Free online unit converter covering length, weight, volume, area, speed, time, pressure, energy, power, angle and data storage. Convert instantly, with every unit shown at once.

Unit Converter – Length, Weight, Volume, Speed & More

Convert units effortlessly with this versatile unit converter, covering length, weight, volume, area, speed, time, pressure, energy, power, angle, and storage.

Unit converter: length converter, weight converter, volume converter, metric to imperial converter, convert units online, measurement converter, cm to inches, kg to lbs, mph to kph, data storage converter

Features of Unit Converter

• 11 categories in one tool — Length, Weight/Mass, Volume, Area, Speed, Time, Pressure, Energy, Power, Angle, and Data Storage, switchable from a single dropdown
• Live, bidirectional conversion — type into either the “From” or “To” field and the other updates instantly, with no separate convert button
• Swap with one click — instantly flip which unit is the source and which is the target
• See every unit at once — the “All Units” table shows your current value converted into every unit in that category simultaneously, not just the two you’ve selected
• Click to reassign — click any row in the All Units table to instantly make it the new “To” unit
• Covers both metric and imperial — common conversions like cm to inches, kg to lbs, and mph to km/h are all built in alongside their less common counterparts
• 100% private — every conversion happens locally in your browser; nothing you type is sent anywhere

How to Use the Unit Converter?

1. Choose a category. Select Length, Weight, Volume, Area, Speed, Time, Pressure, Energy, Power, Angle, or Data Storage from the dropdown at the top.
2. Pick your “From” and “To” units. Use the dropdowns in each field to select the units you’re converting between.
3. Type a value. Enter a number into either the “From” or “To” field — the other field updates automatically.
4. Swap units instantly. Click the ⇄ button to reverse which unit is the source and which is the target.
5. Browse every conversion at once. Scroll down to the All Units table to see your value converted into every unit in the current category simultaneously — useful when you’re not sure which exact unit you need.
6. Jump to a different unit fast. Click any row in the All Units table to set it as your new “To” unit without reopening the dropdown.

Tip: Switching categories resets the “From” value to 1, which is a fast way to see the base conversion rate between any two units — for example, selecting Length and leaving the value at 1 instantly shows you that 1 mile equals roughly 1.61 kilometers.