How do I calculate the square footage of a room?

To calculate room square footage, multiply the length of the room by its width in feet. For example, a 12 ft × 14 ft room equals 168 square feet. For irregular rooms, divide the space into rectangles, calculate each, and add them together.

How many square feet is a typical bedroom?

A small bedroom is typically 100–150 sq ft, a standard bedroom is 150–200 sq ft, and a master bedroom is usually 200–300 sq ft.

How much paint do I need for a room?

One gallon of paint covers approximately 350 sq ft per coat. For two coats, divide your room's square footage by 175 to get gallons needed. Always add 10% for waste.

Room Square Footage Calculator – Calculate Any Room Instantly

How to measure a room

Rectangular rooms

Measure the length and width at the widest points in feet, then multiply: Length × Width = Square Footage. Include closets and alcoves if they share the same floor.

Need to work backwards from sq footage? Try our room dimension calculator.

Common room sizes (US)

Small bedroom100–150 sq ft
Standard bedroom150–200 sq ft
Master bedroom200–300 sq ft
Living room250–400 sq ft
Dining room100–180 sq ft
Kitchen100–200 sq ft

Material estimates (10% waste included)

How to measure a room

Rectangular rooms

Common room sizes (US)

More free calculators

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Room Dimension Calculator

How to Calculate Sq Footage