Unit Converter

How Unit Conversion Works

Most unit conversions work by translating a value into a common base unit and then into the target unit. For length, the base is the meter; for weight, the gram; for volume, the liter. Temperature is the exception — Celsius, Fahrenheit, and Kelvin use offset formulas rather than simple ratios, which this converter handles automatically.

Common Conversions at a Glance

• 1 inch = 2.54 cm  |  1 foot = 30.48 cm  |  1 mile = 1.609 km
• 1 kilogram = 2.205 lb  |  1 ounce = 28.35 g
• 1 liter = 33.81 US fl oz  |  1 US gallon = 3.785 L
• 0°C = 32°F = 273.15 K  |  100°C = 212°F
• 1 mile/hour = 1.609 km/h  |  1 m/s = 3.6 km/h

Metric vs. Imperial

Most of the world uses the metric system (meters, grams, liters), built on powers of ten that make conversions simple. The United States primarily uses the imperial / US customary system (feet, pounds, gallons). This converter bridges the two so you can move between them effortlessly, whether you're following a recipe, reading a spec sheet, or planning travel.

Temperature Conversion Formulas

• Celsius to Fahrenheit: °F = (°C × 9/5) + 32
• Fahrenheit to Celsius: °C = (°F − 32) × 5/9
• Celsius to Kelvin: K = °C + 273.15

Frequently Asked Questions

How do I convert units?

Pick a category, enter a value, and choose your "from" and "to" units. The converter instantly calculates the result and shows the conversion as you type.

How many centimeters are in an inch?

There are exactly 2.54 centimeters in one inch. So 10 inches equals 25.4 cm, and 1 foot (12 inches) equals 30.48 cm.

How do I convert Celsius to Fahrenheit?

Multiply the Celsius temperature by 9/5 and add 32. For example, 20°C × 9/5 = 36, plus 32 = 68°F.

What units can I convert here?

This tool converts length, weight/mass, temperature, volume, area, speed, time, and digital data storage, covering both metric and imperial units.