Unit Economics Calculator
A free calculator that turns a paywall into arithmetic — what a visitor costs, what a paying customer costs, and whether the chain clears. No account, no data, and every scenario is a link.
Open it
Open the calculator — nothing to sign up for, nothing to connect. It runs in the browser and sends nothing anywhere.
The question it answers
Most pricing arguments are about one number, and the number nobody has is what a paying customer actually costs. A paywall with three offers on it hides that behind five rates in a row: what a visitor costs, how many reach the offer, how many tap Buy, how the purchases divide, and how many of those cards are ever charged. Change the price of one offer and all five move.
The calculator makes that chain explicit. You describe what you sell and how traffic reaches it, and the page answers what one tap on Buy is worth, what it has to clear, and what a paying customer costs.
What you describe
- Your offers, at their real prices: one-time or subscription, any cadence, with a free or paid trial and its own terms
- How the purchases divide between them — the rows always add up to all of the purchases
- How many of the people who tap Buy finish the checkout, and how many trial starters are still there when the card is charged
- A downsell and an upsell, each pointed at a price you can keep off the paywall
- Cost per start and the three rates on the way to the offer
- Your volume, as an ad budget or as visitors, per day or per month
What it answers
- Value per tap on Buy, against the figure it has to clear to pay for the visitor
- CAC — divided by the cards actually charged, never by trial starts
- Profit per start, and ROAS on a 12-month basis
- The break-even of every rate: where the chain starts clearing, and where it stops
- Every step in people as well as in percent, at your own volume
How the numbers behave
The defaults are editorial priors from our benchmark book, and every one of them says so until you move it — a chip beside each number reads scenario or yours. Nothing on the page is measured from your funnel, and nothing claims to be: it is a scenario you built, arithmetic you can check.
Where a figure cannot be computed the page says n/a rather than printing a zero that reads as a measurement. Where a rate cannot make the chain clear, it says that in words and not only in colour.
Take it with you
Every scenario is addressable. The page writes what you typed into the URL, so a case is something you can send, bookmark or open two of side by side — and it exports and imports the same scenario as JSON, so a spreadsheet or a teammate can take it further.
Once you are publishing funnels with Segmently, the same arithmetic runs on your measured numbers instead of priors: see Web Funnels for the funnels themselves and Growth Economics for the money layer that reconciles spend and revenue against Stripe.