# How much good stuff you need

### Wonder how much good stuff you need?

Volume

To find how much you need, first calculate the surface area of your project (e.g. basket, bed, garden, lawn). To obtain this, multiply the length by the width. This will often be sufficient, for instance to determine how much amendment you need when top-dressing.

If you are filling a new volume, you will need to multiply your project's surface area by it's depth. Or simply put, multiply the length by the width by the depth.

When amending by volume to incorporate in depth, you will need to multiply your project's volume by the recommended proportion. For instance biochar amendment is typically recommended at 5-10% v/v. In other words, multiply the length by the width by the depth by the proportion.

Remember to keep all measurements in the same unit. For instance if your bed is only 6 inches, use 0.5 feet! Helpful tips: there are 27 cubic feet in a cubic yard, and 1000 litres in a cubic meter. And 1 cubic yard = 0.76 cubic meter.
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