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How to measure and estimate for painting (Ultimate Guide)

estimate for painting a home can be a tedious task that takes up a lot of time and resources. It’s important to make sure everything is done correctly by measuring and estimating for painting before you begin the job.

This ensures that no paint or supplies are wasted, mistakes aren’t made, and the project finishes on schedule. Take some time out of your day to measure and estimate for painting today!

How Does a Quantity Surveyor Help to Calculate Painting?

Quantity surveying is a highly specialized branch of quantity and cost management. It has been defined as “the professional application of the science and technology of project costs to the supervision and estimation of the quantities for building works”.  

In practice, quantity surveyors manage site labor, plant, and equipment; estimate, schedule, and monitor materials and subcontractors; prepare cash-flow predictions; provide quantity budgets, progress reports, and forecasts for tendering purposes.

While quantity surveyors are not always involved in the design of projects, they may be required to advise on contractual or other business issues involving costs. 

As such, quantity surveyors need to understand the procurement process, the tendering process, and how costs are passed through to the client. Their primary role, however, is quantity estimation, which involves estimating material quantities and subcontractor labor units for both buildings works and civil engineering projects.


There are times when you need to ask for a painting estimate from a professional painting contractor. In some cases, a painting contract is required to get the painting done.

While there may be many painting companies, it can be quite difficult to find out which painting company is going to deliver the best painting services at the most reasonable price.

It becomes even more difficult when you have just bought a new house and want to get it painted before moving in date or if you want to renovate your office space and want a fresh look by repainting everything.

In such cases, try to ask for a painting quote from as many painting contractors as possible until you feel comfortable with what they offer as their painting rate per hour or day.

How to measure a house for painting

  1. Get the measurements of the length and width of the house
  2. Measure how high you want to paint on each wall, including between windows or doors
  3. Divide the height by 2 to determine how far apart you should measure from one end to another 
  4. From these measurements, create a grid with a pencil on graph paper and mark off where all your lines will be painted 
  5. Use a tape measure to make sure that everything is accurate before painting anything!

How to measure a wall for painting

  1. Use a measuring tape to measure the height and width of the wall
  2. Divide one measurement by another (for example, if you have a 12″ wide wall, divide that number by 2) 
  3. This will give you how many square feet your wall is
  4. Add 10% to the total area of your room for any trim or other features around it 
  5. Multiply this new number by $10-12 per square foot for an average cost estimate on paint and supplies 
  6. Choose a color from Benjamin Moore’s online store based on what you want your finished product to look like and enter in measurements when prompted

How to measure a ceiling for painting

  1. Use a measuring tape to measure the height and width of the ceiling
  2. Measure from one corner to another – this is your square footage
  3. Multiply that number by 2, then divide it in half for total square feet 
  4. Make sure you have enough paint for what you’re painting
  5. Add 1 inch to each side of your rollers if you’re painting a textured ceiling or wall 
  6. If there are any fixtures on the walls or ceilings, make sure they will be covered before starting work

How to measure a room for painting

  1. Measure the height and width of the room
  2. Determine what type of paint will be used – flat or glossy
  3. Calculate how many gallons are needed for coverage, depending on the size of the space to be painted
  4. Add a gallon for primer if it is not already included in the paint formula 
  5. Divide this number by two to determine how much paint is needed per coat 
  6. Multiply that number by three since you’ll need three coats total (two thin ones and one thick)

How to measure a bedroom for painting

  1. Measure the length and width of the room
  2. Determine how much paint you need for your desired color
  3. Calculate how many square feet are needed to accommodate your desired coverage area
  4. Purchase a roll of painter’s tape and a roller cover – these will allow you to create straight lines on your walls without having to use a ruler or other measuring tool
  5. Apply painter’s tape along the edges of the wall, which should be done in both directions from each corner so that there is no overlap 
  6. Paint over all areas where the painter’s tape was applied with an even coat of paint – this will ensure that you have enough coverage for your desired look

How to measure a kitchen for painting

  1. Measure the length and width of the room
  2. Multiply this number by two to get the square footage
  3. Divide this number by 2700 to find out how many gallons of paint you will need
  4. Use a level or laser measurer to determine if your walls are even, then mark them with a pencil 
  5. Takedown any pictures, curtains, or other items from the wall before painting begins 
  6. Paint an entire wall at a time – don’t go back and forth between different colors or designs on one wall

How to measure a pool for painting

  1. Use a measuring tape to measure the height and width of the pool 
  2. Calculate how many gallons of paint you’ll need by multiplying the length, width, and depth of your pool in feet with 3
  3. Add 2% more than what you calculated for your total amount of paint to account for any spills or errors during the painting 
  4. Divide this number by 100 to find out how many quarts are needed (example – if you need 8 quarts, divide 8 by 100 which equals 0.8)
  5. Multiply this number by 4 to get the number of liters needed (example – if you need 0.8 liters, multiply 0.8 x 4 = 3)
  6. Buy enough paint so that there is at least an inch leftover after filling up your pool


Estimating is an important step when painting a large space. It will help you plan the job and make sure that your crew has enough paint for the project, but there are other factors to consider too. 


For example, how many painters do you need? How much time can they work in one day? What kind of surface prep needs to be done before painting begins? 

We hope these questions have helped clarify some things about estimating, so if you want more information or advice on any aspect of this process please don’t hesitate to reach out!

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