Unit Converter Online – Convert Length, Weight, Temp & More

Recipes in cups when your scale reads grams, a height in feet when your form wants centimetres, a file size in megabytes when the limit is quoted in gigabytes: unit conversion is a small daily friction that this tool removes. Our free unit converter covers seven categories: length, weight, temperature, volume, area, speed and digital storage. Conversions use exact international factors, results appear as you type, and a swap button reverses the direction instantly when you need the answer the other way round.

Quick Answer: Choose a category, enter a value, and pick the from and to units. The converted result appears instantly, and the swap button reverses the conversion with one click.

Free Online Tool

Unit Converter

Accurate conversions across seven everyday categories.

Category

Value

From

Table of Contents

How to Use the Unit Converter

Select the category that matches what you are converting, such as Length or Temperature.
Enter the value you have in the input field.
Choose the unit your value is in and the unit you want it converted to.
Read the result; it updates live as you change any field.
Use the Swap button to reverse the direction, for example after checking that a return conversion matches.

Key Features

Seven categories with the units people actually meet daily, from kilometres and kilograms to gigabytes and knots.
Temperature uses proper formulas, not simple factors, so Fahrenheit and Celsius conversions are exact.
Live conversion with a swap button and plenty of decimal precision.
Data storage uses the standard binary (1024) convention used by operating systems, clearly stated.
Private, instant and unlimited, with no account or upload involved.

Best Practices and Tips

For cooking, volume conversions are approximations: a US cup of flour and a cup of water differ in grams, so weigh ingredients where precision matters.
Check whether a storage figure uses 1000 (manufacturer marketing) or 1024 (operating systems); this converter uses 1024, and the difference explains 'missing' gigabytes on new drives.
Round sensibly for the audience: a converted height for a form wants centimetres, not six decimal places.
When converting speed limits while driving abroad, km/h to mph matters; bookmark the category for the trip.

Common Mistakes to Avoid

Confusing US and imperial gallons, which differ by about 20 percent; this converter uses US gallons and says so in the unit name.
Treating temperature differences like absolute temperatures: a rise of 10 °C is a rise of 18 °F, not 50 °F; formulas here convert absolute readings.
Converting area or volume by the length factor instead of its square or cube: 1 square metre is not 3.28 square feet.

Frequently Asked Questions

Which units does the converter cover?

Length (mm, cm, m, km, inches, feet, yards, miles), weight (g, kg, tonnes, ounces, pounds, stones), temperature (°C, °F, Kelvin), volume (ml, litres, US cups, fluid ounces, US gallons), area (square metres, square feet, acres, hectares), speed (km/h, mph, m/s, knots) and data (bytes, KB, MB, GB, TB).

Are the conversions accurate?

Yes. All factors are the internationally defined exact values (an inch is exactly 25.4 mm, a pound exactly 0.45359237 kg), and temperature uses the standard formulas, so results are correct to the displayed precision.

Why does my 1 TB drive show about 931 GB?

Drive makers count a terabyte as 1000 GB, while operating systems count in 1024-based units (technically GiB). Both are describing the same bytes; this converter uses the 1024 steps, matching what your computer reports.

Can I convert currencies here?

No. Exchange rates change constantly and require live market data, which a static converter cannot provide honestly. Use a financial service for currency, and this tool for physical units.

What is the difference between a US cup and a metric cup?

A US customary cup is about 236.6 ml, while a metric cup used in Australia and elsewhere is 250 ml. This converter uses the US cup and labels it clearly in the unit list.