Do you find it difficult when looking at a mulch bed to know how mulch mulch you will need to cover the area? Trying to figure out the math for it can be very difficult. Well stop worrying about buying too much mulch / topsoil or not enough and have to go back to the supply store to get more. Use this handy topsoil and mulch calculator. Itís based on the same online version we have but it includes extended capabilities, like adding the mulch mark up %. It can also add your labor rates to give you a quick and easy answer as to how much topsoil / mulch you will need and how much you should charge the customer for the job.