Square Foot Calculator Inches
Convert inches to square feet instantly. 12×12in=1ft², 24×24in=4ft², 36×36in=9ft². Full tile reference table, countertop examples, and sq in ↔ sq ft guide.
Inches to Square Feet Calculator
Enter length and width in inches. The calculator shows area in both square inches and square feet.
Square Inches to Square Feet — Complete Conversion Guide
When your measurements are in inches — tile dimensions, countertop lengths, shelf widths, cabinet faces, backsplash panels — use this calculator to get square footage instantly. Enter length and width in inches to get area in sq ft, sq m, sq yd, and acres.
The Conversion Formula
One square foot = 12 in × 12 in = 144 square inches. To go from sq in to sq ft: divide by 144. To go from sq ft to sq in: multiply by 144. This is the single most important number for inch-to-feet conversions.
Step-by-Step Instructions
- Measure length and width in inches with a tape measure or ruler.
- Multiply length × width to get area in square inches.
- Divide by 144 to convert to square feet.
- Add 10% waste when ordering tile, flooring, or backsplash material.
Worked Example: Kitchen Countertop
96 × 25 = 2,400 square inches
2,400 ÷ 144 = 16.67 square feet (1.55 m²)
For stone or quartz countertop: 16.67 sq ft is a typical single run of kitchen counter. An L-shape with two runs of 96×25 and 60×25 = 3,900 sq in ÷ 144 = 27.08 sq ft total.
Worked Example: Bathroom Backsplash
48 × 18 = 864 square inches
864 ÷ 144 = 6.00 square feet
For 3×6 subway tiles (18 sq in each): 864 ÷ 18 = 48 tiles + 10% = 53 tiles to order
Worked Example: Room Floor in Inches
144 × 168 = 24,192 square inches
24,192 ÷ 144 = 168 square feet (15.61 m²)
For 12×12 tile: 24,192 ÷ 144 = 168 tiles + 10% = 185 tiles
Complete Tile Size Reference — Square Feet per Tile
| Tile Size (inches) | Sq Inches / Tile | Sq Ft / Tile | Tiles per 100 sq ft | With 10% Waste |
|---|---|---|---|---|
| 2 × 2 in | 4 sq in | 0.028 sq ft | 3,600 tiles | 3,960 |
| 3 × 6 in (subway) | 18 sq in | 0.125 sq ft | 800 tiles | 880 |
| 4 × 4 in | 16 sq in | 0.111 sq ft | 900 tiles | 990 |
| 4 × 12 in | 48 sq in | 0.333 sq ft | 300 tiles | 330 |
| 6 × 6 in | 36 sq in | 0.25 sq ft | 400 tiles | 440 |
| 6 × 24 in | 144 sq in | 1.00 sq ft | 100 tiles | 110 |
| 9 × 9 in | 81 sq in | 0.5625 sq ft | 178 tiles | 196 |
| 12 × 12 in | 144 sq in | 1.00 sq ft | 100 tiles | 110 |
| 12 × 24 in | 288 sq in | 2.00 sq ft | 50 tiles | 55 |
| 16 × 16 in | 256 sq in | 1.778 sq ft | 56 tiles | 62 |
| 18 × 18 in | 324 sq in | 2.25 sq ft | 45 tiles | 50 |
| 24 × 24 in | 576 sq in | 4.00 sq ft | 25 tiles | 28 |
| 24 × 48 in | 1,152 sq in | 8.00 sq ft | 13 tiles | 14 |
| 36 × 36 in | 1,296 sq in | 9.00 sq ft | 12 tiles | 13 |
| 48 × 48 in | 2,304 sq in | 16.00 sq ft | 7 tiles | 8 |
Common Surfaces — Inches to Square Feet
| Surface | Dimensions (inches) | Sq Inches | Square Feet | Square Meters |
|---|---|---|---|---|
| Standard door | 36 × 80 in | 2,880 sq in | 20.00 sq ft | 1.86 m² |
| Sliding glass door | 72 × 80 in | 5,760 sq in | 40.00 sq ft | 3.72 m² |
| Kitchen countertop run | 96 × 25 in | 2,400 sq in | 16.67 sq ft | 1.55 m² |
| Bathroom vanity top | 60 × 22 in | 1,320 sq in | 9.17 sq ft | 0.85 m² |
| Standard window | 36 × 48 in | 1,728 sq in | 12.00 sq ft | 1.11 m² |
| Shower surround panel | 60 × 72 in | 4,320 sq in | 30.00 sq ft | 2.79 m² |
| Twin mattress | 75 × 38 in | 2,850 sq in | 19.79 sq ft | 1.84 m² |
| Full mattress | 75 × 54 in | 4,050 sq in | 28.13 sq ft | 2.61 m² |
| Queen mattress | 80 × 60 in | 4,800 sq in | 33.33 sq ft | 3.10 m² |
| King mattress | 80 × 76 in | 6,080 sq in | 42.22 sq ft | 3.92 m² |
| Shelf (standard) | 48 × 12 in | 576 sq in | 4.00 sq ft | 0.37 m² |
| Cabinet face (30" wide) | 30 × 30 in | 900 sq in | 6.25 sq ft | 0.58 m² |
Square Inches to Square Feet Quick-Reference Table
| Square Inches | Square Feet | Square Meters |
|---|---|---|
| 144 sq in | 1.00 sq ft | 0.0929 m² |
| 288 sq in | 2.00 sq ft | 0.1858 m² |
| 432 sq in | 3.00 sq ft | 0.2787 m² |
| 576 sq in | 4.00 sq ft | 0.3716 m² |
| 720 sq in | 5.00 sq ft | 0.4645 m² |
| 1,000 sq in | 6.94 sq ft | 0.6452 m² |
| 1,296 sq in | 9.00 sq ft | 0.8361 m² |
| 1,440 sq in | 10.00 sq ft | 0.9290 m² |
| 2,304 sq in | 16.00 sq ft | 1.4864 m² |
| 3,600 sq in | 25.00 sq ft | 2.3226 m² |
| 5,184 sq in | 36.00 sq ft | 3.3445 m² |
| 10,000 sq in | 69.44 sq ft | 6.452 m² |
| 14,400 sq in | 100.00 sq ft | 9.290 m² |
How to Calculate Tiles Needed from Inch Dimensions
- Find room area in sq in: room length (in) × room width (in).
- Find tile area in sq in: tile length (in) × tile width (in).
- Divide: room sq in ÷ tile sq in = number of tiles needed.
- Add waste: multiply by 1.10 for straight lay, 1.15 for diagonal or pattern cuts.
- Round up to the nearest full box.
Room: 144 in × 168 in = 24,192 sq in
Tile: 18 × 18 = 324 sq in per tile
24,192 ÷ 324 = 74.67 → 75 tiles base
75 × 1.10 = 83 tiles to order (includes 10% waste)
Backsplash Material Calculator
| Backsplash Area (inches) | Sq Feet | 3×6 Subway Tiles Needed | 4×4 Tiles Needed |
|---|---|---|---|
| 36 × 18 in | 4.50 sq ft | 37 tiles (+10%) | 42 tiles (+10%) |
| 48 × 18 in | 6.00 sq ft | 53 tiles (+10%) | 55 tiles (+10%) |
| 60 × 18 in | 7.50 sq ft | 66 tiles (+10%) | 69 tiles (+10%) |
| 72 × 18 in | 9.00 sq ft | 79 tiles (+10%) | 82 tiles (+10%) |
| 96 × 18 in | 12.00 sq ft | 106 tiles (+10%) | 110 tiles (+10%) |
When to Measure in Inches vs. Feet
| Use Inches For | Use Feet For |
|---|---|
| Tile sizing and counting | Room flooring projects |
| Countertop fabrication | Outdoor patios and decks |
| Backsplash installation | Carpet and LVP ordering |
| Shelf and cabinet faces | Wall painting estimates |
| Window glass sizing | Land and property areas |
| Picture frames and artwork | Large-format tile (24"+ rolls) |
| Craft and sewing projects | Comparing home listing sizes |
Mixing Inches and Feet — Common Scenario
If one measurement is in feet and the other in inches (e.g., a 10 ft wall with 18 in-wide tiles), convert everything to the same unit first:
10 ft = 120 inches. 120 ÷ 18 = 6.67 tiles → need 7 tiles (with one cut tile at the end).
For the full wall (10 ft wide × 8 ft tall = 120 in × 96 in = 11,520 sq in ÷ 144 = 80 sq ft).
18×18 tile = 2.25 sq ft per tile → 80 ÷ 2.25 = 36 tiles + 10% = 40 tiles
Related Calculators
If your measurements are in feet and inches combined (like 12 ft 6 in), use the feet and inches calculator. For rooms measured in whole feet, use the room square footage calculator. To convert metric measurements, use the centimeters to square feet calculator or the millimeters to square feet calculator.
Frequently Asked Questions
How do I convert square inches to square feet? +
Divide the area in square inches by 144. For example, 1,440 sq in ÷ 144 = 10 sq ft. This works because 1 square foot = 12 × 12 = 144 square inches.
How do I calculate square footage from inch measurements? +
Multiply length (inches) × width (inches) to get square inches, then divide by 144. Or use this calculator — enter length and width in inches and get sq ft instantly. Example: 96 in × 25 in = 2,400 sq in ÷ 144 = 16.67 sq ft.
How many square inches are in a square foot? +
There are exactly 144 square inches in 1 square foot (12 inches × 12 inches = 144 sq in). To convert sq in to sq ft: divide by 144. To convert sq ft to sq in: multiply by 144.
How many square feet is a 12×12 inch tile? +
12 × 12 = 144 square inches ÷ 144 = exactly 1 square foot. A 12×12 inch tile covers exactly 1 sq ft, so tile count = total sq ft for a perfectly aligned layout.
How many square feet is a 24×24 inch tile? +
24 × 24 = 576 square inches ÷ 144 = exactly 4 square feet. For 200 sq ft of floor you'd need 200 ÷ 4 = 50 tiles, plus 10% waste = 55 tiles.
How many square feet is a 36×36 inch tile? +
36 × 36 = 1,296 sq in ÷ 144 = 9 square feet per tile. Large-format tiles like 36×36 cover 9 sq ft each, so 100 sq ft of floor needs only 12 tiles (plus waste).
How do I calculate square footage of a countertop in inches? +
Measure length and width in inches (e.g., 96 in × 25 in). Multiply: 96 × 25 = 2,400 sq in. Divide by 144: 2,400 ÷ 144 = 16.67 sq ft. For an L-shaped countertop, measure each section separately and add the totals.
When should I measure in inches instead of feet? +
Use inches for smaller surfaces: countertops, tiles, shelves, picture frames, cabinet faces, backsplashes, window glass, and any surface under 10 feet. For rooms and large outdoor areas, feet or meters are more practical.
How do I convert square feet to square inches? +
Multiply square feet by 144. Example: 10 sq ft × 144 = 1,440 square inches. This is useful when working with tile coverage specs that list area per tile in square inches.
How many 6×6 inch tiles do I need per square foot? +
One 6×6 inch tile covers 36 sq in = 0.25 sq ft. You need 4 tiles per square foot. For 50 sq ft: 50 × 4 = 200 tiles base + 10% waste = 220 tiles.
How do I convert inch measurements to square meters? +
Multiply length (in) × width (in) to get sq in, divide by 144 for sq ft, then multiply by 0.0929 for m². Or directly: sq in × 0.000645 = m². Example: 96 × 25 = 2,400 sq in × 0.000645 = 1.548 m².
How do I calculate how many tiles I need from inch dimensions? +
Step 1: find room area in sq in (L × W). Step 2: find tile area in sq in (tile L × tile W). Step 3: divide room sq in by tile sq in. Step 4: add 10% waste. Example: 120 in × 144 in room = 17,280 sq in; 12×12 tile = 144 sq in; 17,280 ÷ 144 = 120 tiles + 10% = 132 tiles.