SaaS Metrics Calculator
Enter your MRR, customers, and growth metrics to instantly calculate ARR, ARPU, NRR, LTV:CAC ratio, and runway. See your health status with expert benchmarks.
Your SaaS metrics
Fill in your monthly recurring revenue, customer metrics, and operating costs. All calculations update in real-time.
Predictable monthly revenue
Current active customers
Brand new customers acquired
Customers lost
Revenue from existing customers
Revenue lost to downgrades
Cost to acquire one customer
Total monthly burn
Total cash in bank - used to calculate months of runway
Revenue Metrics
Customer Health
Runway & Burn
Healthy growth. NRR 102% + LTV:CAC 6.25:1 shows good fundamentals. You have breathing room. Continue optimizing retention, and consider scaling customer acquisition.
- Increase NRR: Focus on expansion - upsells, cross-sells, and seat expansion. Every $1K in expansion revenue on your current base improves NRR.
- Lower churn: Improve product quality, onboarding, and customer support. A 1% reduction in churn can add 1–3 months of LTV.
- Improve LTV:CAC: Increase prices, reduce CAC through referral/organic channels, or improve retention. A 3:1 ratio is minimum; aim for 5:1+.
- Extend runway: Every $1K/month reduction in burn adds ~6 weeks of runway. Or grow MRR 10% to reduce burn pressure.
I specialize in early-stage SaaS growth. Book a free call to discuss your metrics, growth strategy, and next steps.
SaaS Metrics That Matter: A Founder's Guide
Every SaaS founder needs to know their key metrics. Not to impress investors (though it helps), but to understand whether your business is actually working. Are customers staying? Is your acquisition cost sustainable? Do you have enough runway to hit the next milestone?
The metrics in this calculator are what serious SaaS operators live by. MRR tells you current revenue. NRR tells you growth from existing customers. LTV:CAC tells you if your unit economics work. CAC payback period tells you if you can afford to keep acquiring customers. Together, they paint a complete picture of SaaS health.
The Core Four: MRR, ARR, NRR, and CAC
MRR (Monthly Recurring Revenue) is your monthly income from subscriptions. It's the single most important number to track. If MRR isn't growing, nothing else matters. ARR (Annual Recurring Revenue) is MRR times 12 - this is what investors use to value your company and benchmark your stage.
NRR (Net Revenue Retention) is the percentage of revenue retained from existing customers, including expansion and churn. An NRR above 100% means customers are expanding faster than they're leaving - this is the sign of true product-market fit. CAC (Customer Acquisition Cost) is how much you spend to acquire one customer. High CAC with short customer lifespans is a death spiral.
Why LTV:CAC Ratio Predicts Success
The ratio of customer lifetime value to acquisition cost is the ultimate SaaS health metric. A 3:1 ratio means for every $1 you spend acquiring a customer, they generate $3 in lifetime value. Below 2:1 and your unit economics don't work - you can't grow profitably. Above 5:1 and you have a mode-scaling business. This ratio directly determines if you can raise money, when you can become profitable, and how fast you can grow.
The Two Levers: Lower CAC, Increase LTV
To improve LTV:CAC, you have two levers: (1) Lower your CAC - move from paid marketing to referrals and organic, improve sales efficiency, negotiate better vendor terms. (2) Increase LTV - improve retention (lower churn), increase ARPU through higher pricing or expansion revenue, extend customer lifecycle. Most founders focus on CAC; the best ones focus equally on both.
Runway: The Other Critical Metric
Runway is how many months of operating expenses your cash covers. 18–24 months is healthy; below 6 months is emergency mode. But runway isn't just about time - it's leverage. Starting a fundraise at 12 months of runway gives you negotiating power. Starting at 3 months and investors know they can lowball you on valuation because you're desperate. Every founder should know their runway before every board meeting.
Frequently Asked Questions
What is Net Revenue Retention (NRR)?+
Net Revenue Retention (NRR) measures the percentage of revenue retained from existing customers after accounting for churn, downgrades, and expansion. NRR = (MRR + expansion revenue − churn revenue − downgrade revenue) / starting MRR × 100%. An NRR above 100% means you're growing revenue from your existing customer base (expansion outpaces churn). 120%+ NRR is excellent and indicates strong product-market fit. Below 100% means customers are churning faster than you're expanding.
What is a good LTV:CAC ratio?+
The LTV:CAC (Lifetime Value to Customer Acquisition Cost) ratio measures how much profit you generate from a customer relative to what you spent to acquire them. A ratio of 3:1 (LTV is 3x CAC) is the minimum healthy threshold for most SaaS. A 5:1 ratio is strong, and 10:1+ is exceptional. Anything below 2:1 means you're acquiring customers at unsustainable cost - you'll never recoup your acquisition spend. To improve this ratio: increase LTV through expansion, reduce churn, or lower your CAC through more efficient marketing.
How do I calculate my churn rate?+
Churn rate is the percentage of customers you lose in a given period. Formula: (Customers churned this month / Total customers at start of month) × 100%. For example, if you had 100 customers at the start of the month and 5 left, your churn rate is 5%. Monthly churn of 5% or less is healthy for most SaaS. Above 10% is concerning - it means you're losing customers faster than typical. Churn directly impacts LTV: higher churn = lower LTV because customers have shorter lifespans.
What is Quick Ratio and why does it matter?+
Quick Ratio measures how quickly new and expansion revenue is covering your churn. Formula: (New MRR + Expansion MRR) / (Churned MRR + Contraction MRR). A ratio above 4 is excellent (you're growing much faster than you're losing). A ratio above 1 means you're net-positive. Below 1 means churn is outpacing your new business - you're shrinking. Quick Ratio is a leading indicator of whether your business is sustainable at your current growth rate. It's especially useful for early-stage SaaS where NRR can be volatile.
When should I worry about CAC payback period?+
CAC payback period is how many months it takes for a customer to generate enough revenue to pay back what you spent to acquire them. Formula: CAC / ARPU. A payback period of 6–12 months is healthy; anything under 6 months is excellent. Above 12 months is risky - it means you're spending capital today for returns that take over a year to materialize. If your payback exceeds 18 months, your acquisition strategy is unsustainable. You should aim to reduce CAC, increase ARPU, or both. VCs typically want to see payback below 12 months before Series A.
What does ARR mean and how is it different from MRR?+
ARR is Annual Recurring Revenue (MRR × 12), while MRR is Monthly Recurring Revenue. ARR is what investors care about - it's the annualized run rate of predictable, recurring revenue. ARR is used to benchmark company stage: Pre-seed companies have <$100K ARR, seed-stage $100K–$1M, early growth-stage $1M–$5M, and growth-stage >$5M. Use MRR for month-to-month planning and cash management. Use ARR when discussing valuation, fundraising, or comparing your company to benchmarks.
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