Free Unit Conversion Tools
Length, weight, temperature, volume and more. Instant conversion between metric and imperial.
Unit Converter
Free online unit converter. Convert length, weight, temperature, area, volume, speed, and more. 50+ unit types, instant results.
Interactive Periodic Table
Free interactive periodic table of elements with detailed information for all 118 elements. Click any element to see properties, electron configuration, discovery history, and more.
Frequently Asked Questions
Is this unit converter free to use?
Yes. All conversion tools on UnitTools are completely free, with no registration, no usage limits and no hidden fees.
Which units can I convert?
The converter covers 50+ unit types across length, weight, temperature, area, volume and speed — from meters, feet and miles to kilograms, pounds, ounces, Celsius, Fahrenheit, liters and gallons.
How accurate are the conversions?
Conversions use internationally defined exact factors (for example 1 inch = 2.54 cm exactly). Temperature conversions follow the standard Celsius–Fahrenheit and Celsius–Kelvin formulas.
Does the tool work on mobile devices?
Yes. Every tool is fully responsive and works in any modern browser on phones, tablets and desktops — nothing to install.
Is my data sent to a server?
No. All conversions run locally in your browser with JavaScript. The values you enter never leave your device.