Home Construction & DIY Interior Baseboard & Trim Calculator
Construction & DIY · Interior
0 LF
Total linear footage needed (with waste)
Room Dimensions
Room Length (ft) Width (ft) Doors Include
Pricing & Extras
Each window adds ~12 LF
Results
Total Linear Footage Needed
0
linear feet
0
Baseboard LF
0
Door Casing LF
0
Window Casing LF
0
Pieces to Buy
0
Nail Boxes (1 lb)
$0
Total Cost
Pieces needed 0 pcs
Molding length per piece 12 ft
Price per LF $1.75
Estimated Cost $0.00
Nail estimate: 1 nail per 16" ≈ 0 nails → 0 box(es) of 1 lb (~300 nails)
Baseboard LF per Room
Room Summary Table
Room L × W (ft) Perimeter (LF) Doors Deduction (LF) Net LF
Common Trim Profiles
Profile Typical Height Style Typical Price ($/LF) Best Applications Notes
Colonial 3.5" – 5.5" Traditional $1.50 – $3.00 Living rooms, dining rooms, bedrooms S-curved profile with multiple layers; the most common residential style
Craftsman / Mission 3.5" – 5.5" Arts & Crafts $1.75 – $3.50 Bungalows, open-plan homes, modern farmhouse Flat face with routed top edge; pairs with square door casings
Ranch / Sanitary 2.5" – 3.5" Modern / Minimal $0.90 – $1.75 Contemporary homes, utility rooms, basements Simple single-step profile; easy to paint; lowest cost option
Clamshell 2.5" – 3.25" Classic $0.80 – $1.50 Apartments, rental properties, budget renovations Single curved profile; one of the most economical and widely available
Ogee / Classic 4.25" – 7" Victorian / Period $2.00 – $5.00 Victorian homes, formal rooms, high-end renovations Elaborate S-curve with multiple reveals; requires careful corner work
Shoe Molding 0.75" – 1" Supplemental $0.50 – $1.00 Covers floor-to-baseboard gap on all flooring types Quarter-round or shoe profile; nail to baseboard, not floor
Cove / Cap 0.75" – 2" Supplemental $0.60 – $1.50 Top of baseboard as cap molding; cabinet interiors Concave profile; softens the transition to the wall
Height Selection Guide
Ceiling HeightRecommended Baseboard
8 ft (standard)3.5" – 4.5"
9 ft4.5" – 5.5"
10 ft+5.5" – 7"
Rooms with crown moldingMatch baseboard height to crown height (±0.5")
Material Options
MaterialProsCons
Finger-joint pineEconomical, paintableMust be painted; shows joints
Clear pine / poplarSmooth surface, stainableHigher cost than FJ
MDFNo grain, crisp paint finishHeavy; vulnerable to moisture
PVC / foamMoisture-proof, zero rotHarder to nail; looks less authentic
Hardwood (oak, maple)Premium look, stainableExpensive; difficult to miter
Inside Corners: Cope, Don't Miter
For inside corners, use a coped joint rather than two 45° miters. Run the first piece square to the wall. On the second piece, cut a 45° inside miter, then follow the profile with a coping saw to create a negative of the first piece's face. Coped joints stay tight as the wood expands and contracts; butt miters open up over time.
Outside Corners: 45° Miters
Outside corners get two 45° miter cuts. Dry-fit both pieces first. If the corner isn't perfectly square, use a bevel gauge to find the actual angle and split the difference between the two cuts. Glue the joint, nail both pieces, and hold them together with blue tape while the glue sets. Sand flush once dry.
Nail Placement & Spacing
Use 2" (15 gauge) or 2.5" finish nails for 3/4" thick baseboard. Nail into wall studs (typically 16" on center) near the top and bottom of the baseboard. Pre-drill near ends to prevent splitting. Set nails slightly below the surface with a nail set, then fill holes with spackling or colored putty before painting.
Shoe Molding & Floor Gaps
If your floor has an uneven surface or there's a gap under the baseboard, add shoe molding (quarter-round or a flat shoe profile). Always nail shoe molding to the baseboard, never to the floor. This allows the floor to expand and contract beneath it without buckling. Shoe molding should follow the floor profile, not the wall.
Caulking & Filling Gaps
After nailing, run a bead of paintable latex caulk along the top edge where baseboard meets the wall, and along the bottom where it meets the floor (if no shoe molding). Smooth with a wet finger or caulk tool. Fill nail holes with spackling. Allow to fully dry before priming — caulk shrinks as it cures and may need a second thin pass.
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Painting Order
Prime all trim before installation if possible — it's much faster than painting in place. After installation and caulking, apply two topcoats with a semi-gloss or gloss finish for easy cleaning. Paint walls first, then do the final trim coat. Use a 2.5" angled sash brush and steady hand, or apply blue tape to protect walls. Remove tape immediately after painting while wet.
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Door & Window Casings
Casings typically use the same profile as the baseboard. Standard reveal: leave 3/16" of the door jamb edge exposed before the casing. For doorways, cut two side pieces (leg casings) and one top piece (head casing). Use a 45° miter at the corners or a plinth block at the base. Each doorway uses approximately 17 LF of casing material total (both sides).
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Order Enough — Buy in One Batch
Molding profiles can be discontinued or dye-lots can shift between production runs. Always order 10–15% more than calculated, and buy it all in one trip from the same stock. Store extra pieces in a dry, flat location. For large projects spanning multiple rooms, have all molding delivered at once so profiles and wood tones are consistent throughout.
Quick Reference: Common Measurements
ItemStandard ValueNotes
Door opening deduction3 LF per doorSingle door; 6 LF for double door
Door casing per doorway~17 LFBoth sides + header (~7ft sides × 2 + ~3ft header × 2)
Window casing per window~12 LFStandard 3 ft × 4 ft window, both sides + sill + head
Nail spacing16" on centerInto studs; 1 nail per 16" = 0.75 nails/LF
Nails per 1-lb box~300 nails15 gauge 2" finish nails
Caulk tube coverage~30–40 LF1 tube per ~35 LF of baseboard
Primer coverage~350 sq ft/quart1 qt typically covers 1 room; buy extra for two coats

How to Use This Calculator

  1. 1
    Enter your rooms: Add each room's name, length, and width in feet. Set the number of doors per room (each door opening deducts 3 LF from the perimeter). Check or uncheck rooms to include them.
  2. 2
    Choose baseboard height: Select the profile height that matches your molding. 3.5" is the most common residential choice. Taller ceilings suit wider baseboards.
  3. 3
    Set waste and molding length: Use 10% waste for simple rooms; 15% for complex layouts or angled walls. Select the molding stick length sold at your supplier (12 ft is standard).
  4. 4
    Add casings: Enable door casings to add ~17 LF per doorway. Enter your window count to add ~12 LF per window. Enter a price per linear foot to get your cost estimate.
  5. 5
    Review all tabs: The Room Breakdown tab shows a chart and table per room. The Trim Types tab compares profiles. Installation Tips tab covers corner technique, nailing, and painting order.

Key Formulas

Room Perimeter = 2 × (L + W)
Net LF per Room = Perimeter − (doors × 3)
Door Casing = total doors × 17 LF
Window Casing = windows × 12 LF
Grand Total LF = (baseboard + casings) × (1 + waste%)
Pieces to Buy = ⌈ Grand Total LF ÷ stick length ⌉
Total Cost = pieces × stick length × $/LF
Nail Count = total LF × 0.75 nails/LF

Glossary

Linear Foot (LF)
A unit of length used to price and measure molding. One linear foot = 12 inches of trim length. Baseboard is always quoted and sold by the linear foot.
Baseboard
Trim molding installed along the bottom of interior walls where they meet the floor. Covers the joint between wall drywall and flooring, and adds decorative detail.
Door Casing
Trim molding that frames a door opening on both the wall side and the jamb side. Typically the same profile as the baseboard for visual consistency.
Coped Joint
A joinery technique for inside corners where one piece is run square and the second is cut to follow the profile of the first. More durable than a mitered inside corner.
Shoe Molding
A small supplemental molding (quarter-round or flat shoe) installed at the floor-baseboard junction to cover gaps from uneven floors or flooring expansion.
Waste Factor
Extra material ordered to cover offcuts from inside/outside corners, mistakes, and miscuts. 10% is standard; use 15% for rooms with many angles or corners.
Reveal
The small setback (typically 3/16") between the edge of a door jamb and the face of the casing. The reveal is intentional — it creates a clean shadow line and is standard practice.
Finger-Joint Pine (FJP)
Budget-grade baseboard made from short pine offcuts glued together end-to-end. Suitable for painted applications only; the joints show through stain or clear finish.

Frequently Asked Questions

How do I calculate how much baseboard I need?

Measure the perimeter of each room (2 × length + 2 × width) and subtract 3 LF per door opening. Sum all rooms, add door and window casing footage if desired, then multiply by 1.10 (10% waste). Divide by your molding stick length and round up to get the number of pieces to buy. This calculator does all of that automatically.

Should I cope or miter inside corners?

Cope inside corners whenever possible. Two mitered pieces at 45° will open up a gap as the wood expands, contracts, or the house settles. A coped joint remains tight because it interlocks with the face of the first piece. Miters are fine for outside corners where the joint is compressed when the wood moves.

What gauge nails should I use for baseboard?

15 gauge 2" to 2.5" angled finish nails are the standard choice for 3/4" thick baseboard. 16 gauge nails also work but have slightly less holding power. If nailing by hand, use 2" finish nails (6d or 8d size). Always nail into wall studs for a secure hold, not just into drywall.

Do I need to remove flooring before installing baseboard?

No — baseboard is installed after flooring. For hardwood or laminate, leave a 1/4" expansion gap between the flooring and the wall, then cover that gap with the baseboard. The baseboard rests on top of the flooring; it should not be nailed through the flooring into the subfloor, as this would prevent expansion.

Can I install baseboard myself?

Yes — baseboard installation is a popular DIY project. You'll need a miter saw, a finish nailer (or hammer and nail set), a tape measure, a level, caulk, and spackling. Coping inside corners takes practice; watch a few tutorials before your first project. Budget 1–2 hours per room for an experienced DIYer; 2–4 hours for a first-timer.

What is the typical cost to install baseboard professionally?

Professional installation typically costs $1.50–$3.00 per linear foot for labor, on top of material costs. A full house (1,500 sq ft) might total $600–$1,200 in labor plus $400–$900 in material, for an all-in cost of roughly $1,000–$2,100. Complexity, ceiling height, and profile detail all affect price. DIY saves the full labor cost.