Width in yards x length in yards x depth in inches x 0,0031 = volume in cubic yards (yd3) Formula for calculating compost volume in meters cubed: If you prefer cubic yards, or cubic meters, here are some other examples of formulas to use: Formula for calculating compost volume in yards cubed: Of course the same rules hold true if you’re using another unit of measurement. Let’s say you have a garden bed that measures 3 feet wide by 10 feet long and you want to spread 2 inches of compost over the top.ģ feet x 10 feet x 2 inches x 0,083 = 5 cubic feet How do I calculate how much compost I need in square yards or square meters? Width in feet x length in feet x depth in inches x 0,083 = volume in cubic feet (ft3) The magic formula for converting inches to feet is:īy integrating this factor of conversion into your calculation your results will be spot on! Formula for calculating compost volume in feet cubed: But the depth of compost is expressed in inches or centimeters.įor the calculation to be correct you need to turn inches into feet. You must multiply feet by feet, or inches by inches.īut most of us measure the size of a garden bed in feet or perhaps meters.
The tricky thing about this is you need to keep all of your measurements in the same units. Simply put, to calculate the volume you need to multiply three key measurements: The amount of compost required is the product of three things multiplied together: the width, the length and the depth. To calculate compost volumes you’ll need a rough idea of the size of the area you want to cover, and the depth of compost you need to apply.