# Square Footage Calculator

> Calculate rectangular area with quantity and deductions.

Page: https://freecalculator.tech/tools/square-footage-calculator

## How do I work out square footage?

Square footage is length multiplied by width for each rectangular area, added together.

## Formula

Net area = length × width × quantity − deductions. Dimensions are converted to square feet.

- Net area = length × width × quantity − deductions. Dimensions are converted to square feet.
- Inputs used: Dimension unit, Length, Width, Number of equal areas, Total deduction.
- Edge handling: Length is required.; Length cannot be negative.; Length must be no more than 1000000000.; Width is required.; Width cannot be negative..

## Inputs

- Dimension unit
- Length
- Width
- Number of equal areas
- Total deduction

## Worked example: Two 12 × 10 ft areas

Gross area is 240 sq ft before deductions.
1. Start with Dimension unit: ft, Length: 12, Width: 10, Number of equal areas: 2, Total deduction: 0.
2. Apply the method: Net area = length × width × quantity − deductions. Dimensions are converted to square feet.
3. Gross area is 240 sq ft before deductions.

## Common questions

### How do I work out square footage?

Square footage is length multiplied by width for each rectangular area, added together. Check the formula, example, and limitations on this page before using the result for a real home decision.

### Can I combine different room sizes?

Calculate each different rectangle separately and add the results; quantity handles repeated equal areas. Check the formula, example, and limitations on this page before using the result for a real home decision.

### What belongs in deductions?

Use the combined square footage of openings or excluded areas. Check the formula, example, and limitations on this page before using the result for a real home decision.

### How do I use the Square Footage Calculator?

Enter the required values for Dimension unit, Length, Width, Number of equal areas, Total deduction. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Square Footage Calculator use?

Net area = length × width × quantity − deductions. Dimensions are converted to square feet. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.

### Can the Square Footage Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- This is a planning estimate based on your inputs and assumptions, not an exact contractor, installer, or supplier quote.
- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this square footage calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Cite this page

- APA: Free Calculator. (n.d.). Square Footage Calculator. https://freecalculator.tech/tools/square-footage-calculator
- MLA: "Square Footage Calculator." Free Calculator, https://freecalculator.tech/tools/square-footage-calculator.
- Link: Square Footage Calculator — Free Calculator, https://freecalculator.tech/tools/square-footage-calculator