100 sq ft at 6 in width
200 LF
6 in
LF = (100 x 12) / 6
Crown Molding Calculator
Estimate crown molding length and pieces from the room perimeter.
All results are estimates. Always verify measurements on site.
Estimator guide
Planning notes for Crown Molding Calculator
A 12 x 15 ft room needs 54 LF of crown before waste and cut allowance.
Good for
- ceiling trim
- crown molding orders
- room-by-room estimates
How to use it
- Measure each wall at ceiling height.
- Add the wall runs.
- Add waste for inside and outside corners.
Formula check: Crown molding LF equals the ceiling perimeter before waste.
Quick Conversions
200 sq ft at 5.5 in width
436.4 LF
5.5 in
LF = (200 x 12) / 5.5
500 sq ft at 12 in roll width
500 LF
12 in roll
LF = (500 x 12) / 12
1000 sq ft at 16 in width
750 LF
16 in
LF = (1000 x 12) / 16
Use Cases
Flooring and Decking
LF = area / plank width
Example
240 sq ft at 6 in width
480 LF
Baseboard and Trim
LF = room perimeter - openings
Example
120 ft perimeter + 2 doors
168 LF
Fencing
Panels = fence line / panel width
Example
200 ft fence line
25 panels
Freight Pallets
LF = trailer length used
Example
53 ft trailer length
212 LF
Board Feet and Lumber
LF = board feet x 12 / size
Example
100 BF, 2 x 6
100 LF
Frequently Asked Questions
A linear foot is one foot of length. It does not include width or thickness unless you are converting from area or board feet.
Pro Tip
A waste factor of 5-15% helps cover cuts, mistakes, and layout adjustments. When in doubt, round up.
Calculator Pages
Linear feet calculatorSquare feet to linear feetLinear feet to square feetHow to calculate linear feetFlooring linear feetBaseboard and trimFence linear feetFreight linear feetBoard feet to linear feetPrice per linear footDeck board linear feetDecking linear feetSiding linear feetShiplap linear feetTongue and groove LFCarpet linear feetFabric linear feetVinyl flooring linear feetLaminate flooring LFHardwood flooring LFMolding linear feetCrown moldingShoe moldingQuarter roundWall trimFence board calculatorFence picket calculatorPallet linear feetLTL linear feetTrailer space calculatorLinear foot priceLumber linear feetLineal feet calculatorLinear footage calculatorLF in a square footFigure LF for flooringBaseboard LF guideFence LF guideFreight LF guideSquare yards to linear feetLinear feet to square yardsCabinet linear feetKitchen cabinet LFFreight densityFreight class density