About CalcTimer
CalcTimer is a collection of small tools that run in your browser. No installation, no account, no waiting through an ad to see a number. The English edition covers the tools that work anywhere in the world.
How it works
Every tool runs entirely in your browser. Values you type are never sent to a server, and the PDF and image tools process files on your own device rather than uploading them. The QR code generator is the one exception: it asks an outside service to draw the image, so the text you enter is sent there. That makes them safe for contracts, ID scans and anything else you would rather not hand to someone else's server.
Favourites and the large-text setting are stored in your browser's local storage and are not synced between devices. See the privacy policy for details.
Accuracy
Calculators show the formula and assumptions they use. They are reference figures, not professional advice. Health tools such as BMI and BMR follow standard formulas but do not account for individual circumstances, and they are not a substitute for a medical assessment.
Why some tools are Korean only
The Korean edition includes tools built around Korean tax rules, payroll law and lottery formats. Those calculations would be wrong anywhere else, so they are not translated rather than published as misleading English pages. You can reach the full Korean set from the language toggle in the header.
Corrections and contact
If a result looks wrong, or a tool you need is missing, send a note. Mentioning which tool and which input values produced the problem makes it much faster to fix.
Who runs this
Popular tools
If you have read this far, you can start right here. The list on the left shows every tool by category, and the search box takes a partial name.