Unit Converter
Convert cm to inches, kg to pounds, km to miles, Celsius to Fahrenheit and more — instantly in your browser.
Why Use Our Unit Converter?
Instant Conversion
Results appear as you type. No loading, no waiting. Supports 50+ unit pairs across 7 categories — from everyday needs like cm to inches to specialized ones like nautical miles.
100% Private & Offline
All calculations happen in your browser. No data is sent to any server. Works offline after the first load — perfect for travel when you have no internet connection.
Works Everywhere
Use it on your phone, tablet, or desktop. Responsive design adapts to any screen. No app install needed — just a bookmark and you are ready to convert.
Everyday Essentials
The conversions people search for most: cm to inches, kg to lbs, km to miles, Fahrenheit to Celsius. Plus cooking measurements, data storage, land area, and speed units.
Frequently Asked Questions
How accurate are the conversions?
Our conversions use precise mathematical formulas with high-precision floating-point arithmetic. For everyday use (cooking, travel, DIY), the accuracy is more than sufficient. We show up to 8 significant digits for precision-critical work.
Does this work offline?
Yes! After the first load, the converter works completely offline because all calculations run in JavaScript in your browser. No server calls are made during conversion. This makes it perfect for travel when you do not have internet access.
What unit categories are supported?
We support 7 categories: Length (mm, cm, m, km, in, ft, yd, mi, nmi), Weight (mg, g, kg, t, oz, lb, st), Temperature (Celsius, Fahrenheit, Kelvin), Volume (mL, L, fl oz, cup, pint, quart, gallon, tbsp, tsp), Speed (m/s, km/h, mph, knots, ft/s), Area (cm2, m2, km2, hectares, ft2, acres, mi2), and Data (Bytes, KB, MB, GB, TB, bits, Kbit, Mbit).
Is my data sent to any server?
No. All conversions are calculated locally in your browser using JavaScript. No values, no unit selections, no conversion history is ever sent to our servers or any third party. Your calculations are completely private.
Why use this instead of Google?
Google requires an internet connection and tracks your searches. Our converter works offline, respects your privacy with zero tracking, and provides a dedicated interface with swap, copy, and quick-reference features that Google does not offer. Plus, our PWA can be installed on your home screen for instant access.