Customer Effort Score (CES): What It Is, How to Measure It & How to Improve It

Customers rarely remember the survey you sent them, but they remember how hard you made them work. Customer Effort Score (CES) measures exactly that: how much effort it took someone to get their issue resolved or their question answered. It is one of the strongest predictors of loyalty, and for email-based teams it is closely tied to one thing you can control - how fast and how completely you reply. This guide covers what CES is, how to measure it, what a good score looks like, and how to improve it.

What is Customer Effort Score?

Customer Effort Score is a customer experience metric that captures how much work a customer had to do to reach a resolution. The idea, popularized by the Harvard Business Review article "Stop Trying to Delight Your Customers," is simple: reducing effort builds loyalty more reliably than trying to exceed expectations. A customer who got a fast, clear answer on the first try is far more likely to stay than one who had to chase, repeat themselves, or wait.

Unlike satisfaction, which is broad, CES is narrow and actionable. It points directly at friction - the slow reply, the third follow-up, the answer that did not actually solve the problem.

How do you measure Customer Effort Score?

CES is measured with a single survey question sent shortly after an interaction, while it is fresh. The most common version is a statement the customer rates on a 1-to-7 scale from "strongly disagree" to "strongly agree":

"[Company] made it easy for me to handle my issue."

To calculate your score, average the numeric responses:

CES = sum of all scores ÷ number of responses

If 100 customers respond and their scores add up to 580, your CES is 5.8 out of 7. Some teams instead report the percentage of customers who chose the top two "agree" options - both approaches work as long as you stay consistent. Send the survey right after the resolution, keep it to one question, and you will get a clean, comparable number over time.

CES vs CSAT vs NPS

CES is one of three core experience metrics, and each answers a different question:

• CES (Customer Effort Score) - how easy was this specific interaction? Best for measuring friction in support and service.
• CSAT (Customer Satisfaction) - how happy was the customer with this interaction? Broad and immediate.
• NPS (Net Promoter Score) - how likely is the customer to recommend you overall? A relationship-level, long-term signal.

They work best together: CES finds the friction, CSAT confirms how it felt, and NPS tells you the long-term effect. For a deeper comparison of the other two, see our guide on CSAT vs NPS.

What is a good Customer Effort Score?

On the 1-to-7 scale, a CES above 5 is generally considered good, and above 6 is excellent - it means most customers agreed it was easy to deal with you. Below 4 signals real friction worth investigating. That said, the absolute number matters less than the trend: what you want to see is your CES moving up over time, and to know which interactions drag it down. A single low score on a complex case is normal; a pattern of low scores on slow email threads is a problem you can fix.

How to improve your Customer Effort Score

Because CES measures friction, improving it means removing the things that make customers work harder. The most common sources of effort in email support are:

• Slow first responses - the longer someone waits, the more effort the whole interaction feels like.
• Repeated follow-ups - every time a customer has to chase or re-explain, effort climbs.
• Bouncing between people - being passed around or re-routed is high-effort by definition.
• Unclear or incomplete answers - a reply that does not fully resolve the issue forces another round.

Notice that three of those four are about email responsiveness - how fast you reply and whether you resolve it in one go. That is the part you can measure and manage directly. A tool like Email Meter connects to your Google Workspace or Microsoft 365 and shows your real response times, how many threads needed multiple exchanges, SLA compliance, and which conversations went unanswered. Bringing those numbers down is one of the most reliable ways to bring your effort score up - the survey tells you effort is high, and the email data tells you where it is coming from.

Frequently asked questions

What is Customer Effort Score (CES)?

Customer Effort Score is a metric that measures how easy it was for a customer to get their issue resolved or their question answered. It is collected with a single survey question after an interaction and is a strong predictor of loyalty, since lower effort tends to keep customers longer.

How is CES calculated?

Ask customers to rate a statement like "[Company] made it easy for me to handle my issue" on a 1-to-7 scale, then average the responses: CES equals the sum of all scores divided by the number of responses. Some teams instead report the percentage of customers who selected the top "agree" options.

What is a good Customer Effort Score?

On a 1-to-7 scale, a score above 5 is good and above 6 is excellent, while below 4 signals friction worth investigating. The trend over time matters more than the absolute number - you want CES rising and you want to know which interactions pull it down.

What is the difference between CES and CSAT?

CES measures how easy a specific interaction was, focusing on effort and friction. CSAT measures how satisfied the customer was overall with the interaction. CES is more actionable for fixing support friction, while CSAT is a broader happiness signal.

How can I improve my Customer Effort Score?

Remove the friction that makes customers work: reply faster, resolve issues in fewer exchanges, and avoid bouncing people between agents. For email teams, the biggest lever is response time and first-contact resolution, which you can track and improve with a tool like Email Meter.