Unit Conversion Calculator

Quick, accurate, and modern unit conversions for length, weight, temperature, and volume

Free Online Unit Converter - Convert Any Measurement Instantly

Our comprehensive unit converter helps you quickly convert between different measurement systems used worldwide. Whether you need to convert pounds to kg for international shipping, mm to inches for precise engineering work, or celsius to fahrenheit for cooking, our calculator provides accurate results instantly.

Perfect for students, professionals, travelers, and anyone working with measurements across metric and imperial systems. All conversions are calculated using precise mathematical formulas and international standards.

📏 Length Converter

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⚖️ Weight Converter

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🌡️ Temperature Converter

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🥤 Volume Converter

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Popular Conversions

1 cm to inches
= 0.394 inches
▼
Formula: inches = centimeters × 0.393701
Explanation: Centimeters to inches conversion is commonly used when converting between metric and imperial measurements for height, screen sizes, and fabric measurements.
History: The inch was originally defined as the width of a man's thumb, while the centimeter comes from the French metric system established in 1795.
1 pound to kg
= 0.454 kg
▼
Formula: kilograms = pounds × 0.453592
Explanation: Pounds to kilograms is essential for international shipping, fitness tracking, and cooking when following recipes from different countries.
History: The pound originated from the Roman libra, while the kilogram was defined in 1795 as the mass of one liter of water at maximum density.
1 mile to km
= 1.609 km
▼
Formula: kilometers = miles × 1.609344
Explanation: Miles to kilometers conversion is crucial for travel, GPS navigation, and understanding distances when traveling between countries using different measurement systems.
History: The mile comes from the Roman "mille passus" (thousand paces), while the kilometer was established as part of the metric system during the French Revolution.
1 kg to pounds
= 2.205 pounds
▼
Formula: pounds = kilograms × 2.20462
Explanation: Kilograms to pounds conversion is widely used in fitness, medicine, and commerce, especially when dealing with body weight and package shipping.
History: The kilogram is the only SI base unit still defined by a physical artifact (until 2019), while pounds have varied throughout history before standardization.
1 mm to inches
= 0.039 inches
▼
Formula: inches = millimeters × 0.0393701
Explanation: Millimeters to inches is essential in engineering, manufacturing, and crafting where precise measurements are critical for proper fit and function.
History: The millimeter was introduced with the metric system in 1795, representing 1/1000 of a meter, making it ideal for precise measurements.
0°C to Fahrenheit
= 32°F
▼
Formula: °F = (°C × 9/5) + 32
Explanation: Celsius to Fahrenheit conversion is vital for weather understanding, cooking, and scientific applications when working across different temperature scales.
History: Celsius was created by Anders Celsius in 1742, while Fahrenheit was developed by Daniel Gabriel Fahrenheit in 1724, each using different reference points.

Complete Guide to Unit Conversions

📏 Length Conversions

Convert between metric and imperial length measurements with precision. Our length converter handles everything from millimeters to miles, making it perfect for:

  • MM to Inches: Essential for engineering, manufacturing, and detailed technical work
  • CM to Inches: Common for height measurements, screen sizes, and international specifications
  • Meters to Feet: Useful for construction, room measurements, and real estate
  • Miles to Kilometers: Critical for travel planning, GPS navigation, and distance calculations

The metric system, based on powers of 10, offers simplicity and precision, while imperial measurements remain standard in the United States for many applications.

⚖️ Weight Conversions

Accurate weight conversions are essential for international commerce, health tracking, and cooking. Our weight converter provides precise results for:

  • Pounds to KG: Vital for shipping, luggage restrictions, and fitness tracking
  • KG to Pounds: Important for understanding body weight in different countries
  • Ounces to Grams: Perfect for cooking, baking, and portion control
  • Stones to Pounds: Traditional UK weight measurement still used today

Weight conversions become crucial when traveling internationally, as different countries use different systems for everything from personal weight to package shipping limits.

🌡️ Temperature Conversions

Temperature conversion is essential for weather understanding, cooking, and scientific applications. Our calculator converts between:

  • Celsius to Fahrenheit: Essential for Americans traveling abroad or following international recipes
  • Fahrenheit to Celsius: Important for understanding weather forecasts and scientific data
  • Kelvin Conversions: Critical for scientific calculations and absolute temperature measurements

Understanding temperature scales helps in cooking (especially baking), weather interpretation, and scientific work where precise temperature control is critical.

🥤 Volume Conversions

Volume conversions are indispensable for cooking, chemistry, and liquid measurements. Convert between:

  • Liters to Gallons: Important for fuel economy, large liquid purchases
  • Milliliters to Fluid Ounces: Essential for cooking and medicine dosing
  • Cups to Milliliters: Critical when following international recipes
  • Quarts to Liters: Useful for automotive fluids and large quantity cooking

Accurate volume conversion ensures recipe success, proper medication dosing, and correct understanding of liquid quantities across different measurement systems.

Most Searched Unit Conversions

Everyday Length Conversions

5 feet = 152.4 centimeters
1 meter = 39.37 inches
6 feet = 1.83 meters
100 mm = 3.94 inches

Common Weight Conversions

150 pounds = 68.0 kg
70 kg = 154.3 pounds
500 grams = 1.1 pounds
2 pounds = 907 grams

Travel Distance Conversions

100 miles = 160.9 kilometers
50 km = 31.1 miles
1000 miles = 1609 kilometers
200 km = 124.3 miles

Kitchen Temperature Conversions

350°F = 177°C (baking)
100°C = 212°F (boiling)
25°C = 77°F (room temp)
0°C = 32°F (freezing)
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