What unit categories does this converter support?

The unit converter supports 8 categories: Length (metre, km, mile, foot, inch, etc.), Weight/Mass (kg, lb, oz, gram, etc.), Temperature (Celsius, Fahrenheit, Kelvin, Rankine), Area (m², km², acre, hectare, etc.), Volume (litre, gallon, pint, cup, etc.), Speed (km/h, mph, knot, Mach, m/s), Data Storage (bit, byte, KB, MB, GB, TB, PB), and Time (second, minute, hour, day, week, month, year).

How do I convert Celsius to Fahrenheit?

Select the Temperature category, choose Celsius as the From unit and Fahrenheit as the To unit, then enter your temperature value. The converter applies the formula F = (C × 9/5) + 32. For example, 37°C (body temperature) equals 98.6°F. You can also convert to Kelvin or Rankine in the same step.

How do I convert km to miles?

Select the Length category (default on load), ensure Kilometre (km) is selected as the From unit and Mile (mi) as the To unit, then type your distance value. The converter multiplies by 0.621371 to give you miles. For example, 100 km = 62.14 miles. Use the swap button (⇄) to instantly reverse the direction.

Can I convert in reverse — enter the result and get the source value?

Yes. The unit converter is fully bidirectional. You can type a value in either the From or To field and the other field updates instantly. You can also click the Swap button to switch the two selected units and reverse the direction of conversion.

Is this unit converter free and does it work offline?

Yes, this unit converter is completely free with no sign-up required. All conversions run entirely in your browser — no network request is needed. After the first load, the tool works offline as part of UtilityBox's PWA support.

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Unit Converter

Convert length, weight, temperature, area, volume, speed, data and time.

Unit Converter — Free Online Length, Weight, Temperature & More Converter

UtilityBox's free unit converter lets you instantly convert values across 8 measurement categories: length, weight/mass, temperature, area, volume, speed, data storage, and time. With 70+ units available — from kilometres to miles, kilograms to pounds, Celsius to Fahrenheit, litres to gallons, and gigabytes to terabytes — this is the only online unit converter you'll need for everyday calculations. Conversion works in both directions: type in either the From or To field and the result updates live. A swap button lets you reverse the units in one click. Reference chips below the converter show popular equivalents for quick cross-checking. Everything runs client-side in your browser — no page reload, no sign-up, and no data leaves your device.

How to Use the Unit Converter

Click a category tab at the top — choose from Length, Weight, Temperature, Area, Volume, Speed, Data, or Time.
Select the From unit and To unit from the two dropdowns on either side.
Type a value in the From field. The converted result appears instantly in the To field without clicking any button.
To convert in the reverse direction, simply type in the To field — the From field will update.
Click the ⇄ Swap button to exchange the two selected units and flip the conversion direction instantly.

Key Features

8 categories — Length, Weight, Temperature, Area, Volume, Speed, Data Storage, and Time in one tool.
70+ units including metric, imperial, and scientific units across all categories.
Live bidirectional conversion — type in either field; results update instantly with no button click needed.
Swap button — reverse the conversion direction with one click.
Quick-reference chips show popular conversions for each category as handy shortcuts.
Handles very large and very small numbers — shows scientific notation (e.g. 1.23e+15) when needed.
Runs entirely in the browser — fast, offline-capable, and completely private.
Free and no sign-up required — convert as many units as you need.

Supported Unit Categories

Length: Metre, Kilometre, Centimetre, Millimetre, Mile, Yard, Foot, Inch, Nautical Mile, Light Year
Weight/Mass: Kilogram, Gram, Milligram, Pound, Ounce, Metric Ton, Stone, Carat
Temperature: Celsius, Fahrenheit, Kelvin, Rankine
Area: Square Metre, Square Kilometre, Hectare, Acre, Square Foot, Square Inch, Square Mile, Square Yard
Volume: Litre, Millilitre, Cubic Metre, Gallon (US), Quart, Pint, Cup, Fluid Ounce
Speed: Metre/sec, km/h, mph, Knot, Mach, Feet/sec
Data Storage: Bit, Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte (and their bit equivalents)
Time: Millisecond, Second, Minute, Hour, Day, Week, Month, Year, Decade, Century