Square Footage Calculator

Calculate floor area in square feet, square yards, and square meters.

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Length (ft)

Width (ft)

Quantity of areas

Result

Enter values to calculate.

Summary

Waiting for input

Detail

Waiting for input

Calculate the total floor or wall area in square feet, square yards, and square meters — for a single space or several identical areas at once.

How It Works

How Square Footage Calculator Works

The calculator multiplies length by width to get the area of one section, then multiplies by the quantity you enter if you're measuring several identical areas (like multiple rooms of the same size), giving a combined total.

That total is also converted to square yards (divided by 9, since a square yard is 9 square feet) and square meters (multiplied by 0.092903), which is useful when comparing against flooring or material quantities quoted in different units.

Worked Example

See It In Action

Three identical 12 ft × 10 ft rooms give a single-room area of 120 ft² and a combined total of 360 ft² — equal to 40 yd² or about 33.45 m².

Real-World Use Cases

Who Uses Square Footage Calculator and Why

Working out total floor area across several identical rooms before ordering flooring or carpet.
Getting a quick square footage figure to compare against a real estate listing.
Estimating paint or turf coverage needs for a space before buying material.

Common Mistakes

Mistakes to Avoid

Measuring wall-to-wall without accounting for closets, alcoves, or irregular room shapes — a simple length-times-width calculation only works cleanly for rectangular spaces; break an L-shaped room into two rectangles and add them separately.
Setting quantity to the number of rooms without first confirming they're actually the same size — even small differences (a closet in one bedroom but not another) mean they aren't truly identical.
Mixing units mid-measurement, such as measuring one wall in feet and another in inches before entering them.

Pro Tips

Tips for Best Results

For an irregularly shaped room, run the calculator once per rectangular section and add the results together rather than trying to average one length and width for the whole space.
Keep a note of which room each calculation was for if you're running it several times for a whole-house flooring or paint estimate.

Troubleshooting

Fixing Common Problems

My total doesn't match what a room's listing states. — Listed square footage sometimes includes or excludes areas like closets, garages, or unfinished space differently than a simple floor measurement — measure the actual usable floor area you care about instead of relying on the listing figure.

Glossary

Terms Explained

Square yard: An area unit equal to 9 square feet, commonly used for carpet and turf pricing.

Footprint: The flat, ground-level area a structure or room occupies, as opposed to its sloped or vertical surface area.

FAQ

Frequently Asked Questions

How do I calculate an irregularly shaped room?

Break the space into rectangular sections, calculate each one's area separately (using quantity 1 each time), and add the results together — the calculator itself assumes a single rectangular shape per calculation.

What does the "quantity" field do?

It multiplies the single calculated area by however many identical areas you're measuring — useful for multiple same-sized rooms, tiles sections, or repeated units, rather than re-entering the same dimensions multiple times.

Why does the calculator show square yards and square meters?

Flooring, carpet, and turf are commonly sold by the square yard in the U.S., while many building materials and international specifications use square meters — having both saves you from converting manually.