Written by Guest Blogger Shawn Swanson

The fact is, measuring and estimating a crown molding project is quite simple. With just a little instruction and smidgen of confidence, just about anyone can do it. Be aware that this is a technique for estimating your project, it’s not a perfect system. Always purchase more than you estimate, just in case. Remember this: it’s cheaper to buy an extra piece with this order, than to order a single piece alone.

**Keywords**

**Inside corner:** Imagine a box. The corners inside the box are inside corners.
**Outside Corner:** Keep imagining a box. The corners outside of the box are outside corners.
**Linear Foot:** A Linear foot is exactly the same as a regular foot. No conversion is required. 12 linear feet is exactly the same as 12 feet.
**Breadth:** This is the size of the moldings face, it’s the part you will actually see once the crown molding is installed.

**Estimating a room with inside corners only**

- Measure along the walls from corner to corner
- Add those measurements together to find the linear footage
- Multiply linear feet by 12
- Divide by the length in inches of chosen crown molding (example: 94.5”)
- Add 10% to account for any mistakes

Linear Feet ∙ 12 ÷ Length + 10% = Estimated amount of crown molding needed

**Estimating a room with both inside and outside corners**

**Step 1**

- Count all outside corners.
- Multiply the number of outside corners by the breadth of the crown molding
- Multiply that number by 2
- Divide by the length in inches of chosen crown molding (example: 94.5”)
- Write this number down and save it for step 3

Total outside corners ∙ Breadth ∙ 2 ÷ Length = Additional molding for outside corners

**Step 2**

- Measure along the walls from corner to corner
- Add those measurements together to find linear footage
- Multiply linear feet by 12
- Divide by the length in inches of chosen crown molding (example: 94.5”)

Linear Feet ∙ 12 ÷ Length = Estimated amount of crown molding excluding outside corners

**Step 3**

- Add totals from step 1 and step 2
- Add 10% to account for any mistakes

Step 1 total + Step 2 total + 10% = Estimated amount of crown molding needed

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