How to use this calculator
- Choose US customary or metric measurements.
- Measure the length and width of the first rectangular area.
- In US mode, add inches when a measurement is not an even foot.
- Add more areas and calculate the combined total.
How the calculation works
Each rectangular area is length multiplied by width. The calculator then adds every area and converts the combined result between square feet and square meters.
Formula
Area = length × width Total area = area 1 + area 2 + … Square meters = square feet × 0.09290304
Worked example
A 12 ft × 15 ft room contains 180 square feet, which is approximately 16.72 square meters.
Project considerations
- Break L-shaped or irregular spaces into non-overlapping rectangles.
- Measure at consistent boundaries.
- Material orders may require a separate cutting or waste allowance.
Frequently asked questions
How do I measure an irregular room?
Divide it into rectangles, enter each rectangle as a separate area, and avoid overlapping the sections.
Does this include material waste?
No. The result is geometric area only, so apply the waste guidance for your specific material separately.