Unit & Data Converter

Convert between 110+ units across 14 categories — length, mass, temperature, data, power, angle, frequency, fuel economy and more.

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What is this unit converter?

This free tool converts between more than 110 units across 14 categories — length, mass, volume, temperature, speed, area, pressure, energy, time, digital storage, power, angle, frequency and fuel economy — with bidirectional inputs, locale-aware number formatting and a list of popular conversions per category.

How do I convert units online?

Pick a category, choose the from and to units and type a value on either side. The other side updates instantly; everything runs in your browser.

Key features

14 categories, 110+ units
From metric to imperial to SI/IEC bytes — the catalog covers the conversions you actually need.
Bidirectional inputs
Type on either side; the other field updates live so you can work in any direction.
Locale-aware numbers
Inputs accept 1.234,56 or 1,234.56 and results display in the format used by your language.
Popular conversions panel
Each category surfaces commonly-asked conversions at the current value with one-click swap.

How to use it

Click a category at the top, set the from / to units, type a value. Open the swap button (↔) to flip direction or click any popular row to use that pair.

Frequently asked questions

What is the difference between KB and KiB?

KB (kilobyte) is the SI decimal unit: 1 KB = 1,000 bytes. KiB (kibibyte) is the IEC binary unit: 1 KiB = 1,024 bytes. RAM is usually reported in binary units; disk vendors mostly use decimal.

How accurate are the conversions?

Every factor is encoded at double-precision (about 15 significant digits). Round-trip conversions are within floating-point error, which is more than enough for practical use.

Can I edit either side of the conversion?

Yes. Both inputs are live — type on the left, the right updates; type on the right, the left updates.

Does anything I type get uploaded?

No. The whole tool runs in your browser; numbers and results never leave your device.

Factors are sourced from BIPM (SI), NIST and IEC 60027-2 for binary prefixes. Temperatures use exact Celsius/Fahrenheit/Kelvin relations; volumes use US customary by default with a UK gallon clearly labelled.