📐Unit Converter

Online unit converter — convert measurements in one place

Our free unit converter lets you instantly convert length, mass, temperature, volume, area, speed, time and digital data. Just select a category, enter a value and you see the result immediately — no clicking, no data sent to a server. We support both metric and imperial units (inches, feet, yards, miles, pounds, gallons).

Temperature conversion — Celsius, Fahrenheit and Kelvin

Converting temperatures requires mathematical formulas, not simple multipliers. Our converter correctly applies all formulas: degrees Celsius to Fahrenheit, Fahrenheit to Celsius, and conversion to and from Kelvin. You can also easily swap the conversion direction with the ⇄ button — the values will switch places.

Frequently asked questions

Is the unit converter free?

Yes, completely free with no limits. No login or registration required — conversion happens directly in your browser.

How do I convert inches to centimetres?

Select the `Length` category, set `inch (in)` in the `From` field, choose `centimetre (cm)` in the `To` field, enter a value and the result appears instantly. 1 inch = 2.54 cm.

How does temperature conversion work?

Temperature is converted using mathematical formulas: Celsius to Fahrenheit (°C × 9/5 + 32), Celsius to Kelvin (°C + 273.15) and their inverses. Results are precise.

Which unit categories does the converter support?

The converter supports 8 categories: Length, Mass, Temperature, Volume, Area, Speed, Time and Digital Data — with dozens of units in each category.