Square Footage Calculator is a free browser tool for homeowners and DIY users who need to measure rooms and plan flooring purchases. No account is required.
Measure the floor area
Enter dimensions in feet and inches, decimal feet, inches, meters or centimeters. Choose a rectangle, L-shaped room, circle or triangle. Add or subtract rectangular sections to account for an alcove, closet or excluded area, and combine up to 20 rooms.
Turn area into a purchase estimate
The flooring calculator keeps net measured area separate from the chosen waste allowance. It rounds up to whole boxes using product coverage, with spare boxes and optional costs shown separately. For example, a 100 sq ft floor with a 10% allowance needs 110 sq ft before box rounding; if each box covers 23 sq ft, five boxes provide 115 sq ft. This makes the box-rounding surplus visible instead of hiding it in one total.
Keep a copy of your work
Copy or print results before refreshing; measurements stay in the current browser tab and are not saved as a cloud project.
Practical limits
Use the calculations as planning estimates. Recheck dimensions and packaging coverage, and follow the flooring manufacturer's instructions. Layout patterns, site conditions, cutting requirements and product-specific waste rules can change the appropriate allowance. The tool does not optimize carpet roll cuts or provide certified property measurements.
