ConvertToolPro is a free collection of online unit converters built for anyone who needs a quick, reliable answer. Whether you're converting centimetres to inches for a home improvement project, kilograms to pounds at the gym, or Celsius to Fahrenheit for a recipe, we have a dedicated converter for it.
We cover eight categories — length, weight, temperature, speed, volume, area, time, and data storage — with 63 individual converter pages, each designed to give you an instant result with no friction. No accounts, no paywalls, no popups.
Unit conversion is one of those everyday tasks that should be completely effortless. The problem is that most online converters are cluttered with ads, require you to navigate between tabs, or bury the actual converter beneath paragraphs of filler content.
We took a different approach: each page is purpose-built for one conversion, loads fast, and puts the converter front and centre. We add helpful reference points, a conversion table, and clear formulas so you understand the conversion — not just the number.
ConvertToolPro is built and maintained by a small independent team of developers who use these tools every day themselves.
Every converter on this site is free to use with no limits. That will never change.
We don't ask for your email, your name, or anything else. Just convert.
Every conversion uses the standard international definition. No rounding at source.
Pure HTML, CSS, and JavaScript — no frameworks, no heavy scripts. Loads instantly.
Each converter uses the internationally agreed conversion factor between two units. For most conversions this is a simple multiplication — for example, 1 inch = exactly 2.54 centimetres. For temperature conversions, we use the correct offset formulas (not just multiplication) so you always get the right result.
Conversions work in both directions on every page: type in either field and the result updates instantly. You can also click any row in the reference table to pre-fill the converter, or click a quick conversion tile to jump straight to a common value.
If you spot an error or have a suggestion for a new converter, please get in touch.