SaaS Monetization Calculator
Turn your pricing tiers and unit economics into the numbers that actually decide whether a SaaS works. Set your tiers and the calculator derives blended ARPU, LTV, the LTV:CAC ratio, CAC payback and net revenue retention — with a health read on each. Runs entirely in your browser.
SaaS monetization health comes down to a few ratios: LTV (margin-adjusted lifetime value), CAC (cost to acquire a customer), the LTV:CAC ratio (roughly 3:1 is healthy), and CAC payback (months to recover acquisition cost). Your pricing tiers set the blended ARPU that drives all of them.
1 — Pricing tiers
| Tier | Price / month | Customer mix % | Contribution |
|---|
2 — Unit economics
3 — Results
Your tiers and inputs stay in your browser (local storage only). Nothing is uploaded.
How the metrics connect
Your pricing tiers and customer mix produce blended ARPU. ARPU, gross margin and churn produce LTV. LTV against CAC gives you the headline ratio — and CAC payback tells you whether you can survive the wait to get there.
The formulas
Blended ARPU = Σ (tier price × tier's share of customers).
Customer lifetime = 1 ÷ monthly churn rate.
LTV = (ARPU × gross margin) ÷ monthly churn.
LTV:CAC = LTV ÷ CAC · CAC payback = CAC ÷ (ARPU × gross margin).
Net revenue retention = 1 + monthly expansion − monthly churn.
Founders chase the LTV:CAC ratio and miss the assassin sitting next to it: CAC payback. You can post a gorgeous 5:1 ratio and still run out of cash, because that "5x" arrives over three or four years while you front the entire CAC today. A 4:1 ratio with a 9-month payback is a stronger business than a 6:1 ratio with a 28-month payback. The ratio measures whether the customer is profitable; payback measures whether you'll still be solvent by the time they prove it.
Move the customer-mix sliders before you touch list prices. Shifting even 10% of customers from your entry tier to mid-tier often lifts blended ARPU more than a price rise — and without the churn risk a price increase carries.
This is a steady-state diagnostic, not a financial model. It assumes a constant churn and margin, and ignores annual-billing dynamics, discounting, cohorts and seasonality. Use it to spot a problem fast, then confirm with your finance team's detailed model before you act.
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Frequently asked questions
What does the SaaS monetization calculator do?
It turns your pricing tiers and unit economics into the metrics that decide whether a SaaS is healthy. From tier prices and customer mix it derives blended ARPU, then computes lifetime value, the LTV to CAC ratio, CAC payback period and net revenue retention in one view.
How is blended ARPU calculated?
Blended ARPU is the weighted average monthly revenue per account across your tiers. The calculator multiplies each tier's price by its share of customers and sums the results. Changing your customer mix toward higher tiers raises blended ARPU without changing a single list price.
How is LTV calculated here?
Lifetime value is blended ARPU multiplied by gross margin, divided by your monthly churn rate. Using gross margin rather than raw revenue is deliberate: it counts the profit a customer brings, not the top-line, which is the only version of LTV worth comparing against acquisition cost.
What is a good LTV to CAC ratio?
Around three to one is the common benchmark for a healthy SaaS. Below one means you lose money on every customer. Far above five often signals under-investment in growth — you could likely afford to acquire faster and capture more of the market.
What is CAC payback period?
CAC payback is how many months of gross profit it takes to earn back the cost of acquiring a customer. It is acquisition cost divided by monthly ARPU times gross margin. Under twelve months is generally strong; beyond eighteen months strains cash even when the LTV to CAC ratio looks fine.
What is net revenue retention?
Net revenue retention tracks how revenue from existing customers changes over time, combining expansion against churn and contraction. Above one hundred percent means your base grows even with no new customers — the strongest signal of durable SaaS economics that investors look for.
Why use gross margin in LTV?
Because revenue is not profit. A customer paying one hundred dollars at seventy percent margin is worth seventy dollars to the business, not one hundred. Ignoring margin inflates LTV and makes unhealthy acquisition spend look justified. The margin-adjusted figure keeps the comparison honest.
How does churn affect the numbers?
Churn is the single biggest lever on lifetime value, because LTV divides by it. Average customer lifetime is one divided by the monthly churn rate, so cutting churn from five to three percent extends lifetime from twenty to thirty-three months and lifts LTV by two thirds.
Does this calculator save my data?
Your tiers and inputs are stored only in your own browser using local storage, so they survive a refresh and never leave your device. Nothing is uploaded to a server and no sign-up is required. Use the Reset button to clear everything and restore the example.
What does the calculator not account for?
It models steady-state unit economics, not the full picture. It does not handle annual versus monthly billing nuances, discounting, seasonality, cohort differences or one-off setup fees in depth. Treat it as a fast diagnostic to spot problems, then validate with your finance team's detailed model.