One of the most critical revenue KPIs for many companies, sales growth shows how much your business is growing. This can be expressed as a percentage change from one period to another or it could also show you if there has been contraction in terms of net sales compared with before (or during) this time last year/quarter . A positive number means things are getting better; negative values mean they're less so than before. The formula is: Sales growth rate = (Current net sales – Prior period net sales) / Prior period net sales x 100