Square Footage Calculator: Feet, Inches & Flooring Area
Calculate room square footage from feet and inches, convert to square yards, and add a flooring waste allowance. Includes a worked US room example. All measurements use US customary units. Defaults are examples; use actual site dimensions and product coverage.
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Results update live as you type. Estimates only — not financial, tax, or investment advice.
The Formula
Area ft² = (length ft + inches ÷ 12) × (width ft + inches ÷ 12); yd² = ft² ÷ 9
Understanding the Square Footage Calculator: Feet, Inches & Flooring Area
Example: a room 12 feet 6 inches long and 10 feet wide measures 125 square feet, or 13.89 square yards. With 10% extra, plan for 137.50 square feet of material.
Enter the whole feet and remaining inches separately: 12 feet 6 inches is 12.5 feet, not 12.6 feet. The base area is the measured floor area; the adjusted result is a material estimate. For multiple rooms, add their areas before allowing for waste.
For flooring, compare the adjusted square footage with the coverage printed on each carton. Do not round each room independently before adding areas; round purchase quantities after the total is known.
Frequently Asked Questions
How do I measure an irregular area?
Split it into non-overlapping rectangles, calculate each separately, and add the base quantities. Apply your extra allowance once to the total.
What does the extra allowance cover?
The percentage adds material for cuts, uneven surfaces, settling or handling losses. It is adjustable and is not a universal recommendation. Confirm your order with your supplier.
How do I enter 12 feet 6 inches?
Enter 12 in the feet field and 6 in additional inches. Alternatively enter 12.5 feet and 0 additional inches; do not enter the same six inches twice.