About Online Unit Conversion
Online Unit Conversion is a fast, accurate, and completely free unit conversion calculator that helps millions of users convert between over 750 units across 40+ categories.
Our Mission
We believe that unit conversion should be simple, accurate, and accessible to everyone. Whether you're a student, professional, or just need to convert units for everyday tasks, our tools provide reliable results you can trust.
What We Offer
- Over 750 units across 40+ categories
- Accurate conversions with up to 6 decimal places precision
- Fast, instant calculations
- Mobile-friendly responsive design
- Completely free to use
- No registration or personal information required
Popular Categories
Our most popular conversion categories include length, weight, temperature, volume, area, time, speed, and many more. Each category contains comprehensive units from metric to imperial systems and specialized units for specific industries.
Accuracy Promise: We have done our best to make sure these conversions are both accurate and correct. Our conversions are generally accurate to at least 6 decimal places (1/1,000,000).