Skirting Board Calculator UK
Estimate skirting board length, full board count, doorway deductions, mitre waste, adhesive, caulk and budget before you cut or order timber, MDF or primed boards.
Skirting Board Result
Whole-board order4 boards
The room needs 14.76 m before waste and 16.53 m after cut allowance, so buy 4 full boards of 4.2 m.
14.76 m
16.53 m
16.80 m
GBP 72.00
2
2
Touch up cuts
0.27 m
What The Skirting Board Result Includes
The main result is the number of full board lengths to buy. The calculator starts with the wall run, deducts door openings where skirting will not be fitted, applies a waste percentage for cutting, scribing and mitres, then rounds up to a whole number of supplied board lengths. That rounded board count is the number to take to a merchant or DIY store.
The result also shows adhesive and caulk as a planning line. These are only practical estimates because coverage depends on wall straightness, board height, fixing style, gaps and product bead size. If you are fixing to uneven masonry or old plaster, you may use more adhesive and more caulk than a neat new-build room. If you nail to timber grounds, adhesive may be reduced, but caulk and filler still matter.
For renovation work, measure after old skirting is removed where possible. Old boards can hide bowed walls, pipe notches, fireplace returns, boxed-in services, broken plaster and uneven floors. A calculator can size the order, but the room still decides where joints should fall and which lengths should be saved for visible walls.
How To Measure For Skirting Boards
Sketch Each Wall
Draw the room as straight wall runs. Mark doors, fireplaces, cupboards, bay returns and any wall that will not receive skirting.
Measure Along The Floor
Measure where the skirting will sit, not half-way up the wall. Floors and plaster are not always square, especially in older houses.
Deduct True Openings
Deduct only the opening width where no skirting will be fitted. Do not deduct architrave faces if the skirting runs into them.
Plan Joints Before Cutting
Put full lengths on the most visible walls first. Use shorter offcuts behind furniture, in alcoves or on short returns.
Skirting Board Formula And Rounding
Room perimeter = 2 x room length + 2 x room width.
Net wall length = wall run – door openings x average door width.
Order length = net wall length x (1 + waste percentage / 100).
Board count = order length / supplied board length, rounded up.
Total length bought = board count x supplied board length.
Offcut allowance = total length bought – order length.
Board cost = board count x price per board.
Rounding up is important because skirting boards are bought in fixed lengths. Buying exactly the net run rarely works: mitres, scribed internal corners, end cuts, splits, knots, damaged ends and misplaced cuts all take length. A 10% to 15% allowance is common for simple rooms. Use a higher allowance for many external corners, tall moulded boards, awkward bays, stairs, old walls or if the board profile must match at visible joints.
Worked Skirting Board Examples
| Room | Inputs | Likely Order Result | Fitting Note |
|---|---|---|---|
| Small bedroom | 3.0 m by 2.5 m, one 0.84 m door, 10% waste, 4.2 m boards. | About 3 boards. | Use one full board on the most visible wall if possible. |
| Living room | 4.2 m by 3.6 m, one door, 12% waste, 4.2 m boards. | About 4 boards. | Plan joints behind furniture and avoid tiny returns beside a fireplace. |
| Hallway | Measured wall run 9 m, two door openings, 15% waste, 3.6 m boards. | Often 3 boards, but offcuts can be tight. | Doorways create many short pieces; label each run before cutting. |
| Bay window room | Measured wall run rather than rectangle, external corners entered, 18% waste. | Higher board count than a square room. | Mitres and scribing make waste more likely than straight walls. |
Board Length, Profile And Material Choices
MDF Boards
Primed MDF is stable, smooth and common for painted skirting. It is not ideal where persistent moisture is expected. Seal cut ends and avoid leaving raw edges against wet floors.
Softwood Boards
Softwood can be stained or painted and may suit older houses. Check for knots, twists and damaged edges before cutting, and allow more waste if the board quality is mixed.
Profile Matching
Ogee, torus, chamfered and Victorian profiles can differ between suppliers. Buy all visible boards from the same profile range if joints need to line up neatly.
Cutting And Fixing Checks
Internal corners are often scribed rather than simply mitred because walls are rarely square. External corners need accurate mitres and may need a test piece. Long walls may need a scarf joint rather than a square butt joint if the join is visible. The calculator cannot decide those cuts, but the corner counts remind you where extra material and time may be needed.
Before fixing, check for cables, pipes and heating runs. Old skirting can hide radiator pipes or cable drops. Use suitable fixings for the wall type, keep adhesive away from finished flooring, and paint or seal cut ends where moisture may reach the board. If a room has damp, solve the cause before fitting new skirting; new boards will not repair a damp wall.
Skirting Board Calculator FAQ
How much extra skirting board should I buy?
For a simple rectangular room, 10% to 15% is a common allowance. Use more for bays, stairs, lots of external corners, poor walls or expensive profiles where a wrong cut is costly.
Should I deduct doors from the wall length?
Deduct the clear opening where skirting will not be fitted. If skirting runs into architrave, deduct only the part that is genuinely missing.
What board length should I enter?
Enter the length sold by your supplier, such as 2.4 m, 3.6 m or 4.2 m. The board count changes because the calculator rounds up to full lengths.
Does the result include stairs?
No. Stair strings, landings and angled cuts need a separate measured run. Use measured wall run mode and a higher waste allowance for stair areas.
How many adhesive tubes do I need?
The adhesive line is a planning estimate based on the order length. Actual use depends on board height, wall flatness, bead size and whether you also pin or screw the boards.
Can I use the offcut allowance as spare material?
Sometimes, but do not rely on every offcut being useful. Some offcuts are lost to angled ends, damaged pieces or lengths that are too short for the remaining wall.
Sources
- Health and Safety Executive. (n.d.). Woodworking Health and Safety. HSE. https://www.hse.gov.uk/woodworking/
- Health and Safety Executive. (n.d.). Manual Handling at Work. HSE. https://www.hse.gov.uk/msd/manual-handling/index.htm
- British Standards Institution. (2021). BS 8201 Code of Practice for Flooring of Timber, Timber Products and Wood Based Panel Products. BSI.
- Construction Industry Training Board. (n.d.). Site Safety Plus Publications. CITB. https://www.citb.co.uk/