16 sq ft | 1.49 m² |
| Can Size | Volume (gal) | Volume (L) | Coverage (sq ft) | Coverage (m²) |
|---|---|---|---|---|
| Sample / Tester | 0.03 gal | 0.12 L | ~10 sq ft | ~0.93 m² |
| Quart | 0.25 gal | 0.95 L | ~87 sq ft | ~8.1 m² |
| Half Gallon | 0.5 gal | 1.89 L | ~175 sq ft | ~16.3 m² |
| 1 Gallon | 1 gal | 3.79 L | ~350 sq ft | ~32.5 m² |
| 5 Gallon (Bucket) | 5 gal | 18.9 L | ~1,750 sq ft | ~162.6 m² |
| Project | Total Paint Area | Gallons (Std Latex) | Cans Needed |
|---|---|---|---|
| Small Bathroom (6x8) | 222 sq ft | 1.3 gal | 2 x 1-gal |
| Bedroom (10x12) | 352 sq ft | 2.0 gal | 2 x 1-gal |
| Master Bedroom (14x16) | 480 sq ft | 2.7 gal | 3 x 1-gal |
| Living Room (16x20) | 576 sq ft | 3.3 gal | 4 x 1-gal |
| Full Apartment (800 sq ft) | ~2,400 sq ft | 13.7 gal | 3 x 5-gal |
| Whole House (2,000 sq ft) | ~6,000 sq ft | 34.3 gal | 7 x 5-gal |
Whether you plan to exactly estimate, #how many paint you will need for your project? Yes here everything becomes a bit unclear and hard. Calculator for paint helps you escape that headache, it simply removes the risk of guessing about amounts, so that you do not stay with barrels of leftover paint or, even worse, without paint in the middle of the work.
Usage of the website is very easy. Enter the size of your room, and the calculator right away says, #how many paint you will need. The most many ask for length, width and height.
How much paint do I need?
Some go further and ask to consider also doors and widnows, what has sense, they do not get covered by paint, so the calculator lowers the total area of walls.
Almost every important maker of paint has his own version online. Sherwin-Williams offers one, that fits every kind of task, that you give it. Valspar, Dunn-Edwards and Behr each has his own tools available around.
Also, independent websites like MyPerfectColor.com lead you step after step, if you want something neutral.
But here the problem, different calculators do not always agree. Enter your data in two or three of them, and you maybe receive some different results. All they give only rough numbers, of course.
The process for inside and outside paint are alike. Some even care about wooden trim and board coverings, if you them require. You enter your details and let the tool care about the rest.
One gallon usually covers wear around 400 square feet on smooth, prepared surface. For inside paint, it can be near 350 square feet each gallon, depending on circumstances. Really, the need of coverage depends on that, what you do.
Change from black wall to light? Or paint something rough and textured? You probably will need several coats.
Important note, that some calculators consider the colour. Reds and yellows; colours, that hardly hide damage, can require around 50 percent more material for good coverage. Such warning helps you not stay without paint in the middle of the room.
Professional painters also have calculators made for them. Some allow to include labor costs and prices each gallon, before giving a quote to client for inside or outside task.
New method uses the LiDAR sensor of your phone to scan room in only ten seconds. It estimates based on real measures instead of rough guesses. Besides paint, it can estimate wallpapers, floors and trimin one go.
Remove the worry from calculations of paint do not require big work. Fast website dumps the doubt and help you buy with confidence.
