TryBuildCalcRoom Skirting Calculator (Length, Pieces, Boxes & Cost)
Estimate skirting length, pieces, boxes, and cost.
Estimate room skirting requirement from room length, width, and openings. Adjust room size, openings, skirting height, piece length, wastage, and price.
🕒 Last updated: July 14, 2026
Inputs
ℹ️Enter total width of doors or openings where skirting is not installed.
ℹ️Corners beyond a simple rectangle's basic 4 — alcoves, bay windows, L-shaped nooks. Each one needs a mitre cut, so more of them raises the suggested wastage below.
Common heights
ℹ️Use tile strip length, board length, or the purchasable skirting piece length.
Common piece lengths
1.2 m pieces would leave about 0.8% offcut on this run vs. 0.8% at 600 mm.
ℹ️Auto-suggested from material, extra corners, and room size — still editable.
Recommended skirting: 25 pieces (3 boxes)
Net skirting length: 13.10 m
Length & Area
Room Perimeter: 14.00 m
Opening Deduction: 0.90 m
Net Skirting Length: 13.10 m
Skirting Area: 1.31 m²
Pieces before Wastage: 22
Recommended Order (incl. 10% wastage)
Final Length (incl. 10% wastage): 14.41 m
Wastage Length: 1.31 m
Final Area: 1.44 m²
Recommended Pieces: 25 pieces
Boxes: 3
Quick Insight
Buy at least 25 pieces (3 boxes) from the same production batch to avoid colour or shade mismatch.
Calculated from room perimeter, opening deductions, skirting height, and piece length.
Assumptions Used
Net length from room perimeter minus opening deductions | Pieces and boxes rounded up to the next whole unit | Colour-matched pieces should come from the same production batch.
Bill of Materials
Main material: 25 pieces + recommended tools
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Bill of Materials
Main material: 25 pieces + recommended tools
Computed items reflect your entered room dimensions and skirting details; consumables below are general recommendations — actual needs vary by product and site.
For Your Job
Skirting Pieces
25 pieces
3 boxes
General Tools & Consumables
Skirting adhesive or fixing screws
Corner and end trim pieces
Flexible sealant (silicone)
Mitre saw or mitre box
Spacers or wedges
Approximate results for planning only. Verify with a professional.
Choosing a material, height, or corner treatment? Read the Skirting Complete Guide →
Installing laminate or SPC/vinyl flooring, not tile, in this room? Use the Flooring Calculator →
Looking for the verification checklist, reference tables, or tips and mistakes?See the complete Skirting Calculator.
Room skirting calculation
This page uses a compact 4 m x 3 m room with a standard 0.9 m door opening — the 14 m perimeter becomes 13.1 m net, 14.41 m after 10% wastage, needing 25 pieces (3 boxes) at 600mm piece length.
0.9 m is a common standard door width, making this a realistic single-door-opening example for a typical bedroom-sized room.
- Room: 4 m x 3 m.
- Opening: 0.9 m.
- Wastage included.
How skirting quantity is calculated
Skirting quantity is calculated from the room perimeter. Opening deductions are subtracted, wastage is added, and the final length is divided by the purchasable piece length.
Step 1 - Calculate Room Perimeter
Step 2 - Deduct Openings
Opening deduction includes the total width of doors, large openings, or wall portions where skirting will not be installed.
Step 3 - Calculate Skirting Area
Step 4 - Add Wastage
Wastage length = Net length x Wastage %
Final length = Net length + Wastage length
Step 5 - Calculate Pieces and Boxes
Pieces required = Final length / Piece length, rounded up
Boxes required = Final pieces / Pieces per box, rounded up
Step 6 - Combine Multiple Rooms (optional)
Pieces and boxes are rounded up per room before summing — not by combining all rooms' lengths into one division — because piece length and pack size are usually different per material (e.g. 600mm tile strips in one room, 2.4m wood boards in another).
Real-World Skirting Calculation Example
This example uses the active inputs above and follows the same steps from the formula section.
Input Values Used
| Input | Value |
|---|---|
| Room size | 4 m × 3 m |
| Opening deduction | 0.9 m |
| Skirting material | Tile skirting |
| Skirting height | 100 mm |
| Piece length | 600 mm |
| Wastage | 10% |
| Pieces per Box | 10 |
Step 1 — Room Perimeter & Net Length
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Room perimeter | 2 × (4 m + 3 m) | 14 m |
| Net skirting length | 14 m − 0.9 m | 13.1 m |
| Skirting area | 13.1 m × 100 mm | 1.31 m² |
Step 2 — Add Wastage
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Wastage length | 13.1 m × 10% | 1.31 m |
| Final length | Net length + wastage length | 14.41 m |
| Final area | 14.41 m × 100 mm | 1.441 m² |
Step 3 — Pieces, Boxes & Cost
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Pieces before wastage | ROUND UP(13.1 / 600 mm) | 22 |
| Recommended pieces | ROUND UP(14.41 / 600 mm) | 25 pieces |
| Boxes required | ROUND UP(25 / 10) | 3 boxes |
Therefore, for this 1.31 m² room you need 25 pieces (3 boxes).
This page keeps things focused on the calculation above. For the full construction guide — verification checklist, reference tables, usage steps, tips, common mistakes, and limitations.See the complete Skirting Calculator.
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Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.