Unit Converter
Our unit converter lets you convert between the most commonly used units across 4 categories: length (meters, kilometers, miles, feet), weight (kilograms, pounds, ounces), temperature (Celsius, Fahrenheit, Kelvin), and volume (liters, gallons, milliliters). All conversions are performed instantly with precise formulas. Reference tables include the most common conversions between metric and imperial systems.
Frequently Asked Questions
What is the difference between the metric and imperial systems?
The metric system (meters, kilograms, liters) is the international standard used in most countries, including Mexico and Spain. It's based on powers of 10, making conversions simple. The imperial system (feet, pounds, gallons) is primarily used in the United States. Key equivalences: 1 meter = 3.281 feet, 1 kilogram = 2.205 pounds, and 1 liter = 0.264 gallons.
How do you convert Celsius to Fahrenheit?
To convert from Celsius to Fahrenheit, use the formula: °F = (°C × 9/5) + 32. For example, 20°C = (20 × 9/5) + 32 = 68°F. For the reverse conversion: °C = (°F − 32) × 5/9. Useful reference points: 0°C = 32°F (water freezing), 37°C = 98.6°F (body temperature), 100°C = 212°F (water boiling).
How many pounds are in a kilogram?
One kilogram equals exactly 2.20462 pounds. For a quick estimate, multiply kilograms by 2.2. For example: 70 kg × 2.2 = 154 pounds. In reverse, one pound equals 0.4536 kilograms, so you can divide pounds by 2.2 to get approximate kilograms.
How many liters are in a gallon?
One US gallon equals 3.785 liters. It's important to distinguish between the US gallon and the British imperial gallon, which is larger: 4.546 liters. This converter uses the US gallon, which is most common in the Americas. Quick reference: 1 gallon ≈ 3.8 liters, or 1 liter ≈ 0.264 gallons.
What is the Kelvin scale and what is it used for?
The Kelvin scale is the absolute temperature scale used in science and engineering. Its zero point (0 K = −273.15°C) is absolute zero, the lowest temperature theoretically possible where all molecular motion ceases. To convert: K = °C + 273.15. The Kelvin scale uses the same intervals as Celsius, only the reference point changes. It's essential in thermodynamics, chemistry, and physics.