CrewMeasure

Trim Calculator

Estimate baseboard and casing.

This room needs — ft of trim. Order from the material list below — each profile rounds up separately, so those lines total a little more.

Perimeter source

Use the active Room Layout's perimeter or override manually.

Perimeter source

Already ran Room Layout for this room? Keep this on Active project to skip re-entering the perimeter by hand.

Chained perimeter

Run Room Layout first to prefill trim with the active project's perimeter.

Trim context

Interior and exterior trim use different profiles and materials; the waste default updates but stays editable.

Context

Trimming inside the house? Use Interior. Trimming outside doors/windows or siding edges? Use Exterior.

Room dimensions

Perimeter drives baseboard length; door widths are subtracted from the baseboard run.

Doors and windows

Each opening is width x height in inches — a 3068 door is 36x80. Add more by separating with commas.

Door casing faces

A passage door is cased on both sides of the wall. A closet or pocket opening, or an exterior door, is usually cased on the inside face only. Mixed room? Run the closet doors separately.

This room needs — ft of trim. Order from the material list below — each profile rounds up separately, so those lines total a little more.

You'll need

Trim results

Baseboard to buy
— ft
Door casing to buy
— ft
Window casing to buy
— ft
Finish nails
— nails

Warnings

  • ERROR Enter the room perimeter -- without it there is no baseboard to count.

Detail values

Baseboard linear feet
— ft
Door casing linear feet
— ft
Window casing linear feet
— ft

Assumptions

  • Trim context: Interior (MDF, finger-joint, or wood baseboard & casing)
  • Door casing faces: Not stated -- door casing is not counted until this is answered (see gaps)
  • Window casing: Picture-frame casing, all four sides (2 x height + 2 x width per window). Stool-and-apron is NOT modelled: it has no bottom casing leg but adds a stool and an apron this figure does not count.
  • Estimated waste: 10% for an average project
  • Estimated finish nails: 1.5 per foot of trim counted -- a jobsite practice figure, not a published fastening schedule
  • Baseboard order:
  • Door casing order:
  • Window casing order:

Included: baseboard, door casing, window casing, finish nails, waste allowance.

Not included: labor, delivery, permits, disposal of waste material.

Material List

About this calculator

Enter perimeter or run lengths for baseboard and casing separately to get purchase-ready linear footage for each.

FAQ

Are baseboard and casing calculated separately?

Yes. Door and window casing remain a separate run from baseboard since they are usually bought and cut differently.

Does baseboard length subtract door openings?

Yes, automatically. Enter the gross perimeter -- the full distance around the room's walls -- and each door width from the Doors list below comes off the baseboard run for you. Window widths are not deducted, since baseboard runs under a window.

Why is waste applied to trim?

Trim waste covers miter cuts, splices, and damaged pieces, and is applied before rounding up to whole linear feet or pieces.

Can I enter more than one door or window?

Yes. Add more doors or windows to the comma-separated list, each as its own width x height pair.

Why does interior vs. exterior matter?

Interior and exterior trim use different profiles and materials (MDF or finger-joint indoors; PVC, composite, or weather-rated wood outdoors), so exterior work defaults to a higher waste allowance for weather-cut handling. Both defaults stay editable.

Disclaimer

Material estimate only. Verify door and window casing widths before ordering.