Square Inches to Square Feet Calculator converts in² to ft² instantly — simple, fast, and accurate.
It applies the ÷144 rule automatically, giving precise square footage for any value or dimensions.
How to Convert Square Inches to Square Feet (Formula)
Formula: ft² = in² ÷ 144
- Example 1: 100 in² ÷ 144 = 0.694 ft²
- Example 2: 6×9 in = 54 in² → 54 ÷ 144 = 0.375 ft²
💡 Tip: Multiply length × width to get square inches first — then divide by 144 for square feet.
Quick Conversion Table
Fast reference to convert square inches (in²) to square feet (ft²) — perfect for flooring, printing, and DIY measurements.
| Square Inches (in²) | Square Feet (ft²) | Example Use |
|---|---|---|
| 12×12 = 144 | 1 | 1 ft² = 12 in × 12 in |
| 100 | 0.694 | Small tile surface |
| 225 | 1.56 | 15×15 inches |
| 400 | 2.78 | Small board |
| 576 | 4 | 24×24 inches |
| 1000 | 6.94 | Medium object |
| 5609 | 38.96 | Example from Google |
| 10000 | 69.44 | Larger layout |
Tip: To convert any value manually, multiply dimensions to get in² first, then divide by 144 to get ft².
Why Divide by 144?
Each foot equals 12 inches. Since we’re dealing with area (2D), we multiply the conversion on both sides:
12 × 12 = 144.
That’s why whenever you convert from square inches (in²) to square feet (ft²), you always divide by 144.
Reverse Conversion (Square Feet to Square Inches)
To reverse the process and convert from square feet (ft²) back to square inches (in²), simply multiply by 144.
Formula: in² = ft² × 144
Example: 3 ft² × 144 = 432 in²
Real-Life Examples – Where to Use the Square Inches to Square Feet Calculator
The Square Inches to Square Feet Calculator isn’t just for math — it’s a practical tool used every day in construction, interior design, and DIY measurements.
Here are common real-world applications where quick and accurate conversions save time and money:
- Flooring & Tiling: Easily convert tile or plank dimensions from inches to square feet to estimate total floor coverage.
- Printing & Paper Layout: Calculate paper surface area to match design and print size requirements precisely.
- DIY & Craft Projects: Measure fabric, wood panels, or any materials in inch² and instantly get their equivalent ft².
- Construction Planning: When working with blueprints or room layouts, convert small-scale inch values to square footage for accurate area estimation.
💡 Tip: Always use consistent units — and remember that 1 ft² = 144 in² when converting areas for flooring, tiling, or printing.
Difference Between Square Inches and Square Feet
A square inch (in²) measures a 1×1 inch area — often used for small objects or print layouts.
A square foot (ft²) measures a 12×12 inch area — ideal for flooring, construction, or real estate.
In other words, 1 ft² = 144 in², meaning square feet cover much larger surfaces.
💡 Tip: Use square inches for fine measurements and square feet for total surface coverage.
Conversion Chart for Common Dimensions (Inches → Feet)
Entering L × W in inches? Use this chart to see the equivalent area in square inches and square feet at a glance.
| Dimensions (in) | Area (in²) | Square Feet (ft²) |
|---|---|---|
| 6 × 9 | 54 | 0.375 |
| 8 × 10 | 80 | 0.556 |
| 10 × 10 | 100 | 0.694 |
| 12 × 12 | 144 | 1 |
| 12 × 24 | 288 | 2 |
| 15 × 15 | 225 | 1.56 |
| 18 × 18 | 324 | 2.25 |
| 20 × 20 | 400 | 2.78 |
| 24 × 36 | 864 | 6 |
| 48 × 96 | 4,608 | 32 |
Tip: Area (in²) = L × W, then ft² = in² ÷ 144. This chart targets real searches like “12×12 inches in square feet” and “6×9 inches to square feet”.
FAQs – Square Inches to Square Feet
1) How do you convert square inches to square feet?
Use the formula ft² = in² ÷ 144. Example: 100 in² ÷ 144 = 0.694 ft².
2) Why divide by 144 for square footage?
Because 1 ft = 12 in, and area is two-dimensional: 12 × 12 = 144. So you divide in² by 144 to get ft².
3) What is 12×12 inches in square feet?
12 × 12 = 144 in² → 144 ÷ 144 = 1 ft².
4) How many square feet is 20×20 inches?
20 × 20 = 400 in² → 400 ÷ 144 = 2.78 ft² (approx).
5) How to convert back to square inches?
Use the reverse formula: in² = ft² × 144. Example: 3 ft² × 144 = 432 in².
6) Can I use decimals or fractions?
Yes. Enter decimal or fractional dimensions (e.g., 8.5 × 11 or 1/2 × 3/4). Compute in² = L × W, then divide by 144.
7) What’s the difference between inch² and linear inches?
Linear inches measure length only. Square inches (in²) measure area (length × width). Don’t confuse them when converting to square feet.
Quick Tips
- Always divide inch² by 144 to get ft².
- For rectangles, multiply length × width (in inches) first before converting.
- Avoid confusing square inches with linear inches — one measures area, the other length.
- Double-check large or irregular values using the reverse formula (in² = ft² × 144).
Related Tools + Final Note
Explore more free converters and calculators for precise measurements and instant conversions:
- square root calculator → quickly finds √x, ³√x, and any nth root.
- Inches to Feet Converter → for quick linear conversions.
- Area Calculator → handle multiple units and shapes.
- Rectangle Area Calculator → compute area using width × height.
🔗 More on area conversions — Wikipedia.