Skirting Board Calculator for Accurate Orders

A skirting board calculator gives you a sensible starting point before you order, but it is only as accurate as the measurements you put in. For a straightforward square room, the calculation is quick. For a bay window, chimney breast, several doorways or a period-property wall that is far from straight, a little more planning prevents shortages, awkward joins and costly extra delivery.

The aim is not simply to find the room perimeter. You need enough skirting to run continuously around each wall section, account for door openings correctly, choose practical board lengths and leave a realistic allowance for cutting and fitting. That approach gives homeowners a cleaner result and helps trade buyers keep a job moving.

What a skirting board calculator should work out

At its most basic, a calculator adds the length of every wall that will receive skirting. It then subtracts the widths of door openings and adds an allowance for waste. The result is the total linear metres to order.

The basic formula is:

Total wall lengths – door openings + cutting allowance = skirting required

Measure each run of wall in millimetres or metres and use the same unit throughout. A laser measure is useful for longer walls, but check it against a tape measure where walls are uneven or obstructed by radiators, fitted furniture or pipework.

Do not assume that two opposite walls are identical. In newer homes they often are close enough, but extensions, alcoves and older properties can vary. Measuring every wall separately takes only a few extra minutes and makes the order more reliable.

Measuring a standard room

For a rectangular room, measure all four walls. A room measuring 4.2m by 3.6m has a perimeter of 15.6m. If there is one 760mm internal door opening, subtract 0.76m, leaving 14.84m of fitted skirting.

Add at least 10% for cuts, mitres and selection of clean board ends. In this example, 14.84m becomes 16.32m, so ordering around 16.5m to 17m is sensible, depending on the available board lengths and your fitting plan.

A small allowance may look unnecessary on paper, but skirting is not fitted as one continuous roll. Each cut uses material. A damaged edge, an out-of-square corner or a short offcut that cannot be used elsewhere can quickly use up the difference.

Measuring rooms with alcoves, bays and chimney breasts

For more detailed rooms, work around the perimeter in one direction and write down every individual section. Include the returns on chimney breasts, the sides of alcoves and all sections within a bay window. These shorter lengths are easy to miss, particularly where existing skirting has been removed before measuring.

For a bay, measure each face rather than measuring across the front from one side to the other. The same applies to a chimney breast: measure the front, both returns and the wall sections either side. A simple sketch with dimensions is often more useful than trying to remember measurements from room to room.

Use a higher allowance of 12% to 15% where there are several external mitres, short wall runs or irregular angles. Traditional profiles with a pronounced moulding also deserve more care at joins, as mismatched details are more noticeable than they are on a simple square-edge board.

Should you subtract door openings?

In most cases, yes. Skirting does not run through a doorway, so deduct the clear opening width. Measure between the points where the skirting stops, rather than relying on the nominal door size. The opening may be wider than the door leaf, especially where architrave blocks or wider casings are fitted.

There is one practical exception. If the deduction leaves you close to the minimum quantity available, or creates an order with no spare material, it can be better to keep some or all of that length in the calculation. Extra skirting is useful for a future repair, an overlooked return or a fitting issue. This is particularly worthwhile when ordering a bespoke height, finish or less common profile.

Do not deduct openings where skirting will still be fitted, such as beneath a low fitted unit or along a removable boxing detail. Measure the actual visible run required, not the room layout as it appears on a plan.

Choose board lengths before finalising the quantity

The total metreage matters, but the lengths you buy matter just as much. Long walls look better with fewer joins, and longer made-to-specification boards can reduce both fitting time and visible disruption to the profile.

Start by identifying the longest uninterrupted wall in the room. If it is 4.8m long, selecting boards shorter than that will force a joint unless the layout allows a neat break at a doorway, corner or other natural stopping point. A scarf joint can be used where necessary, but it should be planned rather than treated as an afterthought.

Consider how the boards will be carried into the property and moved around stairwells, tight landings and corners. The longest board is not always the most practical choice for every house or flat. For trade projects, check site access before arranging delivery, especially where internal fitting areas are above ground level.

When calculating quantities, map the selected board lengths against the wall runs. This helps you use offcuts efficiently. An offcut from a 4m board may suit a 1.2m alcove section, but it is unlikely to help with a 3.5m wall. Ordering purely by total metreage without considering the cutting plan can leave you with plenty of material in unusable lengths.

Allowance for waste: how much is enough?

A 10% allowance is suitable for many simple rooms with square corners, one or two doorways and a straightforward skirting profile. Increase this where the layout or product makes cutting more demanding.

Allow closer to 15% if the room includes bay windows, chimney breasts, multiple doors, angled walls or lots of external corners. It is also sensible for first-time fitting, where a few practice cuts may be needed before cutting the finished lengths.

Material affects the decision as well. Moisture resistant MDF is consistent and easy to work with, making it a dependable choice for painted interiors. Pine and oak have natural grain and variation, so take more care when planning where joins fall. With an oak finish, for example, a well-positioned joint and grain direction can make a significant difference to the final appearance.

If you are replacing skirting in stages across a home, retain a labelled offcut from each profile and finish. It can be useful later for a small repair, a cupboard alteration or matching trim around a new installation.

Check profile, height and finish before ordering

A correct quantity will not solve a mismatch in style. Before placing the order, confirm the profile name, height, thickness, material and finish. A taller board can change the feel of a room, but it must work with existing door architrave, sockets, flooring transitions and any fitted furniture.

For a coordinated result, match the skirting profile with the architrave where appropriate. In period properties, a traditional ogee or torus-style detail may suit the room better than a modern square-edge design. In contemporary spaces, cleaner profiles can keep the join between wall and floor understated.

Order a free sample where there is any doubt about profile scale, material or paint finish. Looking at a sample against the wall, flooring and architrave is more dependable than making the decision from a screen image alone.

Common measuring errors to avoid

The most common mistake is measuring only the main four walls and forgetting recesses, returns and bay sections. The next is ordering the exact fitted metreage with no allowance for cuts. Both create pressure on fitting day, when a missing 300mm can hold up an otherwise completed room.

Also check whether old skirting has been fitted behind radiator pipes or around boxing that will remain in place. Measure the new installation line, not just the exposed length of old board. If flooring is being replaced, decide the fitting order in advance. Skirting is usually fitted after flooring for the cleanest edge, although project requirements can vary.

For larger orders, set measurements out room by room, then add the totals. This makes it easier to separate profiles, heights or materials where bedrooms, hallways and reception rooms have different requirements. It also provides a clear record if another person is placing the order or fitting the boards.

A skirting board calculator is there to make ordering simpler, not to replace a final check of the room and board lengths. Measure carefully, allow for the way the skirting will actually be cut and fitted, and keep a little spare. If you need help turning a room-by-room list into an order, the team at My Skirting Boards can help you check the practical details before manufacture.