Customer Retention Rate Calculator

Customer retention rate measures the percentage of customers a business keeps over a defined time period. It is the inverse of churn rate, and it directly drives revenue predictability, Customer Lifetime Value (LTV), and long-term profitability. Improving retention by even a few percentage points has a disproportionate impact on company value.

Retention rate formula: Retention Rate (%) = ((Customers at End − New Customers Acquired) ÷ Customers at Start) × 100

Churn rate formula: Churn Rate (%) = 100 − Retention Rate

Or directly: Churn Rate = (Customers Lost ÷ Customers at Start) × 100

Customer Lifetime Value (LTV) formula: LTV = Average Revenue per Customer per Month × Gross Margin % ÷ Monthly Churn Rate

Where:

• Customers at Start — number of customers at the beginning of the measurement period
• Customers at End — number of customers at the end (including new ones but counting everyone)
• New Customers Acquired — customers gained during the period (subtract these to isolate retention of existing customers)
• Gross Margin % — revenue minus cost of goods/service, as a percentage

Industry benchmark retention rates:

• SaaS / subscription software: 85–95% annual
• E-commerce: 25–40% annual (lower because many customers are one-time)
• Financial services: 75–85% annual
• Telecom: 70–80% annual
• Media/streaming: 70–85% annual

Worked example: SaaS company. January 1: 500 customers. New customers acquired in Q1: 80. March 31: 530 customers.

• Customers lost: (500 + 80) − 530 = 50 customers churned
• Retention rate: ((530 − 80) ÷ 500) × 100 = (450 ÷ 500) × 100 = 90% quarterly
• Monthly retention rate: 90%^(1/3) = 96.5% per month
• Monthly churn rate: 100% − 96.5% = 3.5%

LTV (at $120/month avg revenue, 70% gross margin): LTV = $120 × 0.70 ÷ 0.035 = $2,400 per customer

Reducing churn from 3.5% to 2.5% would increase LTV to $120 × 0.70 ÷ 0.025 = $3,360 — a 40% increase in customer value from a 1% improvement in monthly retention.