What this calculator does
This tool turns your measurements into a consistent planning estimate you can review before pricing or starting work. It is useful during early takeoffs, option comparisons, and on-site checks where transparent math matters.
How the calculation works
Formula
Each area = length × width. Combined area is the sum of every section.Worked example
A 12 × 10 ft room plus a 6 × 4 ft closet totals 144 ft² before waste.
How to measure
- 01Measure each rectangle at its longest finished edges.
- 02Divide L-shaped spaces into non-overlapping rectangles.
Common mistakes to avoid
- Overlapping sections
- Mixing feet and metres
- Applying waste twice
Limits of this estimate
Irregular boundaries, off-square rooms, and installation patterns may require additional allowance.
Frequently asked questions
Can I add several rooms?
Yes. Add one section for each rectangular room or portion.
Why show both unit systems?
The converted total helps compare products sold in different units.