A collection of calculators built to actually be useful
Published by Cocolator
Cocolator is an independently produced and maintained practical digital-tool project.
Cocolator started as a small, independent project.
Most calculators here began with a very ordinary question: what does this actually cost, how long will this take, what happens if one assumption changes, or is there a quicker way to check this without opening a spreadsheet.
That is still the filter for what gets added. Cocolator would rather publish a smaller number of tools that solve real questions clearly than a huge list of thin calculators that all feel the same.
The goal is to keep everything easy to find, simple to use and free. Cocolator is still growing, and the tools and explanations keep getting refined so the site becomes more useful over time.
Fast to answers
The tools should feel easy even when you are only here for three minutes. No accounts, no sign-ups.
Clear explanations
Every calculator explains what the result means and how it was worked out. No guesswork.
No unnecessary data
What you type into the calculators stays in your browser. We do not save your inputs.
What gets built
New tools are added when they answer a concrete question better than a generic search result or a quick spreadsheet. The aim is clarity before volume.
How the tools are written
The explanations, assumptions, and examples are there to help you understand the result, not just produce a number. If something is only an estimate, that should be obvious.
How the site improves
Cocolator is adjusted continuously when something is unclear, when a calculator needs a better example, or when a recurring question clearly deserves a better tool.
How the tools are checked
Read how formulas, assumptions, sources, testing, translations and corrections should be handled before and after a tool is published.
Read our editorial standards