Baseboard, Trim & Crown Molding Calculator — Lineal Feet & Pieces
Estimate how much baseboard, crown, chair rail, and door/window casing you need. Enter each room's dimensions, pick the profiles you're running, account for doors and windows, and get lineal footage plus the number of stock lengths to buy — with a downloadable takeoff PDF.
| Profile | Lineal ft | Stock | Pieces |
|---|---|---|---|
| Run the calculator to see your takeoff | |||
How to use the baseboard, trim & crown molding calculator
Four quick steps turn your room dimensions into lineal feet and the number of stock lengths to buy — for baseboard, crown, chair rail, and door and window casing, all on one list.
Pick your profiles
Toggle baseboard, crown, chair rail, and casing. Choose a stock length and material — longer stock means fewer splices.
Add your rooms
Enter each room’s length and width; perimeter is 2 × (length + width). Use a quantity for identical rooms.
Enter openings & waste
Add your doors and windows so casing is counted and doorways come off the baseboard, then set a waste factor.
Read results & save a PDF
Get lineal feet by profile, pieces to buy, and a room-by-room breakdown — then download a two-page takeoff.
How a molding takeoff is calculated
Wall trim follows the room perimeter; casing follows each opening. Here is the exact math behind every number the calculator reports, from lineal feet to stock pieces.
Worked example — a 15 ft × 12 ft room: baseboard + crown + casing, one door, one window
Perimeter: 2 × (15 + 12) = 54 ft
Baseboard: 54 − 3 (door) = 51 ft · Crown: 54 ft
Casing: door 2×6.75 + 3 = 16.5 + window 2×(3+4) = 14 = 30.5 ft
Pieces @ 16 ft, +10%: baseboard 4, crown 4, casing 3
About 11 pieces of 16 ft stock — roughly 149 lineal feet including waste.
Molding estimating charts
Handy lookups for room perimeters, casing per opening, converting lineal feet to stock pieces, and typical waste factors. Figures exclude waste unless a column says otherwise.
| Room | Dimensions | Perimeter | 16 ft pieces (+10%) |
|---|---|---|---|
| Small bedroom | 10 × 10 ft | 40 ft | 3 pieces |
| Bedroom | 12 × 11 ft | 46 ft | 4 pieces |
| Living room | 15 × 12 ft | 54 ft | 4 pieces |
| Large room | 18 × 14 ft | 64 ft | 5 pieces |
| Great room | 20 × 16 ft | 72 ft | 5 pieces |
Piece counts are for one continuous profile (e.g. baseboard) before deducting doorways. Crown uses the full perimeter shown.
| Opening | Formula | Lineal ft |
|---|---|---|
| Interior door (3 × 6.75 ft) | 2H + W | 16.5 ft |
| Standard window (3 × 4 ft) | 2(W + H) | 14 ft |
| Large window (5 × 4 ft) | 2(W + H) | 18 ft |
| Patio / French door (6 × 6.75 ft) | 2H + W | 19.5 ft |
Doors are cased on 3 sides (no sill); windows wrap all 4 sides. Short casing offcuts often reuse across openings.
| Net lineal ft | 8 ft stock | 12 ft stock | 16 ft stock |
|---|---|---|---|
| 50 ft | 7 pieces | 5 pieces | 4 pieces |
| 100 ft | 14 pieces | 10 pieces | 7 pieces |
| 150 ft | 21 pieces | 14 pieces | 11 pieces |
| 200 ft | 28 pieces | 19 pieces | 14 pieces |
| 300 ft | 42 pieces | 28 pieces | 21 pieces |
Each profile is rounded up to whole pieces separately. Longer stock means fewer pieces and fewer splices on long walls.
| Scenario | Waste factor | Why |
|---|---|---|
| Long straight runs | 8–10% | Few cuts, little offcut |
| Simple rooms, paint-grade | ~10% | Standard miters & returns |
| Many corners / small rooms | 12–15% | More cuts, short offcuts |
| Stain-grade (grain match) | 15%+ | Cull for color & grain |
Waste covers miters, coped corners, returns, and blown cuts. Round up for detailed or stain-grade work.
Everything the calculator works out
One set of rooms and openings gives you every number needed to order and price the trim — from lineal feet per profile to the exact pieces to buy.
Key figures every trim takeoff depends on
Built for any trim job
From refreshing one room’s baseboard to casing out a whole house, the same calculator scales to the job.
Adding baseboard or crown to a single room and wants the lineal feet and exact number of sticks to buy.
- Enter one room’s length × width
- Toggle just the profiles you’re running
- Add 10% waste and get piece counts
Pricing baseboard, crown, and casing across every room and needs one clean material list.
- Batch identical rooms with Qty
- Enter total doors & windows
- Hand the PDF takeoff to the yard
Building a trim allowance into a remodel bid with the right stock length and waste for the finish.
- Compare 12 ft vs 16 ft stock
- Bump waste for stain-grade
- Break footage out by profile
7 tips for an accurate trim order
Trim is all corners and offcuts, so a careful takeoff saves both short orders and a pile of scrap. These habits keep your count honest.
Baseboard, trim & crown molding calculator FAQ
The footage, casing, and material questions people ask most before ordering trim.
Add up the perimeter of every room, subtract the doorways, then round up to whole stock lengths and add waste.
Perimeter = 2 × (length + width). A 15 ft × 12 ft room is 54 ft; subtract one 3 ft door and you have 51 ft of baseboard.
Divide by your stock length with 10% waste: 51 × 1.10 ÷ 16 ≈ 4 pieces of 16 ft baseboard.
Crown runs the full room perimeter — it doesn’t stop at doorways the way baseboard does, so use 2 × (length + width) with no deductions.
A 15 ft × 12 ft room needs 54 ft of crown. Add 10–15% waste (crown is mitered and coped at every corner), then divide by stock length — at 16 ft that’s about 4 pieces.
Buy longer stock on long walls to cut down on splices.
Casing is measured per opening, not by room perimeter:
• Door (3 sides, no sill): 2 × height + width. A standard door ≈ 2×6.75 + 3 = 16.5 ft.
• Window (4 sides, full wrap): 2 × (width + height). A 3×4 ft window = 14 ft.
Add up every opening, then add waste and round up to stock lengths. Short casing offcuts often reuse from opening to opening.
Common stock lengths are 8, 12, 14, and 16 feet. Longer stock means fewer splices on long walls, which looks cleaner and is stronger.
16 ft is popular for baseboard and crown on long runs; shorter stock suits casing and small walls with less leftover.
Pieces = total lineal feet, plus waste, divided by stock length and rounded up — so longer stock means fewer pieces for the same footage.
A 10% waste factor is typical for paint-grade trim in simple rooms. Bump it to 15% or more for rooms with many corners, lots of short walls, or stain-grade work where you match grain and color.
Waste covers miter cuts, coped inside corners, returns, the odd blown cut, and offcuts too short to reuse. Rounding each profile up to whole pieces already builds in some cushion.
Yes for baseboard and chair rail — both stop at each doorway, so subtract the total door width from the room perimeter.
Crown is the exception: it runs across the top of the wall and passes over doorways, so use the full perimeter with no deduction.
Windows don’t affect baseboard, since it runs beneath them. The calculator applies these rules automatically once you enter your doors.
Work room by room. Enter each room’s length and width for its perimeter, use a quantity for identical rooms, and add each rectangle of an L-shaped room separately.
Pick the profiles you’re running, enter your total doors and windows, and the calculator totals lineal feet per profile and converts it to stock pieces.
The result is one combined list — baseboard, crown, chair rail, and casing — ready to take to the supplier as a PDF.
It depends on finish and location, and it doesn’t change the footage — only the product you order.
Primed MDF is smooth, cheap, and takes paint beautifully, but swells if it gets wet. Pine and finger-joint are inexpensive and paintable. Hardwood is the choice for stain-grade trim. PVC or composite resists moisture, so it suits bathrooms, laundries, and exterior trim.
Choose by whether you’re painting or staining and how much moisture the room sees.
Estimating Notice: Actual molding footage varies with miters, coped joints, returns, splices, and layout, and with how doorways and irregular walls are handled. This calculator provides perimeter- and opening-based lineal feet and piece counts from your input — it is a planning aid, not a cut list. Always confirm quantities against your own room measurements, and verify profile, material, and finish with your supplier before ordering. For planning purposes only.