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Calculators

The numbers of the trade, ready to use

Nine free tools, no sign-up. Each one gives the formula written out in full, a worked example already calculated, and a form to redo the calculation with your own figures. The default values are working assumptions, except those that carry a source.

A desk from above: laptop, calculator, cup of tea and notebook.

How these tools are built

A formula, an example, a form

Every page follows the same plan. First the formula, written in plain English, so the calculation can be checked by hand. Then an example with fixed figures, calculated once and readable without enabling anything. Finally the form, which applies the same formula to what you type. The results update on every keystroke.

The lesson The numbers of the trade explains each calculation in the order of the course, and the lesson The creator-agency contract walks through the contract generator clause by clause.

Frequently asked questions

Three questions about these tools

Do these pages need JavaScript?

No. Each page shows the formula written out in full and an example already calculated in a table. The form updates the results in the browser, but the page is complete without it.

Where do the default values come from?

The values that carry a source are cited with the link and the date they were checked: the 20% commission published in the OnlyFans terms, the prices published by a conversation tool, the thresholds and rates published by the French administration. All the others are working assumptions, labeled as such, to be replaced with your own figures.

Are these tools advice?

No. They are informational calculations. The contract generator produces a working draft to be reviewed by a legal professional, and the French micro-entreprise simulator points to the official pages that are authoritative.