Fixit Once will send a professional to take exact measurements. But when you first go out carpet shopping, you'll need a rough estimate of your room size so you can plan your budget.

With A Tape Measure, Ruler, or Yardstick:

If you have a tape measure, ruler or yardstick, measure the length and width of the room in feet.
(Remember, a yard is three feet.) The carpet calculator adds ten percent to your totals to account for closets and room irregularities. In general, it's a good idea to buy extra carpet to allow for cutting, seaming, and pattern repeats. The calculator rounds results up to the nearest whole number, as carpet is sold in units of square yards or square feet.