About this site

Why it exists

Most marketing calculators online do one of two things: hide the formula so you have to trust the output, or hold the answer behind an email form. Both make the tool worse. A calculator that shows its working can be checked, argued with, and rebuilt in a spreadsheet — which is exactly what you should be able to do before you plan a budget around it.

So every page here prints the expression, defines each variable, walks through a real example, and says plainly where its numbers are soft. Several calculators state on their own pages that they are simplified models rather than exact industry formulas, because the alternative — implying precision that isn't there — makes them worse than useless.

How the numbers are checked

Every formula is exercised automatically against its own worked example on each build. If a calculator returns something other than the figure its walkthrough claims — or if the displayed result loses precision, links to a calculator that doesn't exist, or falls below the content standard the rest of the site meets — the build fails rather than shipping.

That catches arithmetic and consistency. It cannot vouch for the benchmark ranges, which are compiled estimates and are labelled as such wherever they appear. The methodology page sets out exactly what that means.

No signup, no tracking

There is no account, no email gate, and no analytics or advertising tracker on any page. Calculations run entirely in your browser, so the figures you type — revenue, spend, customer counts — are never sent anywhere. That is a property of how the site is built, not a promise about how data is handled.

Who publishes it

This site is published by MarkCelerate.com. Corrections are welcome and acted on: if a formula, benchmark, or example here is wrong, it should be fixed rather than defended. Write to support@markcelerate.com.

Calculator content was last reviewed in full on 2026-08-25.