Method
How to use this calculator
- 01
Measure each room at its longest length and width in feet.
- 02
Add a row for every rectangle; split L-shaped rooms into separate rectangles.
- 03
Set quantities for repeated rooms and choose a waste allowance.
- 04
Review the room subtotal, adjusted area, and suggested order quantity.
Good for
Useful planning situations
- Whole-home flooring estimates
- Repeated bedrooms or apartment units
- L-shaped rooms split into rectangles
Working model
Assumptions
- Every row is a rectangle measured in feet.
- Waste is applied once to the combined area.
- Results are rounded up only for the final order quantity.
Before ordering
Limits and checks
- Curves, angled walls, cabinets, and fixed islands require separate measurement judgment.
- This does not account for carton coverage or installation direction.
- Verify field dimensions and the manufacturer’s waste guidance before ordering.
Field notes
Frequently asked questions
How do I measure an L-shaped room?
Divide it into non-overlapping rectangles, add one row for each rectangle, and use clear labels so the pieces can be checked.
Should I subtract closets or cabinets?
Include closets that will receive flooring. Subtract permanently covered areas only when the installation plan truly excludes them.
Is the rounded order area the same as cartons?
No. Divide the adjusted area by the exact coverage printed on one carton, then round cartons up.