What is CSAT (Customer Satisfaction Score)?

CSAT (customer satisfaction score) is a survey measure of how satisfied customers are with a specific product, interaction or experience, usually reported as the percentage of respondents who answer 4 or 5 on a 5-point scale.

At a glance

• CSAT meaning: customer satisfaction score. It answers “how did we do this time?”
• Formula: CSAT (%) = satisfied responses (4s and 5s) ÷ total responses × 100. IBM, Qualtrics and Gainsight all describe it this way.
• It’s usually sent right after a moment: a support ticket closing, onboarding finishing, a delivery, a renewal call.
• It’s a short-term, transactional measure. NPS is the longer-term loyalty measure.
• Scores differ a lot by industry and by question wording, so compare with your own history first.

How to calculate a CSAT score

Ask one clear question tied to one moment, such as “How satisfied were you with the help you got today?”, with answers from 1 (very unsatisfied) to 5 (very satisfied). Count the 4s and 5s, divide by all responses, and multiply by 100. Some teams use a 1 to 10 or emoji scale; the idea is the same, but keep one scale so trends mean something.

Example (illustrative): your support team closes 400 tickets in a month and 160 customers answer the survey. 128 choose 4 or 5. CSAT is 128 ÷ 160, or 80%. Report the 160 responses next to it, and read the comments from the 32 who weren’t satisfied, because that’s where the fixes are.

Why CSAT can mislead

CSAT tells you how one moment went, and the moment has already passed by the time you read it. That’s why we’ve argued on the blog that CSAT is a lagging metric and needs leading signals next to it. A customer can rate every support ticket highly and still leave at renewal, because the product never got adopted across their team.

Response bias is the other issue. Very happy and very unhappy customers answer more often than the middle, and accounts that have gone quiet often don’t answer at all.

Common CSAT mistakes

• Surveying too late. Ask within hours of the interaction, while the customer remembers it.
• Vague questions. “How satisfied are you with us?” mixes the product, the price and the last call into one number.
• Treating it as a retention forecast. Pair it with usage, renewals and churn rate.
• No follow-up on low scores. A low score with no reply tells the customer the survey was for show.
• Tying agent pay to it alone. It invites gaming, like asking only easy tickets to rate.

How CSAT shows up in a revenue system

CSAT is one input to a customer health score, alongside effort, usage and onboarding progress. At AtoB, we run the customer-facing side alongside sales, covering support, collections, onboarding and QA. Read how the AtoB customer team runs.

Terms that sit next to CSAT

CES asks how easy something was, which catches friction a satisfaction score can miss. Together, CSAT, CES and NPS give a fuller picture than any one of them.