This concrete calculator also calculates cubic meters. Just enter in your dimensions make sure you choose feet and inches carefully then hit calculate. Mark the area that will need concrete and divide it into smaller areas.
A good rule of thumb is take your calculation and add 4 to 10 to the total to account for waste spillage over-excavation settlement spreading of forms loss of entrained air or any other changes in volume.
The best way to calculate how much concrete youre going to need in cubic yards is to do the following. HOW TO CALCULATE WATER CEMENT RATIO. Enter your length width and thickness then hit calculate and youll see how many cubic yards you need. For example with measurements of 20 25 20 30 and 20 feet the average would by 2025203020 5 or 23 feet.