★ The numbers your investor will ask for
SaaS Metrics Calculators
12 calculators, each with the formula, a worked example and benchmarks. So you know what "good" looks like before the board meeting.
- Runs in your browser
- No signup
Unit economics
- M-01LTVHow much gross profit is one customer worth?LTV = (ARPA × gross margin) ÷ monthly churn rate
- M-02CACWhat does it cost to win one new customer?CAC = sales & marketing spend ÷ new customers acquired (same period)
- M-03LTV:CACDoes each customer earn back what they cost to acquire?LTV:CAC = [(ARPA × gross margin) ÷ monthly churn] ÷ CAC
- M-04PaybackHow many months until a customer pays back their acquisition cost?CAC payback (months) = CAC ÷ (ARPA × gross margin)
Retention
- M-05ChurnWhat share of customers leave each month?monthly churn = customers lost in month ÷ customers at start of month
- M-06NRRDoes revenue from existing customers grow or shrink?NRR = (starting MRR + expansion − contraction − churned MRR) ÷ starting MRR
- M-07Quick ratioIs growth outrunning churn, or are we refilling a leaky bucket?quick ratio = (new MRR + expansion MRR) ÷ (churned MRR + contraction MRR)
Growth
Efficiency
- M-10Burn multipleHow much cash do we burn for each dollar of new ARR?burn multiple = net burn ÷ net new ARR (same period)
- M-11Magic numberDoes sales and marketing spend turn into recurring revenue?magic number = net new ARR this quarter ÷ sales & marketing spend last quarter
- M-12Rule of 40Is the balance of growth and profit healthy?Rule of 40 score = revenue growth rate (%) + profit margin (%)
01
Which metric answers which question
Start from the question you are trying to answer, not the acronym.
| If you want to know… | Use |
|---|---|
| Are we growing fast enough? | MRR growth |
| Do customers stay? | Churn |
| Do existing customers spend more over time? | NRR |
| Does a customer pay back what they cost? | Payback |
| Is the business model sound per customer? | LTV:CAC |
| Is our burn buying growth? | Burn multiple |
| Should we spend more on sales and marketing? | Magic number |
| Is growth outrunning churn? | Quick ratio |
| Is the growth and profit balance healthy at scale? | Rule of 40 |
Every calculator runs in your browser. Nothing you type is sent anywhere, so it is safe to use real numbers.
02
Questions founders actually ask
Which SaaS metrics matter most at seed stage?
MRR growth, churn and CAC payback. They are the ones you can measure reliably with a few months of data, and they answer the questions seed investors ask: are people paying, are they staying, and does acquiring them make sense.
Which metrics do Series A investors ask for?
Usually ARR and its growth rate, net revenue retention, gross margin, CAC payback or LTV:CAC, and burn multiple. Have the definitions written down, because investors will check how you calculated each one.
Should I calculate metrics monthly or annually?
Track monthly, report on a rolling three-month or annual basis. Monthly numbers at small scale swing with a handful of deals; NRR in particular is defined over a year.
Are these calculators accurate enough for a board deck?
The formulas are the standard ones and the maths is exact. Accuracy depends on your inputs: use fully loaded costs, exclude one-off revenue, and say which definition you used.
03
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Fine print
Tools: on the house.
Engineer: by the hour.
Moving them is the expensive part, and the part I'm good at: activation flows, upsell moments and the product work behind better numbers.
I'm Himanshu, an AI and full-stack engineer. I build MVPs, AI agents and the growth plumbing around them for early-stage startups.