Square Footage Calculator

What is the Free Square Footage Calculator?

The free Square Footage Calculator computes the floor area of one or more rooms instantly — just enter the length and width of each room and the tool sums the total in square feet and square metres. It also includes a built-in paint estimator that tells you how many gallons (and litres) of paint you need for one or two coats, based on standard coverage of 400 sq ft per gallon. Perfect for flooring quotes, renovation budgets, and painting projects.

• → Calculate the total floor area of a house or apartment before buying flooring
• → Estimate how much paint you need before heading to a hardware store
• → Work out the square footage of a room to request accurate contractor quotes
• → Calculate room area in square metres for tiling or carpeting orders
• → Add multiple rooms to get the total project area for a full renovation

How to Use the Free Square Footage Calculator

1. 1 Enter the Length and Width of the first room in the fields provided.
2. 2 Choose your measurement unit — feet or metres — using the toggle.
3. 3 Click + Add Room to add more rooms and enter their dimensions.
4. 4 The Total Area is shown in both sq ft and m² and updates instantly.
5. 5 Scroll to the Paint Estimator section to see how many gallons and litres of paint you need for 1-coat and 2-coat coverage.

Key Features

• 🏠
  Multi-room support

  Add as many rooms as you need — the tool sums all areas automatically.
• 🔄
  Feet and metres

  Switch between imperial and metric units at any time.
• 🎨
  Paint estimator

  Automatically calculates litres and gallons needed for 1-coat and 2-coat coverage.
• 📐
  Dual unit output

  Always shows results in both sq ft and m² side by side.

Example Usage

Living room: 15 ft × 20 ft
Master bedroom: 12 ft × 14 ft
Bedroom 2: 10 ft × 12 ft

Total Area: 588 sq ft (54.6 m²)

Paint Estimator:
1 coat: 1.47 gal ≈ 5.6 L
2 coats: 2.94 gal ≈ 11.1 L

Frequently Asked Questions about the Free Square Footage Calculator

What is the free Square Footage Calculator?

Calculate the square footage of rooms and total floor area for flooring, painting, and more.

Is the Square Footage Calculator free to use?

Yes, the Square Footage Calculator is completely free. No account, subscription, or signup is required — ever.

Does my data get uploaded anywhere?

No. The Square Footage Calculator runs entirely in your browser. Your data is never sent to any server.

Does it work offline?

Yes. Once the page has loaded, the tool works without an internet connection.

Which browsers are supported?

All modern browsers — Chrome, Firefox, Safari, and Edge. No plugins or extensions required.

How many square feet is a typical bedroom?

A small bedroom is typically 100–120 sq ft (9–11 m²). A standard bedroom is around 130–150 sq ft (12–14 m²). A master bedroom is often 200–300 sq ft (18–28 m²). These are general guidelines — actual sizes vary widely by country and building type.

How much paint do I need per square metre?

A standard interior paint covers approximately 10–12 m² per litre for one coat. This calculator uses a coverage rate of 400 sq ft (37.2 m²) per gallon, which equals roughly 10.7 m² per litre — a typical industry standard for planning purposes. Always check the coverage stated on your specific paint tin, as it varies by brand and finish.

Does the calculator account for walls and ceiling?

This calculator measures floor area only — useful for flooring, tiling, and carpet orders. For wall and ceiling paint, you would need to also measure wall height and subtract area for doors and windows. A rough rule of thumb: multiply floor area by 3.5 to estimate total wall + ceiling area for a standard-height room.

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