Unit & Measurement Converter

Length, weight, temperature, area, speed, data & more — instant and offline.

Free unit converter: length, weight, temperature, area, speed and data. Convert mm to inches or metric to imperial instantly — private, in your browser.

About Unit & Measurement Converter

The Unit & Measurement Converter is a free, in-browser tool that converts a value between units across eight categories — length, mass/weight, temperature, area, volume, speed, data, and time — and shows it in every unit of that category at once. It uses exact, standards-based factors (e.g. 1 inch = 0.0254 m, 1 lb = 0.45359237 kg, 1 mile = 1609.344 m) and keeps decimal (kB) and binary (KiB) data units distinct. All math runs locally — no signup, no upload.

How to use Unit & Measurement Converter

  1. Pick a category — Length, Mass/Weight, Temperature, Area, Volume, Speed, Data, or Time.
  2. Type your value; decimals, scientific notation (1e3), and thousands separators (1,000) are all accepted.
  3. Choose the From and To units from the dropdowns, or hit the swap button to reverse them.
  4. Read the converted result instantly, plus the value in the category's base unit.
  5. Use Copy result or Copy full to grab just the number or the whole "1 km = 0.62 mi" line.
  6. Scan the All units panel on the right to see your value in every unit at once, and copy any row.

Frequently asked questions

Is it free, and do I need an account?
Yes, it is completely free with no signup. Just open the page and start converting.
Is my data uploaded anywhere?
No. Every conversion is pure offline math that runs in your browser — nothing you type is sent to a server or stored remotely.
Which categories and units are supported?
Eight categories: length, mass/weight, temperature, area, volume, speed, data, and time. Each has a full set of metric and imperial units, including nautical miles, stones, US/UK tons, US and Imperial gallons, knots, and Kelvin.
How accurate are the conversions?
Conversions use exact, internationally defined factors where one exists — 1 inch = 0.0254 m, 1 pound = 0.45359237 kg, 1 mile = 1609.344 m, and the US gallon as exactly 231 cubic inches. Temperature is converted through Kelvin to handle the offsets correctly.
What is the difference between MB and MiB here?
The Data category keeps them separate: decimal units (kB, MB, GB, TB) are powers of 1000, while binary IEC units (KiB, MiB, GiB, TiB) are powers of 1024. So 1 MiB = 1,048,576 bytes but 1 MB = 1,000,000 bytes.
Can I enter scientific notation or big numbers with commas?
Yes. The value field accepts decimals, scientific notation like 1e3, and thousands separators like 1,000. Invalid input shows a clear message instead of a wrong number.

People also search for

Unit & Measurement Converter is also known as unit converter app, convert mm to inches, metric to imperial converter, length and weight converter, temperature unit converter, unit conversion calculator, measurement converter.