Fire wood is measured in cords. The cord is a unit of volume equal to 128 cubic feet (4 feet high, 4 wide and 8 feet long). If you are on the metric system, or need to do a conversion, you can make your measures in meters, then convert it as necessary to cords and back. There are approximately 35.3 cubic feet in a cubic meter, so use that as your conversion factor.
Measure your fire wood in meters, if you have a metric tape. Multiply the height of the pile by the length and width to calculate the volume. A pile 1 meter high, 2 meters wide and 3 meters long is 6 cubic meters.
Convert cubic meters to cords, using cubic feet. Here, 6 cubic meters, multiplied by 35.3 yields the volume in cubic feet, 211.8. Divide that by 128, the cubic feet in a cord, to get the equivalent volume in cords; here, it's 1.65.
Measure your wood pile in feet if you have an English system measuring tape and calculate the volume per Step 1. If the pile is 14 feet long, 3 feet high and 6 feet wide, that equals 252 cubic feet. Convert that to cubic meters, dividing it by 35.3. In this case, it equals 7.14 cubic meters.