Unit Converter

Convert between length, area, weight, temperature, volume, and speed units instantly. Free online unit converter with advanced features, calculation history, and comprehensive unit analysis. Complete measurement conversion tool for professionals and students.

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Conversion Results

Input Value

Original Value

From Unit

Inches

Source Unit

Result

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To Unit

Feet

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How to Use Our Unit Converter

Select Conversion Type: Choose the type of conversion you need from the tabs (Length, Area, Weight, Temperature, Volume, or Speed)
Enter Value: Input the numerical value you want to convert in the provided field
Select Units: Choose the unit to convert from and the unit to convert to from the dropdown menus
Convert: Click "Convert" button to see the converted value with high accuracy
Swap Units: Use "Swap Units" button to instantly reverse your conversion
Copy Results: Use "Copy Results" to copy conversions to clipboard
Calculation History: Track your recent unit conversions for quick reference
Reset Tool: Use "Reset" button to clear all fields and history

Metric vs Imperial Systems: Comprehensive Comparison

Key Conversion Formulas:

Length: 1 meter = 3.28084 feet, 1 foot = 0.3048 meters

Weight: 1 kilogram = 2.20462 pounds, 1 pound = 0.453592 kilograms

Temperature: °F = (°C × 9/5) + 32, °C = (°F - 32) × 5/9

Volume: 1 liter = 0.264172 gallons, 1 gallon = 3.78541 liters

Area: 1 hectare = 2.47105 acres, 1 acre = 0.404686 hectares

Speed: 1 km/h = 0.621371 mph, 1 mph = 1.60934 km/h

Measurement Type	Metric System	Imperial System	Primary Use
Length	Millimeters, Centimeters, Meters, Kilometers	Inches, Feet, Yards, Miles	Scientific, Engineering, Everyday
Weight/Mass	Grams, Kilograms, Metric Tons	Ounces, Pounds, Stones, Tons	Science, Commerce, Daily Use
Temperature	Celsius (°C), Kelvin (K)	Fahrenheit (°F)	Weather, Science, Cooking
Volume	Milliliters, Liters, Cubic Meters	Fluid Ounces, Pints, Quarts, Gallons	Cooking, Science, Industry
Area	Square Meters, Hectares	Square Feet, Acres	Real Estate, Agriculture
Speed	km/h, m/s	mph, ft/s	Transportation, Sports

Historical Context: The metric system (International System of Units - SI) is used by most countries worldwide, while the imperial system is primarily used in the United States, Liberia, and Myanmar. The metric system is based on powers of 10, making calculations simpler.

Length Conversion Formulas and Applications

Length conversions are among the most common unit conversions. Here are the key mathematical formulas and practical applications:

Length Conversion Formulas:

Meters to Feet: feet = meters × 3.28084

Feet to Meters: meters = feet × 0.3048

Kilometers to Miles: miles = kilometers × 0.621371

Miles to Kilometers: kilometers = miles × 1.60934

Centimeters to Inches: inches = centimeters × 0.393701

Inches to Centimeters: centimeters = inches × 2.54

Construction and Real Estate

Essential for converting architectural plans between metric and imperial systems, calculating material quantities, and understanding international property measurements.

Travel and Navigation

Convert distances between kilometers and miles for road trips, hiking trails, and international travel planning.

Science and Engineering

Precise conversions between millimeters, centimeters, meters, and their imperial equivalents for technical drawings and scientific measurements.

Temperature Conversion: Formulas and Scientific Basis

Temperature conversions require specific mathematical formulas rather than simple multiplication factors:

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

Kelvin to Celsius: °C = K - 273.15

Fahrenheit to Kelvin: K = (°F - 32) × 5/9 + 273.15

Kelvin to Fahrenheit: °F = (K - 273.15) × 9/5 + 32

Temperature	Celsius (°C)	Fahrenheit (°F)	Kelvin (K)	Common Use
Absolute Zero	-273.15°C	-459.67°F	0 K	Theoretical minimum temperature
Water Freezes	0°C	32°F	273.15 K	Weather, Science
Room Temperature	20°C	68°F	293.15 K	Comfort settings
Body Temperature	37°C	98.6°F	310.15 K	Medical
Water Boils	100°C	212°F	373.15 K	Cooking, Science

Scientific Insight: Kelvin is the SI base unit for temperature and is used in scientific contexts because it starts at absolute zero. Celsius and Fahrenheit are relative scales based on the freezing and boiling points of water.

Weight and Volume Conversions for Cooking and Science

Weight and volume conversions are particularly important for cooking, baking, and scientific measurements:

Common Cooking Conversions:

Weight: 1 ounce = 28.3495 grams, 1 pound = 453.592 grams

Volume: 1 cup = 236.588 mL, 1 tablespoon = 14.7868 mL

Liquid: 1 fluid ounce = 29.5735 mL, 1 gallon = 3.78541 liters

Dry: 1 pint = 550.610 mL, 1 quart = 1.10122 liters

Cooking and Baking

Convert recipes between metric and imperial measurements, ensuring accurate ingredient proportions for international recipes.

Medical and Pharmaceutical

Precise conversions between milligrams, grams, milliliters, and liters for medication dosages and pharmaceutical preparations.

Industrial Applications

Convert between different weight and volume units for manufacturing, shipping, and material calculations in global supply chains.

Cooking Tip: When converting recipes, note that weight measurements (grams, ounces) are more accurate than volume measurements (cups, tablespoons) for dry ingredients like flour and sugar.

Speed and Area Conversions for Practical Applications

Speed and area conversions are essential for transportation, sports, real estate, and agriculture:

Speed Conversion Formulas:

km/h to mph: mph = km/h × 0.621371

mph to km/h: km/h = mph × 1.60934

m/s to mph: mph = m/s × 2.23694

knots to km/h: km/h = knots × 1.852

Area Conversion Formulas:

Square meters to square feet: ft² = m² × 10.7639

Square feet to square meters: m² = ft² × 0.092903

Acres to hectares: hectares = acres × 0.404686

Hectares to acres: acres = hectares × 2.47105

Application	Common Units	Typical Conversions	Precision Needed
Automotive	km/h, mph	Speed limits, car specifications	Medium (1-2 decimal places)
Aviation	knots, km/h	Airspeed, wind speed	High (2-3 decimal places)
Real Estate	m², ft²	Property area, room sizes	Medium (whole numbers)
Agriculture	acres, hectares	Land area, crop yields	Medium (2 decimal places)
Sports	m/s, mph	Athlete speeds, record times	High (3 decimal places)

Why Use Our Unit Converter?

Six Conversion Categories

Convert between length, area, weight, temperature, volume, and speed units all in one tool.

Calculation History

Track your recent conversions with timestamps for quick reference and re-use.

Metric & Imperial

Seamless conversion between metric and imperial systems with precise formulas.

Frequently Asked Questions

What types of units can I convert with this tool?

Our unit converter supports six main categories: Length (meters, feet, inches), Area (square meters, acres), Weight (kilograms, pounds), Temperature (Celsius, Fahrenheit, Kelvin), Volume (liters, gallons), and Speed (km/h, mph, knots). Each category includes both metric and imperial units.

How accurate are the unit conversions?

All conversions use standard, internationally recognized conversion factors. Temperature conversions use precise mathematical formulas, and all calculations maintain up to 6 decimal places for accuracy.

Can I convert between metric and imperial systems?

Yes, our converter seamlessly handles conversions between metric and imperial systems. You can convert meters to feet, kilograms to pounds, liters to gallons, Celsius to Fahrenheit, and any combination between these measurement systems.

Is this unit converter free to use?

Yes, our unit converter is completely free with no limitations. No registration required and no hidden fees. You can perform unlimited conversions across all unit categories.

How do temperature conversions work?

Temperature conversions use precise formulas: Celsius to Fahrenheit: (°C × 9/5) + 32, Fahrenheit to Celsius: (°F - 32) × 5/9, Celsius to Kelvin: °C + 273.15, Kelvin to Celsius: K - 273.15. Our converter applies these formulas accurately.

Can I convert cooking measurements?

Yes, our volume converter includes cooking units like cups, tablespoons, teaspoons, fluid ounces, pints, quarts, and gallons. Perfect for converting recipes between different measurement systems.

Do you store my conversion data?

No, we don't store any of your conversion data. All calculations happen locally in your browser. The calculation history is stored temporarily in your browser's local storage and is never transmitted to our servers.

Is there a limit to how many conversions I can perform?

No, there are no limits to how many conversions you can perform. Our unit converter is completely free to use with unlimited calculations.

Comprehensive Unit Analysis with Advanced Features

Our free online Unit Converter provides comprehensive measurement conversion with advanced features:

Precise Mathematical Formulas

All conversions use standard mathematical formulas and conversion factors recognized internationally for maximum accuracy.

Calculation History Tracking

Track your recent conversions with timestamps for quick reference and re-use in ongoing projects or calculations.

Instant Unit Swapping

Quickly swap between source and target units with one click for reverse calculations and comparative analysis.

This tool is perfect for students working on science and math assignments, engineers working with technical specifications, cooks converting international recipes, travelers planning trips, and professionals working with global measurement systems.

With support for all major unit categories and both metric and imperial systems, you can handle virtually any unit conversion need. The intuitive interface makes it easy to use for both simple conversions and complex measurement analysis.