The amount of paint needed depends on factors like the number of doors, windows, and the number of coats you plan to apply. As a rough estimate, a gallon of paint typically covers about 350 square feet with one coat. Calculate the total square footage of the walls you intend to paint and divide by 350 to get the number of gallons needed per coat. Remember to account for multiple coats if necessary.

Paint is any pigmented liquid, plastic, emulsion, cement paint, texture paint, liquefiable, or solid mastic composition that, after application to a substrate in a thin layer, converts to a solid film.

It is most commonly used to protect, color, or provide texture to wall. Paint can be made or purchased in many colors—and in many different types, such as watercolor or synthetic. Paint is typically stored, sold, and applied as a liquid, but most types dry into a solid.

Plastic emulsion paint is a water based paint which gives soft effect to the interior and exterior wall, it is long lasting, washable and easy to sustain.

Cement paint parts of exterior surfaces and maintenance good look of building for many years. It offers matt finish on walls and protect house from worse weather condition.

Textured paint creates stunning effect on walls of your house it not only make inspiring taxes but also provides protection from sever weather changes like alkali and ultraviolet rays.

Before you start paint work makes sure that surface should be cleaned of dust, grease and other foreign matter, deciding on Superior quality and adequate quality of paint and mix content of paint properly to get consistency in paint work.

Various factors come into play while arriving their coverage, like types of paint, labour skills, area of wall, wet and dry condition, due to this complexity, homeowners tend to make errors of judgement in selecting types of paint and their coverage.

In this article we know about how much paint do I need for room, how much paint is needed for a 10 × 12 room and how much paint do I need for a 12 × 12 room.

**How much paint do I need for a room**

To estimate the amount of paint needed for a room, measure the walls’ total square footage and subtract the windows and doors. A gallon of paint typically covers about 350 square feet, but this can vary based on the paint type and surface.

Usually, a master bedroom sizes 10 × 12 feet and height is around 10 feet, total perimeter of 4 walls in a 10 × 12 feet room = 2(10+12) = 44 feet, area of 4 wall = perimeter × height, 44 × 10= 440 sq ft, add ceiling area = 10×12 = 120 sq ft, such that 440 + 120 = 560 sq ft, deduct door and window area, such as 7×4 =28 sq ft, 4 × 3 = 12 sq ft, so final area of 10×12 room= 560_28_12 = 520 sq ft, therefore 10× 12 room have 520 sq ft of available area need to be painting.

Using thumb rule, dry and wet condition, generally quantity of paint needs per sq ft = 0.003 gallons, so quantity of paint for a 520 sq ft of 10×12 room = 0.003× 520 = 1.56 gallons, so, for fresh painting, there are 1.56 gallons or 6 Litres of paint i need for a 10×12 room to cover ceiling and wall and for re-painting, 1 gallon or 3.785 litres of paint is required to cover ceiling and wall.

In general, for a 10×10 room, you need to buy 1.38 gallons of paint, while for a 10×12 room, you need to buy 1.56 gallons of paint. Likewise, for a 12×12 room, you need to buy 1.75 gallons of paint, while for a 12×14 room, you need to buy 1.9 gallons of paint. In addition, for a 12×15 room, you need to buy 2 gallons of paint, while for a 12×16 room, you need to buy 2.1 gallons of paint.

**How much paint for a 10×12 room**

To paint a 10×12 room (a 120 square foot room), you’d got to purchase 1.56 gallons (or 6 liters) of paint. This will be sufficient to cover the internal walls and ceiling. But in case you’re fair repainting your 10×12 room, you merely require almost 1 gallon (4 liters) of paint.

Total perimeter of 4 walls in a 10 × 12 feet room = 2(10+12) = 44 feet, area of 4 wall = perimeter × height, 44 × 10= 440 sq ft, add ceiling area = 10×12 = 120 sq ft, such that 440 + 120 = 560 sq ft, deduct door and window area, such as 7×4 =28 sq ft, 4 × 3 = 12 sq ft, so final area of 10×12 room need to be painting = 560_28_12 = 520 sq ft, therefore 10× 12 room have 520 sq ft of available area need to be painting.

Maths calculation, 1) paintable surface area of 10×12 room = (perimeter × height) + ceiling area – opening area = 520 sq ft, 2) quantity of paint needs per sq ft = 0.003 gallons, 3) So, quantity of paint for 10×12 room, 520 × 0.003 = 1.56 gallons.

**How much paint do I need for a 10×10 room**

To paint a 10×10 room (a 100 square foot room), you’d got to purchase 1.38 gallons (or 5.2 liters) of paint. This will be sufficient to cover the internal walls and ceiling. But in case you’re fair repainting your 10×10 room, you merely require almost 0.8 gallons (3 liters) of paint.

Total perimeter of 4 walls in a 10 × 10 feet room = 2(10+10) = 40 feet, area of 4 wall = perimeter × height, 40 × 10= 400 sq ft, add ceiling area = 10×10 = 100 sq ft, such that 400 + 100 = 500 sq ft, deduct door and window area, such as 7×4 =28 sq ft, 4 × 3 = 12 sq ft, so final area of 10×10 room need to be painting = 500_28_12 = 460 sq ft, therefore 10× 10 room have 460 sq ft of available area need to be painting.

Maths calculation, 1) paintable surface area of 10×10 room = 460 sq ft, 2) quantity of paint needs per sq ft = 0.003 gallons, 3) So, quantity of paint for 10×10 room, 460 × 0.003 = 1.38 gallons.

**How much paint do I need for a 12×12 room**

To paint a 12×12 room (a 144 square foot room), you’d got to purchase 1.75 gallons (or 7 liters) of paint. This will be sufficient to cover the internal walls and ceiling. But in case you’re fair repainting your 12×12 room, you merely require almost 1.05 gallons (4 liters) of paint.

Total perimeter of 4 walls in a 12 × 12 feet room = 2(12+12) = 48 feet, area of 4 wall = perimeter × height, 48 × 10= 480 sq ft, add ceiling area = 12×12 = 144 sq ft, such that 480 + 144 = 624 sq ft, deduct door and window area, such as 7×4 =28 sq ft, 4 × 3 = 12 sq ft, so final area of 12×12 room need to be painting = 624_28_12 = 584 sq ft, therefore 12× 12 room have 584 sq ft of available area need to be painting.

Maths calculation, 1) paintable surface area of 12×12 room = 584 sq ft, 2) quantity of paint needs per sq ft = 0.003 gallons, 3) So, quantity of paint for 12×12 room, 584 × 0.003 = 1.75 gallons.

**How much paint do I need for a 12×15 room**

To paint a 12×15 room (a 180 square foot room), you’d got to purchase 2 gallons (or 7.5 liters) of paint. This will be sufficient to cover the internal walls and ceiling. But in case you’re fair repainting your 12×15 room, you merely require almost 1.2 gallons (4.5 liters) of paint.

Total perimeter of 4 walls in a 12 × 15 feet room = 2(12+15) = 54 feet, area of 4 wall = perimeter × height, 54 × 10= 540 sq ft, add ceiling area = 12×15 = 180 sq ft, such that 540 + 180 = 720 sq ft, deduct door and window area, such as 7×4 =28 sq ft, 4 × 6 = 24 sq ft, so final area of 12×15 room need to be painting = 720_28_24 = 668 sq ft, therefore 12× 15 room have 668 sq ft of available area need to be painting.

Maths calculation, 1) paintable surface area of 12×15 room = 668 sq ft, 2) quantity of paint needs per sq ft = 0.003 gallons, 3) So, quantity of paint for 12×15 room, 668 × 0.003 = 2 gallons.

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**How much paint do I need for a 12×16 room**

To paint a 12×16 room (a 192 square foot room), you’d got to purchase 2.1 gallons (or 8 liters) of paint. This will be sufficient to cover the internal walls and ceiling. But in case you’re fair repainting your 12×16 room, you merely require almost 1.26 gallons (5 liters) of paint.

Total perimeter of 4 walls in a 12 × 16 feet room = 2(12+16) = 56 feet, area of 4 wall = perimeter × height, 56 × 10= 560 sq ft, add ceiling area = 12×16 = 192 sq ft, such that 560 + 192 = 752 sq ft, deduct door and window area, such as 7×4 =28 sq ft, 4 × 6 = 24 sq ft, so final area of 12×16 room need to be painting = 752_28_24 = 700 sq ft, therefore 12× 16 room have 700 sq ft of available area need to be painting.

Maths calculation, 1) paintable surface area of 12×16 room = 700 sq ft, 2) quantity of paint needs per sq ft = 0.003 gallons, 3) So, quantity of paint for 12×16 room, 700 × 0.003 = 2.1 gallons

**How much paint do I need for a 12×14 room**

To paint a 12×14 room (a 164 square foot room), you’d got to purchase 1.9 gallons (or 7.2 liters) of paint. This will be sufficient to cover the internal walls and ceiling. But in case you’re fair repainting your 12×14 room, you merely require almost 1.14 gallons (4.5 liters) of paint.

Total perimeter of 4 walls in a 12 × 14 feet room = 2(12+14) = 52 feet, area of 4 wall = perimeter × height, 52 × 10= 520 sq ft, add ceiling area = 12×14 = 168 sq ft, such that 520 + 168 = 688 sq ft, deduct door and window area, such as 7×4 =28 sq ft, 4 × 6 = 24 sq ft, so final area of 12×14 room need to be painting = 688_28_24 = 636 sq ft, therefore 12× 14 room have 636 sq ft of available area need to be painting.

Maths calculation, 1) paintable surface area of 10×12 room = 636 sq ft, 2) quantity of paint needs per sq ft = 0.003 gallons, 3) So, quantity of paint for 12×14 room, 636 × 0.003 = 1.9 gallons.

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**Conclusions:-**

As per general practices, you would need about 1.75 gallons of paint to cover a 12×12 room with 10- foot high walls, while for a 10×10 room, 1.4 gallons of paint will be necessary. Likewise, for a 10×12 room, 1.5 gallons of paint will be required to cover wall and ceiling.