Customer Satisfaction Score (CSAT) is the measure of how satisfied your customers are on average.
There is a bit of creativity involved in this part. However, it should include some questions about how satisfied you are with the product/service you received with a rating of 1-10.
Your CSAT score ranges from 0-100. Then, the calculation for your CSAT score would be:
(Number of satisfied customers / Total number of responses) * 100 = CSAT