Unit Converter

Convert length, weight, temperature, and more

What is Unit Converter?

The Unit Converter is a free online tool that converts values across fourteen categories: length, weight, temperature, area, volume, speed, time, digital data, pressure, energy, power, frequency, data rate, and angle. It handles dozens of unit types within each category, so you can switch between meters and feet, kilograms and pounds, Celsius, Fahrenheit, Kelvin and Rankine, square meters and acres, liters and gallons, kilometers per hour and miles per hour, megabytes and gigabytes, bar and psi, joules and kilowatt-hours, watts and horsepower, hertz and RPM, megabits per second and gigabits per second, or degrees and radians. Length now reaches from the nanometer and angstrom up to the light-year, weight spans the microgram, carat and grain through the metric ton, and volume adds cooking measures like the tablespoon and teaspoon alongside the oil barrel. Conversions are calculated instantly in your browser as you type, with no signup and no limits. Temperature conversions are handled correctly using the proper formulas rather than simple ratios, so Celsius, Fahrenheit, Kelvin and Rankine always agree, making the tool useful for everyday life, study, science, and technical work.

How to use Unit Converter?

Converting a unit is quick and updates in real time:

  1. 1 Select a category at the top: length, weight, temperature, area, volume, speed, time, data, pressure, energy, power, frequency, data rate, or angle. This determines which units are available.
  2. 2 Type the value you want to convert into the input field. The result updates as you type, so there is no button to press.
  3. 3 Choose the source unit in the From menu and the target unit in the To menu from the units available in the chosen category.
  4. 4 Read the converted result and the formula used, then use the swap button to reverse the conversion direction in a single click.

Why use this tool?

Unit conversion comes up constantly in cooking, travel, science, engineering, fitness, computing, and electronics, and doing it by hand invites mistakes, especially with temperature where a simple ratio gives the wrong answer. This tool removes that risk by applying the correct formula for each category and showing the result instantly. Covering fourteen categories with dozens of units in one place means you do not need separate apps for weight, distance, energy, power, pressure, or data. Engineers can move between pascals, bar, atmospheres and psi; students can convert joules to kilowatt-hours or hertz to RPM; and astronomers can reach for the light-year. It works entirely in your browser, so it is fast, private, and available offline once loaded. Whether you are following a recipe in metric, reading a foreign road sign, sizing a file, or checking a tire pressure, the answer is one tap away.

Examples

Following a recipe

Convert 250 grams of flour to ounces, 180 Celsius to Fahrenheit, or 3 tablespoons to milliliters when a recipe uses units your kitchen tools do not.

Engineering and physics

Turn 1 bar of pressure into psi, 1 kilowatt-hour of energy into joules, or 2400 RPM into hertz when working through a problem set.

Sizing files and connections

Convert 1500 megabytes to gigabytes to check a download, or 100 megabits per second to gigabits per second when comparing internet plans.

Frequently Asked Questions

Is the Unit Converter free to use?

Yes. The tool is completely free with no signup, no limits, and no account required. You can convert as many values as you like.

How many categories does it support?

It supports fourteen categories: length, weight, temperature, area, volume, speed, time, digital data, pressure, energy, power, frequency, data rate, and angle, each with several to dozens of unit types.

Are temperature conversions accurate?

Yes. Temperature conversions between Celsius, Fahrenheit, Kelvin, and Rankine use the correct formulas rather than simple multiplication, so the results are precise across all four scales.

Can it convert pressure, energy, and power units?

Yes. Pressure covers pascals, kilopascals, megapascals, bar, psi, atmospheres, mmHg, and torr; energy covers joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, and electronvolts; and power covers watts, kilowatts, megawatts, horsepower, and BTU per hour.

Do I need to press a button to convert?

No. The conversion updates in real time as you type, and the swap button lets you reverse the direction instantly.

Related Tools

Explore more free tools you might find useful