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In the world of Software as a Service (SaaS), understanding key performance indicators (KPIs) is crucial to the success and growth of any business. One such KPI that plays a significant role in the growth of a SaaS business is the Customer Expansion Rate (CER). This metric is a measure of how much your existing customers are expanding their use of your product or service over a given period.

As a B2B SaaS company, it’s important to track and understand your CER because it provides insight into how well you’re upselling and cross-selling to your existing customers. In other words, it’s a measure of how much additional revenue you’re generating from your existing customer base. This article will provide an in-depth explanation of the Customer Expansion Rate, its importance, how to calculate it, and strategies to improve it.

Understanding the Customer Expansion Rate (CER)

The Customer Expansion Rate (CER) is a key performance indicator (KPI) that measures the growth in revenue from existing customers. It is calculated by comparing the revenue at the beginning of a period to the revenue at the end of the period, excluding any new customers acquired during that period.

Essentially, CER shows how much your existing customers are expanding their use of your product or service. This could be through purchasing additional features, upgrading their subscription, or buying more licenses. It’s a powerful indicator of customer satisfaction and product value, as customers are unlikely to spend more on a product or service they’re not satisfied with.

Importance of CER

Tracking CER is crucial for SaaS companies for several reasons. Firstly, it’s a clear indicator of customer satisfaction. If your customers are spending more on your product or service, it’s a good sign they’re finding value in it. This can help you identify what’s working well and where you can improve.

Secondly, CER can be a more cost-effective growth strategy than acquiring new customers. It’s generally cheaper to upsell or cross-sell to existing customers than it is to acquire new ones. Therefore, a high CER can indicate a more efficient use of resources.

Calculating CER

To calculate CER, you need to know your revenue at the beginning and end of a period, as well as any new revenue from new customers. The formula is: (End Period Revenue – Start Period Revenue – New Customer Revenue) / Start Period Revenue * 100.

This will give you a percentage that represents your CER. A positive percentage indicates growth, while a negative percentage indicates a decrease in revenue from existing customers.

Strategies to Improve CER

Improving your CER involves strategies aimed at increasing the value your existing customers get from your product or service. This can involve upselling, cross-selling, improving customer satisfaction, and reducing churn.

It’s important to note that improving CER is not just about selling more, but about providing more value. If customers see the value in what you’re offering, they’re more likely to spend more.

Upselling and Cross-Selling

Upselling involves encouraging customers to purchase a higher-priced version of your product or service, while cross-selling involves selling additional products or services to existing customers. Both strategies can increase your CER by increasing the revenue you generate from each customer.

However, it’s important to approach these strategies with the customer’s needs in mind. Offering products or services that don’t add value to the customer can harm your relationship and potentially lead to churn.

Improving Customer Satisfaction

Customer satisfaction is a key driver of CER. If customers are satisfied with your product or service, they’re more likely to continue using it and potentially spend more. Therefore, improving customer satisfaction can lead to a higher CER.

Improving customer satisfaction can involve improving your product or service, providing excellent customer service, and regularly seeking feedback from customers. It’s important to listen to your customers and make changes based on their feedback.

Monitoring and Analyzing CER

Monitoring and analyzing your CER is crucial to understanding how your business is performing and where you can improve. By regularly tracking this metric, you can identify trends, spot issues early, and make informed decisions about your growth strategies.

However, it’s important to remember that CER is just one metric. While it’s a powerful indicator of growth, it should be considered alongside other metrics such as churn rate, customer acquisition cost (CAC), and lifetime value (LTV).

Using CER in Conjunction with Other Metrics

While CER is a valuable metric, it should not be used in isolation. It’s important to consider CER alongside other metrics to get a complete picture of your business’s performance.

For example, if your CER is high but your churn rate is also high, it could indicate that while you’re good at upselling and cross-selling, you’re losing customers at a high rate. This could be a sign that you need to focus on improving customer satisfaction or reducing churn.

Tools for Tracking CER

There are several tools available that can help you track and analyze your CER. These tools can automate the calculation process and provide visualizations that make it easy to understand your data.

Some popular tools include SaaS metrics dashboards like ChartMogul, Baremetrics, and SaaSoptics. These tools integrate with your existing systems to automatically calculate and track your CER, along with other important SaaS metrics.


The Customer Expansion Rate (CER) is a powerful KPI that can provide valuable insights into the growth of your SaaS business. By understanding and tracking this metric, you can identify opportunities for growth, improve customer satisfaction, and make informed decisions about your business strategy.

Remember, improving your CER is not just about selling more, but about providing more value to your customers. By focusing on customer satisfaction and value, you can increase your CER and drive sustainable growth for your business.

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