wikiHow Cost Savings Percentage Calculator To calculate cost savings percentage, you need to know the original cost and the cost after the savings have been applied. You can then use the following formula: Cost savings percentage = ((Original cost - Cost after savings) / Original cost) x 100% Here's an example to illustrate how this formula works: Let's say you originally paid $1,000 for a product, but you found a discount that brought the cost down to $800. To calculate the cost savings percentage, you would use the formula: ((1000 - 800) / 1000) x 100% = 20% So the cost savings percentage in this case is 20%. This means that you saved 20% of the original cost by applying the discount. Page