Sq Ft Calculator – Square Feet, Yards and Meters
Pick a room size or enter feet and inches to get instant area totals for one room or several.
Calculate Your Room Area
sq ft
Enter a number like 12, or mix units like 12'6".
Total Area
Square feet
- Square yards
- Square meters
Enter dimensions to see your total.
Results are rounded to 2 decimal places.
Common Room Sizes in Square Feet
Room dimensions can suggest possible uses, but layouts vary. A 10 by 10 foot space might serve as a compact bedroom or office, while larger rectangles can accommodate living areas, garages, or workshops. Use these examples as measurement references rather than required room standards. This table assumes complete rectangular spaces, with both dimensions measured in feet, excluding any additional alcoves.
| Room size (ft) | Area (sq ft) |
|---|---|
| 10 × 10 | 100 |
| 10 × 12 | 120 |
| 12 × 12 | 144 |
| 12 × 15 | 180 |
| 12 × 20 | 240 |
| 15 × 15 | 225 |
| 15 × 20 | 300 |
| 16 × 20 | 320 |
| 20 × 20 | 400 |
| 20 × 25 | 500 |
| 20 × 30 | 600 |
| 25 × 30 | 750 |
| 30 × 30 | 900 |
| 30 × 40 | 1,200 |
Sq Ft Conversion Chart
Compare common floor areas across three units before reading material estimates or property measurements. Divide square feet by nine for square yards, or multiply by 0.09290304 for square meters. Values below are rounded to two decimal places; use the calculator for other amounts and combine rooms before rounding your total.
| sq ft (ft²) | sq yards (yd²) | sq meters (m²) |
|---|---|---|
| 100 | 11.11 | 9.29 |
| 200 | 22.22 | 18.58 |
| 500 | 55.56 | 46.45 |
| 1,000 | 111.11 | 92.90 |
| 2,000 | 222.22 | 185.81 |
| 5,000 | 555.56 | 464.52 |
How to Use the Sq Ft Calculator
- Choose a preset or enter dimensions. Tap a size pill above the inputs to fill both measurements for that area. For example, 12 × 15 immediately produces 180 sq ft. Presets use feet. If your measurements differ, edit Length (ft) or Width (ft). Enter 12.5, 12'6", or 12 ft 6 in for twelve feet and six inches.
- Read the three results. Square feet appears first, followed by square yards and square meters. Every edit updates the results automatically. An empty or unfinished measurement displays a dash instead of a zero. Check both dimensions before using the area to compare material quantities.
- Add another room if needed. Select Add another area beneath the results. Use the new row's presets or enter its measurements manually. Repeat for other rectangular spaces. Each row stays independent, and the total includes completed areas only. Remove a row to exclude it from the project.
Estimating Square Footage for a Whole Room or Unit
To estimate the square footage of a room, sketch the largest complete rectangle within its outline, then measure any recesses or extensions separately. Add those sections only when they lie outside the main rectangle; subtract fixed obstructions only if your project excludes the surface beneath them. A maximum length times maximum width can otherwise include missing corners. For an angled edge or curved boundary, use the area calculator to check the separate shape rather than stretching a rectangle beyond the walls.
For a whole unit, record each room's dimensions and subtotal on a simple worksheet, then add the completed areas. Keep closets, hallways, and doorway transitions clearly labeled so the same surface is not counted twice. This room dimension calculator accepts the measured sides and reports their area; an area alone does not determine a unique pair of dimensions. Keep the original measurements available when comparing the final sum with a plan or listing.
Keep the measured total separate from your material allowance. An initial flooring estimate often adds 5–10% for cuts and spare pieces, with more or less depending on the layout and product instructions. That allowance increases the purchasing quantity, not the room's actual size. Recheck approximate boundaries before ordering, then round the order upward to the coverage sold in each box or roll instead of rounding every tape reading upward.
Sq Ft Calculator FAQ
How do I convert square inches to square feet?
One square foot equals 144 square inches because 12 in × 12 in = 144 sq in. To convert an area from square inches to square feet, divide by 144. For example, 288 sq in ÷ 144 = 2 sq ft.
How many square feet is a 12x12 room?
A room measuring 12 feet by 12 feet contains 144 square feet. Select the 12 × 12 preset to fill both dimensions instantly. This area also equals 16 square yards, assuming a complete rectangular floor with no missing corners or additional sections.
How do I quickly calculate sq ft for a room?
Choose a preset that matches your room, or type its length and width in feet. The result updates immediately without a submit button. For a room between preset sizes, select a nearby preset and then edit either measurement to match your tape measure.
What do 10×10, 12×12, and 20×20 equal in square feet?
When the measurements are in feet, a 10×10 room is 100 square feet, a 12×12 room is 144 square feet, and a 20×20 room is 400 square feet. Multiply the two dimensions; doubling both sides makes the area four times larger.
How do I enter feet and inches in the sq ft calculator?
Type a decimal measurement such as 12.5, or enter 12'6" or 12 ft 6 in. Each represents 12 feet and 6 inches. The calculator also accepts curved quotes copied from a phone. Use the same supported format independently in the length and width fields.
Can I add a second room in the sq ft calculator?
Select Add another area below the results, then enter the next room's dimensions or use its presets. Each area keeps its own measurements and subtotal. The total includes all completed areas; an unfinished or invalid row is excluded and identified beside the total.
How many square yards of carpet do I need?
Carpet, sod, and tile may be sold by the square yard; 1 square yard equals 9 square feet. Measure the area in square feet, divide by 9, and round up to a whole square yard. A 10 × 12 ft room is 120 square feet, or 13.33 square yards: buy 14 square yards before adding any cutting allowance.
How many square yards is 1,000 sq ft?
An area of 1,000 square feet is approximately 111.11 square yards: divide 1,000 by 9. The exact value repeats, so the displayed result is rounded to two decimal places. Match this unit to the seller's price when comparing material quotes.
How do I estimate the square footage of a room?
Measure the largest complete rectangular section, multiply its length by width in feet, and add separately measured recesses or extensions without overlap. Subtract any missing corners. Keep approximate edges marked on your sketch, and treat extra material for cuts as a separate allowance rather than measured room area.
How do I calculate room dimensions from square footage?
For a square room, take the square root of its area to find each side: 196 square feet gives 14 feet per side. For a rectangle, area alone is insufficient; if one side is known, divide by it. With 196 square feet and a 7-foot side, the other side is 28 feet.
How many square feet is a 10x10 room?
A complete room measuring exactly 10 feet by 10 feet is 100 square feet, because 10 × 10 = 100. The result excludes separate extensions and any purchasing allowance. Check the actual tape measurements before using a rounded room-size label to order flooring or carpet.