Trim Calculator
Lengths, optional fasteners, and rough cost.
Skirting / Baseboard / Trim Calculator
Estimate trim lengths from room size, stock length, room count, and waste allowance. Optional door deductions, nail spacing, and price inputs add practical purchase guidance while keeping the main estimate transparent.
Trim Inputs
Trim planning guide
Skirting, baseboard, architrave, and trim estimates are based on linear length, but the purchase decision also depends on stock lengths, mitres, joins, returns, waste, and whether each room uses the same profile.
Use this calculator when you know the room perimeter or the individual wall lengths. It is helpful for checking how many lengths to buy and whether longer stock lengths will reduce joins and offcuts.
Before cutting trim
- Subtract door openings only where trim will not run through the opening.
- Add waste for mitres, coping, damaged ends, and matching profile direction.
- Group rooms by trim profile and height so the purchase list stays accurate.
- Check fasteners, adhesive, filler, primer, and paint as separate materials.
The calculator gives a purchase estimate, but final cuts should be planned from actual wall measurements after flooring and wall finishes are in place.
Worked example
A 4 m by 3 m room has a 14 m perimeter. Deducting one 0.9 m door opening leaves 13.1 m. With 10% allowance the planning run is 14.41 m; if trim is sold in 2.4 m lengths, divide by 2.4 and round up to 7 lengths. Mitres, returns, profile direction, and damaged ends may require more.
Trim calculator FAQ
Does this optimise offcuts?
No. The page uses linear run plus waste and then rounds to whole stock lengths. Plan the individual cuts separately when offcut savings matter.
Can I deduct doors?
Yes. Enter a door count and average door width to reduce the total run before waste is applied.