Calculate the full rectangular room perimeter or a missing room dimension. Optional settings include a default 10% waste allowance, stock-piece length and your supplier price per foot for a material cost estimate.

Find the full perimeter of a rectangular room. Door openings and other untrimmed sections are not deducted.

Waste, stock pieces and cost

Default 10%; enter 0 for no allowance. Cuts and joins may need more.

Default 12 ft. Common lengths: 8, 10, 12 and 16 ft. Enter the actual length available.

Optional supplier price in US dollars per linear foot. Blank omits cost. Taxes, delivery and labor excluded.

Related Calculators

Baseboard Trim Formula

The following formula is used to calculate the total length of baseboard trim needed for a room.

BT = 2 × (L + W)

Variables:

  • BT is the total length of baseboard trim needed (feet)
  • L is the length of the room (feet)
  • W is the width of the room (feet)

To calculate the total length of baseboard trim needed, multiply the length of the room by 2 and add it to the product of the width of the room multiplied by 2. This formula assumes a rectangular room and does not deduct doors or other untrimmed sections. For reverse solving, use the full perimeter before waste. Stock pieces are rounded up by total length, not optimized for individual cuts. Cost uses the length of whole pieces purchased and your entered US-dollar price per foot; taxes, labor and delivery are excluded.

What is a Baseboard Trim?

A baseboard trim, also known as a baseboard molding, is a decorative architectural feature commonly used in interior design. It is a strip of material, usually wood or vinyl, that runs along the bottom of a wall at the point where it meets the floor. It serves both a functional purpose, protecting the wall from damage, and an aesthetic purpose, providing a finished look and hiding any gaps or unevenness where the wall and floor meet.

How to Calculate Baseboard Trim?

The following steps outline how to calculate the Baseboard Trim.

  1. First, determine the length of the room (L) in feet.
  2. Next, determine the width of the room (W) in feet.
  3. Next, use the formula BT = 2*(L + W) to calculate the total length of baseboard trim needed (BT).
  4. Finally, calculate the Baseboard Trim.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Length of the room (L) = 10 feet

Width of the room (W) = 8 feet; perimeter = 2 × (10 + 8) = 36 feet. At 10% waste, plan for 39.6 feet: at least four 12-foot pieces by total length.