Square Footage & Cost Calculator
By Santaji GadepatilinUpdated October 27, 2026
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calculatedType in any field to change it. Press × on a value to calculate that field instead.
How to use this calculator
Enter the length and width (in feet, metres or any unit) and the price per square foot. The area and total cost are calculated.
Example
A 12 × 15 ft room at 3.50 per ft²:
- Area = 180 ft² (16.7 m²)
- Cost = 630.00
Tip
Add 5–15% to material quantities for cutting waste, depending on the material and layout.
Frequently asked questions
How do I calculate square footage?
Multiply length by width in feet. A 12 × 15 ft room is 180 ft².
How do I handle irregular rooms?
Split the space into rectangles, calculate each one, and add them up.
How do I convert square feet to square metres?
Multiply by 0.0929. Switch the Area unit to m² to see it directly.