Baseboard Calculator

1. Enter the room length and room width in feet.
2. Enter the number of doors and the door width (usually 3 feet for a standard interior door).
3. Pick a waste factor: 10 percent for a simple rectangular room, 15 percent for rooms with bump-outs, 20 percent for complex layouts.
4. Pick the stock board length you plan to buy (8 ft is standard at retail stores).
5. Optionally enter a price per linear foot to see a cost estimate.
6. Read the total linear feet, board count and cost.

Here is what each result line means:

For door jamb and casing dimensions, see the door jamb width calculator.

A baseboard calculator estimates the linear feet and number of boards of baseboard trim you need for a room. It works from the room perimeter, subtracts doorways, adds a waste allowance for cuts and corners, and divides by the stock board length.

Contractors, remodelers and homeowners use it to order the right amount of trim before starting a baseboard installation, avoiding both surplus waste and mid-project trips to the store.

The calculator treats the room as a rectangle and subtracts each door opening from the total perimeter. The waste percentage accounts for miter cuts at corners, splice joints on long walls and material lost to mistakes.

1. Compute the room perimeter from the length and width.
2. Subtract the width of each door opening.
3. Multiply by (1 + waste / 100) to add the waste allowance.
4. Divide by the stock board length and round up to get the number of boards.

A room is 12 feet long and 10 feet wide with 2 doors that are each 3 feet wide. You want 10 percent waste and plan to buy 8-foot boards at $1.50 per linear foot.

Step 1. Perimeter = 2 x (12 + 10) = 44 feet.

Step 2. Door deduction = 2 x 3 = 6 feet. Net = 44 – 6 = 38 feet.

Step 3. Waste = 38 x 0.10 = 3.8 feet. Total = 38 + 3.8 = 41.8 feet.

Step 4. Boards = ceil(41.8 / 8) = 6 boards.

Cost. 41.8 x $1.50 = $62.70.

You need 6 eight-foot baseboard pieces at an estimated cost of $62.70.

Room Shape

The calculator assumes a simple rectangle. L-shaped rooms, bump-outs and alcoves add corners and short wall segments that increase waste. Measure each wall segment separately for complex floor plans and add the lengths instead of using length-times-width.

Number of Corners

Each inside corner needs a coped or mitered joint, and each outside corner needs a miter. Coped joints are cut from the face of the board and produce more waste than butt joints. More corners means more waste.

Stock Board Length

Longer boards (12 or 16 feet) reduce the number of splices on long walls but cost more per piece. Eight-foot boards are the most common at retail and fit in a standard pickup truck bed.

Door and Window Openings

Subtract doorways because baseboard does not run through them. Most calculators do not subtract windows, because baseboard typically continues below the window along the wall.

Baseboard Height

Height does not change the linear footage, but taller profiles (5-1/4 inches and up) cost more per linear foot than standard 3-1/4-inch baseboard.

Typical baseboard prices per linear foot in the United States as of 2024. Prices vary by region, retailer and finish.

Installation labor adds $1.00 to $3.00 per linear foot for a professional finish carpenter.

New Construction Finish

After drywall and paint, calculate baseboard for every room before ordering a single delivery of trim.

Remodeling One Room

Pull the old baseboard, measure the room, and order the right amount of replacement trim.

Comparing Materials

Run the calculator at different price points to compare MDF, pine and oak costs for the same room.

Rental Property Turnover

Calculate baseboard for multiple rooms quickly when refreshing a rental unit between tenants.

1. Forgetting to Subtract Doors

Baseboard does not run across doorways. Failing to deduct door openings adds 3 to 6 feet of wasted material per door.

2. Using Too Little Waste

A 5 percent waste factor is not enough once you account for inside and outside corner cuts. Use 10 percent minimum for a simple room and 15 percent if the room has alcoves or bump-outs.

3. Measuring to the Outside of the Wall

Baseboard runs along the inside face of the wall. Measure from inside corner to inside corner, not from outside wall to outside wall.

4. Ignoring Splice Joints on Long Walls

A wall longer than your stock board needs a splice. Plan the splice at a stud location and add a few inches for overlap.

5. Not Buying an Extra Board

It is common to damage a piece while coping or nailing. Buy one extra board as insurance, especially if a return trip to the store is inconvenient.

The calculator computes linear footage from a rectangular room perimeter with a flat waste percentage. It does not model individual wall segments, corner joints or irregular shapes.

The perimeter is 44 feet. Subtract about 6 feet for two 3-foot doors to get 38 feet. Add 10 percent waste for 41.8 linear feet, which is 6 eight-foot boards.

Measure each wall segment individually and add the lengths. Do not use the simple length-times-width formula because it assumes a rectangle. Add 15 percent waste for the extra corners.

Usually no. Baseboard runs along the wall below windows. Only subtract a window opening if the window extends all the way to the floor (like a sliding door).

Use 10 percent for a simple rectangular room with standard inside corners. Use 15 percent if the room has bump-outs or alcoves. Use 20 percent for complex layouts with many corners.

The most common residential baseboard height is 3-1/4 inches. Taller profiles of 5-1/4 and 7-1/4 inches are popular in rooms with higher ceilings.

Baseboard is sold in 8-foot lengths at most retail stores. Lumber yards may carry 12-foot and 16-foot lengths for longer walls.

Shoe molding (quarter-round) covers the gap between the baseboard and the floor. It is optional but common with hardwood and laminate flooring that expands and contracts.

Professional carpenters cope inside corners rather than miter them. One piece is cut square and butted into the corner, and the mating piece is coped to fit the profile. Coped joints stay tight as wood moves.

MDF (medium-density fiberboard) primed baseboard is the least expensive option, typically $0.50 to $1.00 per linear foot. It paints well but cannot be stained.

No. The calculation runs entirely in your browser and nothing you enter is stored or sent anywhere.

• InchCalculator, Trim and Molding Calculator (baseboard, crown molding and casing estimation method, stock length and waste guidance).
• MiniWebTool, Baseboard Trim Calculator (perimeter-based baseboard calculation with door deduction and waste).
• BricknBolt, How to Calculate Baseboards for a Room (step-by-step baseboard estimation for rectangular rooms, 10-20% waste recommendation).