Unit Converter

Convert between units of length, weight, volume, temperature, and more with precise calculations.

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Quick Conversions

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How to Use Unit Converter

How to Use the Unit Converter

  1. Select category: Choose the measurement type (length, weight, temperature, etc.).
  2. Select "from" unit: Choose the unit you want to convert from.
  3. Select "to" unit: Choose the unit you want to convert to.
  4. Enter value: Type the number you want to convert.
  5. View result: The converted value appears instantly.
  6. Swap units: Click the swap button to reverse the conversion.

Quick Reference - Common Conversions

  • 1 inch = 2.54 centimeters
  • 1 foot = 0.3048 meters
  • 1 mile = 1.609 kilometers
  • 1 pound = 0.454 kilograms
  • 1 gallon (US) = 3.785 liters
  • °F = (°C × 9/5) + 32
  • 1 acre = 4,047 square meters
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Features

  • 10+ measurement categories
  • Hundreds of unit types
  • High precision results
  • Instant conversion
  • Swap units button
  • Common conversion shortcuts
  • Scientific notation for large/small numbers
  • Formula display option
  • Recent conversions history
  • Mobile-friendly interface
  • Works offline
  • No registration required
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About Unit Converter

The world uses multiple measurement systems, and converting between them is a constant need for international work, travel, cooking, and technical applications. Our Universal Unit Converter handles all common conversions with precision.

Supported Categories

  • Length: Meters, feet, inches, kilometers, miles, yards, and more
  • Weight/Mass: Kilograms, pounds, ounces, grams, stones, tons
  • Volume: Liters, gallons, cups, tablespoons, milliliters, fluid ounces
  • Temperature: Celsius, Fahrenheit, Kelvin
  • Area: Square meters, square feet, acres, hectares
  • Speed: Km/h, mph, m/s, knots

Precision Matters

Some conversions are exact (1 inch = 2.54 cm by definition), while others are approximations. We use official conversion factors and show appropriate decimal precision. Scientific applications may require more precision than casual conversions.

Practical Applications

Recipes from different countries need volume and temperature conversion. International shipping requires weight and dimension conversions. Travel involves distance and speed conversions. Our tool centralizes all these needs in one place.

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Frequently Asked Questions

What types of units can I convert?
Our converter handles: Length (meters, feet, inches, miles, km), Weight (kg, pounds, ounces, grams), Volume (liters, gallons, cups, ml), Temperature (Celsius, Fahrenheit, Kelvin), Area (sq meters, sq feet, acres, hectares), Speed, Time, Digital Storage (bytes, KB, MB, GB, TB), and more.
How accurate are the conversions?
Our conversions use precise mathematical ratios to at least 10 decimal places internally, then display results with appropriate precision. For scientific work, all conversions follow SI standards. Common conversions like miles-to-kilometers use exact internationally agreed values.
What is the difference between metric and imperial units?
Metric (SI) uses base-10 relationships (1 km = 1000 m). Imperial/US customary uses varied ratios (1 mile = 5280 feet). Metric is used worldwide for science and in most countries. Imperial is common in the US and UK for everyday use. Our tool converts seamlessly between systems.
Why are there different gallon sizes?
US gallon (3.785 L) and Imperial gallon (4.546 L) are different historical standards. The US uses its gallon for fuel and liquids; the UK officially uses metric but Imperial gallons persist. Always verify which gallon is meant - our tool clearly labels both and converts accurately.
How do I convert temperatures accurately?
Temperature conversions aren't simple ratios: C to F = (C × 9/5) + 32. Our tool handles this automatically. Key reference points: water freezes at 0°C/32°F, boils at 100°C/212°F. Kelvin adds 273.15 to Celsius (absolute zero = 0 K = -273.15°C). Enter any temperature and get instant conversion.
Can I convert multiple values at once?
Yes! Enter a list of values (one per line or comma-separated) and convert them all simultaneously. You can also create custom conversion tables showing multiple units at once - useful for reference charts, comparisons, or educational materials.