Tools
Calculators that show their working
Nothing is sent anywhere. Everything runs in your browser, and every result is a link you can share.
How these work
What happens to the numbers you type?
Nothing leaves your browser. There is no backend, no API call and no analytics on your inputs, so we never see any of it.
These calculators ask for genuinely sensitive commercial numbers: deal values, margins, close rates. So they are built so that nothing you type can reach us even if we wanted it. All the arithmetic runs in your browser, there is no server involved, and no input is recorded anywhere.
Your inputs are encoded into the page URL as you type, which is what makes a configured result shareable. That link is yours: it goes nowhere until you send it somewhere. If you would rather it did not exist, clear the query string.
Every result shows the arithmetic behind it, and where a number is technically valid but commercially implausible the tool says so instead of printing it flat. A calculator that confidently returns an absurd answer is worse than one that errors, because nobody notices.
All tools
Target CPL calculator
Work back from deal value and gross margin, through four funnel stages, to the cost per lead you can afford, the cost per click that implies, and the monthly budget needed to hit a deal target. Includes a close-rate sensitivity table.
Agency vs in-house cost calculator
Build up the fully-loaded cost of a marketing hire, from employer costs and tooling through management time, recruitment and ramp, and hold it against agency and freelancer models at equal scope.
A/B test significance calculator
Significance, p-value and the confidence interval significance is usually mistaken for, plus the sample size and runtime your sensitivity requires and a straight answer on whether the test is worth running at all.
Want the numbers checked?
A calculator is only as good as the rates you feed it. If yours are estimates rather than measurements, that is the more useful thing to fix.