Unit Converter
Choose a category below to start converting. All conversions happen instantly in your browser — no sign-up, no server calls.
Choose a Category
Length
9 units available
mm · cm · m · km · in · ft…
Weight & Mass
7 units available
mg · g · kg · t · oz · lb…
Area
7 units available
m² · km² · ft² · yd² · mi² · ac…
Volume
9 units available
mL · L · m³ · tsp · tbsp · cup…
Temperature
3 units available
°C · °F · K…
Speed
4 units available
km/h · mph · m/s · kn…
Time
8 units available
ms · s · min · h · d · wk…
Digital Storage
7 units available
bit · B · KB · MB · GB · TB…
Energy
8 units available
J · kJ · cal · kcal · Wh · kWh…
Pressure
8 units available
Pa · kPa · MPa · bar · mbar · psi…
Frequently Asked Questions
How do I use the unit converter?
Select a category (e.g., Length, Weight, Temperature) from the grid above. On the converter page, choose your "from" and "to" units from the dropdowns, then enter the value you want to convert. The result is calculated instantly in your browser. You can swap units using the swap button or clear to start over.
What's the difference between metric and imperial measurements?
Metric (SI) is the international standard using base-10 units: meters, kilograms, liters, Celsius. Imperial (US Customary) uses units like feet, pounds, gallons, Fahrenheit. Most countries use metric, but the US primarily uses imperial. Our converter handles both systems seamlessly— for example, 1 inch = 2.54 cm, 1 pound = 0.453592 kg, 32°F = 0°C.
What are the most common unit conversions?
The most searched conversions are: cm to inches (1 cm = 0.393701 in), kg to lbs (1 kg = 2.20462 lbs), Celsius to Fahrenheit (°C × 9/5 + 32 = °F), miles to km (1 mi = 1.60934 km), liters to gallons (1 L = 0.264172 gal), and feet to meters (1 ft = 0.3048 m). Our Popular Conversions section highlights these frequently used conversions.
How accurate is the unit converter?
Our converter uses industry-standard conversion factors defined by international standards bodies (NIST, BIPM). Results are calculated with double-precision floating-point arithmetic and displayed to an appropriate number of significant figures. For scientific or engineering work requiring extreme precision, verify critical conversions with authoritative references.
What are best practices for unit conversions?
Always double-check your source and target units before converting. Round results appropriately—don't use false precision (e.g., "5 feet = 1.524 meters" is more appropriate than "1.52400000000"). For scientific work, carry extra precision through calculations and round only at the end. Use our tool to verify manual conversions and catch common errors like confusing mass (kg) with weight (newtons).
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