Free tools for everyday questions
Calculators, converters, image and PDF tools. Free, private, no sign-up.
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- Free, no sign-up
- Files stay on your device
- Instant results
- Works on any phone
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Health & Fitness
Unit Converters
Date & Time
Pregnancy & Baby
Physics & Science
Everyday Life
About ToolRuby
ToolRuby has free calculators, converters and file tools for everyday life, from mortgage payments and due dates to shrinking a photo for email.
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Who it’s for
Our tools are made for everyday people, not specialists. Each one asks only for what it needs, uses US units by default with a metric switch, and explains the result in plain English.
How our tools are built and reviewed
Every calculator is built from published formulas and tested against worked examples before it goes live. Health tools are reviewed by registered dietitians and physicians, and finance tools by certified financial professionals. Each tool page shows its formula, sources, reviewer and last-updated date.
Your privacy
Most image and PDF tools process files in your browser, so your files are never uploaded. When a tool needs our server for a heavy conversion, the page says so and the file is deleted after one hour.
FAQ
Are all the tools really free?
Yes. Every calculator and converter is free to use with no sign-up and no limits. The site is supported by ads.
Do you upload my files?
Not for most image and PDF tools: they run inside your browser, so your files never leave your device. The few tools that need a server say so on the page and delete files after one hour.
How accurate are the calculators?
Each calculator uses published formulas, is checked against worked examples, and shows its formula and sources on the page. Health and finance tools are reviewed by qualified reviewers.
Can I use the tools on my phone?
Yes. Every tool is designed for phones first and works the same on tablets and computers.