Kitchen Cabinet Paint Calculator: How Much Paint

This calculator works out how much paint you need to buy for painting kitchen cabinets. You enter the total surface area of your cabinet doors, drawer fronts, and visible frames (in square feet or square meters), the number of coats you plan to apply, and the paint coverage rate from the can. It returns the total paint volume required in quarts and liters, so you can buy the right amount without over-purchasing or running out mid-project.

Formula

The core formula is straightforward:

Paint needed (gallons) = (Total surface area × Number of coats) ÷ Paint coverage per gallon

Variables:

• Total surface area – the sum of all cabinet door fronts, drawer fronts, and exposed frame faces you will paint, in square feet (or square meters).
• Number of coats – how many layers of paint you plan to apply. Typically 2 for most projects, sometimes 3 for a drastic color change or when covering a dark color with a light one.
• Paint coverage per gallon – the manufacturer’s stated spread rate, usually printed on the can. Most quality paints cover 300–400 sq ft per gallon (28–37 m² per liter).

The result is the minimum volume of paint you need. It does not include waste from spills, brush loading, or touch-ups, so most professionals add 10–20% extra.

Worked Example

Using the default values from the calculator:

• Surface area = 120 sq ft
• Coats = 2
• Coverage = 350 sq ft per gallon

Step 1: Multiply area by coats: 120 × 2 = 240 sq ft of total painted surface.

Step 2: Divide by coverage: 240 ÷ 350 = 0.6857 gallons.

Step 3: Convert to quarts: 0.6857 × 4 = 2.74 quarts.

Step 4: Convert to liters: 0.6857 × 3.78541 = 2.60 liters.

The calculator rounds to two decimals: 0.69 gallons, 2.74 quarts, 2.60 liters. In practice, you would buy a full gallon, because paint is sold in whole or half-gallon containers, and you need a little extra for touch-ups.

How to Measure Your Cabinet Surface Area

Measuring accurately is the hardest part. Here is a reliable method:

1. Remove one cabinet door and one drawer front. Measure their height and width in inches.
2. Multiply height × width to get the area of that single door or drawer front.
3. Count how many doors and drawer fronts of the same size you have. Multiply accordingly.
4. Repeat for each different size. Add all the totals together.
5. For the cabinet frames (the visible face frames), measure the width of each stile and rail and multiply by their lengths. Add these to the door/drawer total.
6. If you plan to paint the inside of the cabinets, measure those surfaces separately and add them in.

Convert square inches to square feet by dividing by 144. For example, a 30″ × 20″ door is 600 sq in, which equals 4.17 sq ft.

Common Mistakes and How to Avoid Them

The biggest error is forgetting that both sides of a door need paint. If you paint the inside and outside of each door, you must double the door’s area. The calculator’s “surface area� input should already include both sides if you plan to paint both.

Another frequent mistake is using the wrong coverage number. Spray application covers less than brush and roller because of overspray – often 20–30% less. If you are spraying, reduce the coverage per gallon by that amount. Also, porous or previously unpainted wood absorbs more paint, so reduce coverage by 10–20% for bare wood.

A third issue is rounding down. Paint is sold in quarts (32 oz) and gallons (128 oz). If your calculation says 0.69 gallons, you cannot buy 0.69 gallons – you buy 1 gallon. For a small project needing 0.3 gallons, you would buy a quart and a half-quart, or just a full quart and accept a little extra.

How Many Coats Do You Really Need?

Most cabinet paint jobs require two coats of the finish paint, plus a primer coat. The primer is separate – it is not counted in the topcoat calculation. If you are using a paint-and-primer-in-one product, you still need two coats for durability on cabinets because they get heavy use.

Three coats may be necessary if:

• You are going from a very dark color to a very light one.
• The previous finish is glossy and you are not sanding thoroughly.
• You are using a low-quality paint with poor hiding.

For the calculator, enter the number of topcoats only. If you need a primer, buy primer separately – typically one coat covers 300–400 sq ft per gallon, similar to paint.

Types of Paint and Their Coverage

Coverage varies by paint type and finish:

• Latex/acrylic enamel – 350–400 sq ft per gallon. Most common for DIY cabinets. Dries fast, cleans with water.
• Oil-based enamel – 300–350 sq ft per gallon. More durable but slower drying and requires mineral spirits for cleanup.
• Polyurethane or alkyd – 300–400 sq ft per gallon. Very hard finish, good for high-traffic cabinets.
• Chalk paint – 200–300 sq ft per gallon. Needs a wax or topcoat, lower coverage.

Always check the can’s label – the coverage number is for smooth, primed, non-porous surfaces. Textured or rough surfaces reduce coverage by up to 20%.

Cost Considerations and Buying Tips

Paint prices vary widely, but a typical gallon of quality cabinet paint costs between $30 and $80. For an average kitchen (about 150 sq ft of cabinet surface), you will need 1–1.5 gallons for two coats. That means $30–$120 for paint alone, plus primer ($15–$40 per gallon) and supplies (brushes, rollers, sandpaper, drop cloths) which add another $20–$50.

To save money, buy the largest container that is close to your calculated amount, but do not buy more than one full gallon over your estimate – you can always return unopened cans. Many stores allow returns on tinted paint, but not all, so ask before buying.

One tip: if your calculation says 0.8 gallons, buy one gallon. If it says 1.2 gallons, buy one gallon and one quart. That gives you a little extra for touch-ups without a full second gallon.

Frequently Asked Questions

Do I need to paint the inside of the cabinets? Not usually. Most people only paint the exterior surfaces – doors, drawer fronts, and the visible frame. Painting the inside is optional and adds significant time and paint. If you do paint the inside, measure those surfaces separately and add them to the total area.

Should I use a primer? Yes, especially on bare wood, laminate, or glossy surfaces. Primer seals the surface and helps the topcoat adhere. One coat of primer is usually enough. The calculator does not include primer – you need to calculate that separately using the same area but only one coat.

Can I use this calculator for spray painting? Yes, but reduce the coverage per gallon by 20–30% because overspray wastes paint. For example, if the can says 350 sq ft per gallon, use 250–280 in the calculator when spraying.

What if my cabinets have glass doors? Subtract the glass area from the door surface, since you won’t paint the glass. Measure the glass and subtract it from the door’s total area before entering it into the calculator.

How do I know if I measured correctly? A typical small kitchen (10×10) has about 100–120 sq ft of cabinet surface. A large kitchen can have 200+ sq ft. If your measurement is wildly different from those numbers, re-measure. Also, remember to include the sides of the cabinets if they are visible.

Is it better to buy a little extra paint? Yes, it is always wise to buy 10–15% more than the calculated amount. You will need it for touch-ups after installation, and matching paint later is nearly impossible if you run out. The calculator gives the minimum – add a buffer.

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in area | Surface area to paint | sq ft | 120 | 0
in coats | Number of coats | - | 2 | 1
in coverage | Paint coverage per gallon | sq ft/gal | 350 | 50
out paint_gallons | Paint needed | gallons | (area * coats) / coverage | 2
out paint_quarts | Paint needed | quarts | ((area * coats) / coverage) * 4 | 2
out paint_liters | Paint needed | liters | ((area * coats) / coverage) * 3.78541 | 2