Square Footage Calculator
Calculate rectangular area with quantity and deductions.
Net square footage
120sq ft
- Gross area
- 120 sq ft
- Square metres
- 11.15 m²
- Assumption
- 1 equal rectangular area(s)
Results assume rectangular areas and exact entered dimensions.
What this calculator does
Find square feet and square metres from dimensions, repeated equal areas, and optional deductions.
Inputs and what they mean
- Dimension unit
- — choice value.
- Length
- — number value.
- Width
- — number value.
- Number of equal areas
- — number value.
- Total deduction
- — number value.
How to use it
- Enter the project dimensions and choose their unit.
- Adjust waste, coverage, quantity, and other assumptions.
- Use the rounded purchase estimate as a planning guide.
Formula
Net area = length × width × quantity − deductions. Dimensions are converted to square feet.
Worked example
Two 12 × 10 ft areas
Gross area is 240 sq ft before deductions.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
This is a planning estimate based on your inputs and assumptions, not an exact contractor, installer, or supplier quote.