Enter room dimensions in millimeters - automatic conversion to feet and inches
Converts room measurements and works out area and volume without the arithmetic or the unit conversions. It runs in a phone browser, so it is usable standing in the room being measured rather than back at a desk.
Multiply length by width for a rectangular room. For an irregular room, split it into rectangles, calculate each and add them together.
Divide square feet by 10.764. The calculator does this and the reverse, which avoids the mistake of converting length and then squaring.