Calculate the full suite of SaaS metrics investors and operators care about. Enter your ARR, churn, customer count, and spend to get NRR, GRR, LTV:CAC ratio, Rule of 40 score, and Magic Number with benchmark comparisons.
Inputs
Current annualised recurring revenue.
New ARR added from new customers in the trailing twelve months.
ARR lost from churned customers in the trailing twelve months.
Total number of active customers.
Total revenue including recurring and non-recurring over the trailing twelve months.
Total sales and marketing spend over the trailing twelve months.
Total COGS including hosting, support, and customer success costs.
Results
Net Revenue Retention
133.3%
How to use
Enter your current ARR and new ARR added over the trailing twelve months.
Enter the ARR lost to churn in the same period.
Add your total customer count and total revenue (including non-recurring).
Enter your sales & marketing spend and COGS.
Review the full metrics dashboard with benchmark comparisons.
Worked Example
A Series B SaaS company has $10M ARR, added $3M new ARR, lost $500K to churn, has 200 customers, $12M total revenue, $4M S&M spend, and $2.5M COGS.
Gross Margin
($12M - $2.5M) / $12M = 79.2%
GRR
($10M - $500K) / $10M = 95.0% (Good: above 90%)
ARR Growth Rate
($3M - $500K) / $10M = 25.0%
CAC
$4M / (200 x 0.30 assumed new) = ~$66,667 per new customer
Magic Number
$2.5M net new ARR / $4M S&M = 0.63
Key Takeaway
The 95% GRR is solid, but the Magic Number at 0.63 suggests sales efficiency could improve. The Rule of 40 score depends on combining growth with profitability.
Guidance
These metrics form the standard SaaS operating dashboard used by operators and investors. NRR above 110% shows strong expansion; GRR above 90% shows good retention. LTV:CAC above 3:1 means the unit economics work. The Rule of 40 combines growth and profitability — early-stage companies can score well on growth alone, while mature companies need profit margin to contribute. The Magic Number measures how efficiently S&M spend converts to new ARR. Each metric has benchmark ranges: look at the colour coding (green for best-in-class, neutral for acceptable, red for needs attention).
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