Enter Measurements
Choose one calculation mode. Linear inches need another dimension.
Formula Used
Square feet equals square inches divided by 144. Dimensions must use matching linear units. Waste is added after the base calculation.
Square feet = Square inches ÷ 144 Square inches = Length in inches × Width in inches Final area = Base area × (1 + Waste percentage ÷ 100) Estimated cost = Final square feet × Price per square foot
How to Use
Select the suitable calculation mode first. Enter valid measurements and choose each unit. Then review the result above the form.
- Choose dimensions, square, direct area, or multiple sections.
- Enter measurements using decimals, fractions, or mixed values.
- Add quantity, waste, coverage, and pricing details.
- Select the required decimal precision.
- Press Calculate area and review every result.
Example Data
| Example | Input | Calculation | Result |
|---|---|---|---|
| Direct conversion | 1,440 sq in | 1,440 ÷ 144 | 10 sq ft |
| Rectangle | 48 in × 36 in | 1,728 ÷ 144 | 12 sq ft |
| Square | 24 in × 24 in | 576 ÷ 144 | 4 sq ft |
| Mixed units | 6 ft × 30 in | 72 × 30 ÷ 144 | 15 sq ft |
Conversion Reference
| Area | Equivalent square feet |
|---|---|
| 144 square inches | 1 square foot |
| 1,296 square inches | 9 square feet |
| 1 square yard | 9 square feet |
| 1 square metre | 10.7639 square feet |
Frequently Asked Questions
Can inches convert directly into square feet?
No, linear inches need a second dimension. Multiply length by width first. Then convert the resulting square inches.
How many square inches equal one square foot?
One square foot contains 144 square inches. This comes from twelve inches squared. Divide square inches by 144.
Can I use feet and inches together?
Yes, choose the feet and inches unit. Enter values like 5' 8". The calculator converts them automatically.
Does the calculator accept fractions?
Yes, enter values like 12 1/2. Simple fractions also work correctly. Invalid fractions produce a clear warning.
How does waste allowance work?
Waste is calculated from the base area. It is added to the total. This supports cutting and fitting losses.
Can I combine several rooms?
Yes, select the multiple sections mode. Add each room or surface separately. The calculator totals valid sections.
Can I estimate flooring packages?
Yes, enter coverage and package quantity. The calculator rounds purchases upward. This helps prevent material shortages.
Which pricing methods are available?
Use price per square foot or package. British pounds are shown by default. Enter current supplier prices manually.
Why are results rounded?
Rounding makes results easier to read. Select up to eight decimal places. Purchase quantities always round upward.
Can I export the calculation?
Yes, copy, CSV, PDF, print, and text options exist. Exports use the current result. Review values before sharing.
What projects can use this calculator?
Use it for flooring, tiles, drywall, roofing, paint, and wallpaper. It also suits panels and sheet materials. Always verify field measurements.
Calculation History
Recent browser calculations appear below. History stays on this device. Clear it whenever required.