This series of concrete calculators has been developed to help you plan your project. You can calculate how much concrete, cement, sand, mortar or render you will need. For each calculation you will have to know the dimensions of your object. The calculator will perform the sums for you - where relevant it will add a small percentage for the wastage that inevitably happens when mixing & using cement-based products, and then it will round the result up to the nearest whole 20kg bag.
This way, you will know exactly how many bags of cement you will need for your project, whether you’re rendering a wall, setting a post or paving your driveway.
Please note: When planning your project, you may need to seek specialist advice. For example, how deep should you dig your holes for setting posts? There is no simple answer as there are so many factors that can affect the depth the hole needs to be; the soil type and the planned load on the post are just two factors. Please make sure to ask a specialist if you are unsure.