Free Retention Rate Calculator
Calculate customer retention rate, churn rate, and customers lost from any period with a simple retention calculator built for SaaS teams.
Customer Retention Rate
= (Customers at End − New Customers) ÷ Customers at Start × 100
Churn Rate
14.0%
Customers Lost
70
Retained
430
How interactive demos improve retention
- 81% onboarding demos are the highest-impact use case for retention
- Send saw 50% faster user comprehension with interactive demos vs. static docs
Trusted by 200,000+ top operators and 3,000+ paying organizations
How to calculate customer retention rate
1. Enter period start and end customers
Add your customer count at the start of the period and the total customer count at the end of the same period.
2. Add new customers acquired
Enter how many new customers you acquired during the period so the formula can exclude them from the retention calculation.
3. Review retention and churn
See your retention rate, churn rate, and exact number of customers retained or lost during the period.
Why use our retention rate calculator
Accurate retention formula
Accurate retention formula
Calculate retention by isolating existing customers, not total end-of-period count, so new acquisitions do not skew your results.
Churn rate included
Churn rate included
See churn rate automatically alongside retention so you have both sides of the story in one place.
Customers lost count
Customers lost count
Understand the absolute number of customers who left alongside the percentage to put the rate in real business context.
Why we built Supademo's retention rate calculator
“Retention starts before someone pays. beehiiv lifted free-to-paid conversions 50% after putting an interactive demo on the page, and free-to-paid is the first retention event a SaaS team has. If you can't keep them at $0, you won't keep them at $99.”
“Per our 2026 demos report, teams covering more customer journey stages with demos report 91% high impact at five stages versus 70% at one. Activation is the cheapest retention work you can do.”
Who uses Supademo's retention rate calculator?
Sell into accounts with high retention risk
Understand retention by segment to focus expansion and renewal conversations on accounts most likely to stay and grow.
Explore sales enablement
How do sales teams use a retention rate calculator?
Sales teams use retention calculators to understand which customer segments stay longer and focus their upsell efforts accordingly.
How do marketing teams use retention data?
Marketing teams use retention rates to evaluate which acquisition channels and messages attract customers who are likely to stay.
How does customer success use a retention rate calculator?
Customer success teams use retention rate calculators to track the impact of their programs and identify where customers are most likely to churn.
How do support teams affect retention?
Support teams use retention data to understand which ticket types and unresolved issues are most likely to lead to churn.
How do product teams use retention rate?
Product teams use retention rates by cohort to identify which features and onboarding flows have the strongest impact on keeping customers.
How do training teams use retention data?
Training teams use retention rates to evaluate whether their onboarding and training programs are making customers more likely to stay.
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Frequently asked questions
Common questions about customer retention rate, churn, and improving retention with interactive demos.
What is customer retention rate?
Customer retention rate measures the percentage of customers you kept over a period, relative to the number you had at the start, excluding any new customers acquired during that time. It is the inverse of churn: a 95% retention rate means a 5% churn rate.
Retention rate is a leading indicator of revenue health. A one-point improvement compounds significantly over 12 months because it not only preserves existing ARR but also improves LTV, NRR, and the efficiency of all acquisition spend.
How do you calculate retention rate?
Subtract the number of new customers acquired during the period from the number of customers at the end of the period, divide by the number of customers at the start, and multiply by 100. This isolates retention from acquisition so new customers do not inflate the metric.
The formula ensures you are measuring how well you held existing customers, not how fast you grew. The two can move in opposite directions and mask each other without this separation.
What is the difference between retention rate and churn rate?
Retention rate and churn rate are complements that add up to 100%: a 93% retention rate equals a 7% churn rate. Most teams report monthly churn (smaller numbers, easier to discuss) but make strategic decisions based on annual retention (more impactful on LTV and investor benchmarks).
Tracking both on the same time basis avoids confusion when comparing against industry benchmarks, which are often stated as annual retention but sometimes quoted as monthly churn.
Why do I need to subtract new customers?
New customers acquired during the period were not present at the start, so including them in the end-of-period count would make retention look artificially higher than it is. The formula isolates whether you kept the customers you started with, which is the specific question retention rate is designed to answer.
A company that loses 10% of its base but acquires 30% more will have a large net headcount gain but a poor retention rate. Both numbers matter and they should be reported separately.
What is a good retention rate for SaaS?
For B2B SaaS, monthly retention rates of 95%+ (5% monthly churn or less) are generally considered healthy. Annual retention above 85% is a reasonable benchmark for SMB-focused products; enterprise-focused products often sustain 90–95%+ annual retention due to higher switching costs and longer contracts.
But the more meaningful benchmark is your own trend: declining retention quarter over quarter is a warning sign worth investigating before it compounds, even if the absolute rate looks acceptable.
What causes low retention rates?
Research consistently shows that the biggest churn drivers in SaaS are poor onboarding (customers who never fully activated), unmet expectations set during sales, and inattention from customer success as accounts approach renewal. Customers who activate the product's core features in their first 30 days churn at dramatically lower rates.
Our deep-dive on how to calculate and reduce churn rate covers the diagnostic moves that move retention fastest. Explore how Supademo improves activation at customer success use cases.
What is the difference between retention rate and NRR?
Retention rate counts customers (logos), while NRR counts revenue. A business with 80% logo retention but strong expansion revenue from remaining accounts might post 110% NRR, meaning it grew revenue even while losing customers. Both metrics matter: logo retention tells you about the breadth of your customer base; NRR tells you about the depth of value your best customers are getting. Track both to get the full picture of retention health.
How can interactive demos improve retention rate?
Interactive demos reduce the knowledge gap that causes customers to stop using products they paid for. When customers can explore new features, integrations, and workflows at their own pace without scheduling another training call, they activate more deeply and stay longer. 81% of Supademo customers cite onboarding demos as their highest-impact use case, with measurable effects on activation and early retention.
Send replaced static documentation with interactive demos and saw 50% faster user comprehension, which directly reduces the confusion that triggers silent churn.
Is this retention rate calculator free?
Yes. Supademo's retention rate calculator is completely free to use in your browser with no sign-up required.