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Construction Calculators

Baseboard & Trim Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
m
m
m
m
Verified formula Private

Boards needed

8

Linear metres of trim
17.10

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Baseboard & Trim Calculator

The Baseboard & Trim Calculator works out your boards needed, along with 1 related figure in an instant. Enter room length, room width and total door/opening width and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the room length.
  2. Enter the room width.
  3. Enter the total door/opening width.
  4. Enter the length per board.
  5. Read off your boards needed, together with linear metres of trim — the calculator updates automatically, with no button to press.

Worked example

For example, with room length of 5 m, room width of 4 m, total door/opening width of 0.9 m and length per board of 2.4 m, the boards needed is 8.

Inputs used
Room length 5 m
Room width 4 m
Total door/opening width 0.9 m
Length per board 2.4 m
Results
Boards needed 8
Linear metres of trim 17.10

Results are estimates for educational use, not professional advice.

Frequently asked questions

Add the room's perimeter, subtract door openings, then divide by board length and round up.

Baseboard is not fitted across doorways, so removing those widths avoids over-ordering.

Yes. Add about 10% for mitred corners, cutting errors and matching wood grain or pattern.

For a rectangular room it is twice the length plus twice the width.

Enter the room length. Enter the room width. Enter the total door/opening width. Enter the length per board. Read off your boards needed, together with linear metres of trim — the calculator updates automatically, with no button to press.

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