About ToolFacil

ToolFacil ("easy tools") is a collection of free online tools for the small questions that come up every day: What date is 90 days from today? How many hours did I work this week? What is 15% of 80?

What we believe

• Fast: answers appear while you type, on any phone or computer.
• Private: the tools run in your browser. Your dates, numbers and texts are not uploaded to our servers.
• Clear: every tool explains the method with a worked example, so you can check the result yourself.
• For everyone: ToolFacil is available in English, Spanish, Portuguese, German, Italian, French and Turkish.

How we build and check our tools

Each calculator is written from the standard formula (for example ISO 8601 for week numbers and the Gregorian calendar for date maths) and tested against worked examples before it goes live. When we find a mistake or receive a correction, we fix it and update the "last updated" date on the page.

Contact

Have an idea for a new tool or found a problem? Please use our contact page — we read every message.

Last updated: Thursday, October 8, 2026