SaaS Metrics Calculator
Put in one month of revenue and customer numbers for a subscription business. This works out every common health metric — how fast you are growing, how much revenue and how many customers you keep, and whether your spending on growth is paying off.
Every field has a short note explaining what to enter, and every result comes with a plain-English explanation and a benchmark. MRR below means monthly recurring revenue: the total your customers pay you each month.
How each number is worked out
Revenue: MRR and ARR
End-of-month revenue = starting revenue + new + upgrades − downgrades − cancellations. ARR is that figure × 12. Net new revenue is the change over the month, and the growth rate expresses it as a percentage of where you started.
ARPA
Average revenue per account = end-of-month revenue ÷ end-of-month customers. It feeds into both LTV and CAC payback, so a steady or rising ARPA quietly improves everything downstream.
Churn: gross vs net
Gross revenue churn = (cancellations + downgrades) ÷ starting revenue — money lost from the customers you already had. Net revenue churn subtracts upgrade revenue from that; when upgrades outweigh losses it goes below zero, which is the sign of a very sticky product. Customer churn = customers lost ÷ starting customers, and its inverse is the average customer lifetime in months.
Retention: NRR and GRR
GRR = (starting revenue − downgrades − cancellations) ÷ starting revenue. It caps at 100% and shows how sticky your revenue is before any upsell. NRR adds upgrade revenue back in, so a figure above 100% means your existing customer base grows on its own, before a single new sale.
Cost of growth: CAC, LTV, payback, Quick Ratio
CAC = sales & marketing spend ÷ new customers. LTV = (ARPA × gross margin) ÷ monthly customer churn. LTV:CAC compares the two. CAC payback = CAC ÷ (ARPA × gross margin), in months. The Quick Ratio = (new + upgrade revenue) ÷ (cancelled + downgrade revenue) sums up growth efficiency in one number.
Benchmarks
| Metric | Healthy | Watch | Poor |
|---|---|---|---|
| Gross revenue churn (per month) | < 3% | 3–6% | > 6% |
| Net revenue churn (per month) | ≤ 0% | 0–3% | > 3% |
| Customer churn (per month) | < 3% | 3–6% | > 6% |
| Net revenue retention (NRR) | ≥ 105% | 90–105% | < 90% |
| Gross revenue retention (GRR) | ≥ 90% | 80–90% | < 80% |
| LTV : CAC | 3–5× | 1.5–3× (or > 5×) | < 1.5× |
| CAC payback | < 12 months | 12–18 months | > 18 months |
| Quick Ratio | ≥ 4 | 2–4 | < 2 |
These are rough norms for businesses selling to small and mid-sized companies. Businesses selling to large enterprises run much lower churn. Very small companies see big swings month to month, so use a rolling three-month average for anything you report.
Frequently asked questions
What is a good LTV:CAC ratio for a SaaS business?
Around 3 to 1 is the common rule of thumb: each customer is worth about three times what you spent to win them. Below 1 to 1 you lose money on every customer. Much above 5 to 1 often means you are being too cautious and could spend more on growth.
How do you calculate SaaS churn?
Customer churn = customers lost during the period ÷ customers you had at the start. Gross revenue churn = (revenue lost to cancellations + revenue lost to downgrades) ÷ revenue at the start. Net revenue churn subtracts revenue gained from upgrades, so strong upgrades can bring it to zero or below.
What is the difference between gross and net revenue retention?
Gross revenue retention (GRR) measures how much of your starting revenue you keep after downgrades and cancellations. It can never go above 100%. Net revenue retention (NRR) also adds revenue from existing customers who upgraded, so it can go above 100% when upgrades outweigh losses.
What is the SaaS Quick Ratio?
Quick Ratio = (new revenue + upgrade revenue) ÷ (cancelled revenue + downgrade revenue). It shows how efficiently you add recurring revenue compared with losing it. Above 4 is strong; below 1 means your revenue is shrinking.
How is the CAC payback period calculated?
CAC payback in months = CAC ÷ (ARPA × gross margin). It is how many months of gross profit from an average customer it takes to earn back what you spent acquiring them. Under 12 months is generally healthy for a business selling to small companies.
Do the numbers I enter get sent anywhere?
No. The calculator runs entirely in your browser. Nothing you type is uploaded or stored on a server.