Convert Common Units Easily and Accurately

Quickly convert between different measurement units ( length, volume, weight and temperature )

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How to Use the Unit Converter

Converting units is simple and fast:

  1. Select Category: Choose the type of measurement (length, weight, temperature, etc.)
  2. Enter Value: Input the number you want to convert
  3. Choose From Unit: Select the unit you're converting from
  4. Choose To Unit: Select the unit you want to convert to
  5. View Results: See the converted value instantly
  6. Copy or Reset: Copy the result or clear to make another conversion

Measurement Categories Available

Length Conversions

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and more.

Common Uses: Construction, travel distances, height measurements, fabric lengths

Weight/Mass Conversions

Convert between grams, kilograms, pounds, ounces, tons, milligrams, and more.

Common Uses: Cooking, shipping, body weight, scientific measurements

Temperature Conversions

Convert between Celsius, Fahrenheit, and Kelvin.

Common Uses: Weather, cooking, scientific experiments, travel

Volume Conversions

Convert between liters, milliliters, gallons, cups, tablespoons, teaspoons, fluid ounces, and more.

Common Uses: Cooking, beverages, fuel consumption, chemistry

Area Conversions

Convert between square meters, square feet, acres, hectares, square miles, and more.

Common Uses: Real estate, land measurement, gardening, construction

Speed Conversions

Convert between miles per hour, kilometers per hour, meters per second, knots, and more.

Common Uses: Driving, aviation, athletics, weather reports

Time Conversions

Convert between seconds, minutes, hours, days, weeks, months, years, and more.

Common Uses: Project planning, time zones, age calculations, scheduling

Energy Conversions

Convert between joules, calories, kilocalories, BTU, watt-hours, and more.

Common Uses: Nutrition, physics, heating/cooling systems

Pressure Conversions

Convert between pascals, bar, PSI, atmospheres, and more.

Common Uses: Tire pressure, weather, scuba diving, engineering

Common Conversion Formulas

Temperature Conversions

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

How to convert Celsius to Fahrenheit?

Use: (°C × 9/5) + 32

How to convert Fahrenheit to Celsius?

Use: (°F − 32) × 5/9

How to convert Celsius to Kelvin?

Add 273.15 to Celsius.

How to convert Kelvin to Celsius?

Subtract 273.15 from Kelvin.

Temperature conversion formula

A mathematical equation to change temperature units.

Which temperature scale is correct?

All are correct; they're used for different purposes.

Why temperature conversion is different?

Because temperature scales start at different zero points.

Length Conversions

  • Inches to Centimeters: inches × 2.54 = cm
  • Feet to Meters: feet × 0.3048 = m
  • Miles to Kilometers: miles × 1.60934 = km
  • Meters to Feet: meters × 3.28084 = ft

How to convert meters to feet?

Multiply meters by 3.281 to get feet.

How to convert feet to meters?

Multiply feet by 0.3048 to get meters.

How to convert kilometers to miles?

Multiply kilometers by 0.621.

How to convert miles to kilometers?

Multiply miles by 1.609.

How to convert inches to cm?

Multiply inches by 2.54.

How to convert cm to inches?

Divide centimeters by 2.54.

How to convert yards to meters?

Multiply yards by 0.9144.

How to convert mm to inches?

Divide millimeters by 25.4.

Weight Conversions

  • Pounds to Kilograms: pounds × 0.453592 = kg
  • Ounces to Grams: ounces × 28.3495 = g
  • Kilograms to Pounds: kg × 2.20462 = lbs

How to convert kg to pounds?

Multiply kilograms by 2.205.

How to convert pounds to kg?

Divide pounds by 2.205.

How to convert grams to ounces?

Multiply grams by 0.0353.

How to convert ounces to grams?

Multiply ounces by 28.35.

How to convert tons to kg?

Multiply tons by 1000.

How to convert mg to grams?

Divide milligrams by 1000.

Volume Conversions

  • Gallons to Liters: gallons × 3.78541 = L
  • Cups to Milliliters: cups × 236.588 = mL
  • Tablespoons to Milliliters: tbsp × 14.7868 = mL
  • Liters to Gallons: liters × 0.264172 = gal

How to convert liters to gallons?

Multiply liters by 0.264.

How to convert gallons to liters?

Multiply gallons by 3.785.

How to convert ml to liters?

Divide milliliters by 1000.

How to convert cubic meters to liters?

Multiply by 1000.

How to convert cups to ml?

1 cup ≈ 240 ml.

How to convert pints to liters?

Multiply pints by 0.473.

Area Conversions

  • Square Feet to Square Meters: sq ft × 0.092903 = m²
  • Square Meters to Square Feet: m² × 10.7639 = sq ft
  • Acres to Square Feet: acres × 43,560 = sq ft
  • Square Feet to Acres: sq ft × 0.00002296 = acres
  • Hectares to Acres: hectares × 2.47105 = acres
  • Acres to Hectares: acres × 0.404686 = hectares
  • Marla to Square Feet: marla × 272.25 = sq ft
  • Kanal to Marla: kanal × 20 = marla

How to convert square feet to square meters?

Multiply by 0.0929.

How to convert square meters to square feet?

Multiply by 10.764.

How to convert acres to square feet?

Multiply acres by 43,560.

How to convert hectares to acres?

Multiply hectares by 2.471.

How to convert marla to square feet?

1 marla ≈ 272.25 sq ft.

How to convert kanal to marla?

1 kanal = 20 marla.

Practical Conversion Examples

Cooking and Baking

  • 1 cup = 236.59 mL ≈ 240 mL
  • 1 tablespoon = 14.79 mL ≈ 15 mL
  • 1 teaspoon = 4.93 mL ≈ 5 mL
  • 1 pound = 453.59 grams
  • 350°F = 177°C (common baking temperature)

Travel and Distance

  • Highway speed: 65 mph = 105 km/h
  • Marathon: 26.2 miles = 42.2 km
  • Short drive: 10 miles = 16.1 km
  • Fuel efficiency: 30 mpg = 12.8 km/L

Body Measurements

  • Average height: 5'9" = 175 cm
  • Weight: 150 lbs = 68 kg
  • Normal body temp: 98.6°F = 37°C
  • Fever: 100.4°F = 38°C

Home and Construction

  • Room size: 12×15 feet = 3.66×4.57 meters
  • Land plot: 1 acre = 4,047 m² ≈ 0.4 hectares
  • Paint: 1 gallon covers ≈ 37 m² (400 sq ft)
  • Lumber: 2×4 inches = 5.08×10.16 cm

Industry-Specific Conversions

Construction and Engineering

Aviation

Medicine and Healthcare

Fitness and Nutrition

Real Estate

Metric vs. Imperial Systems

Metric System (SI Units)

Used by: Nearly every country worldwide

Base Units: Meter (length), kilogram (mass), second (time), liter (volume)

Advantages: Decimal-based, easy conversions (everything is multiples of 10)

Common in: Science, medicine, international trade

Imperial System

Used by: United States, Myanmar, Liberia

Base Units: Foot, pound, second, gallon

Advantages: Familiar to US residents

Challenges: Complex conversions (12 inches = 1 foot, 3 feet = 1 yard, etc.)

Why Conversion Matters

Frequently Asked Questions (FAQs)

What is a unit converter?

A unit converter is a tool or calculator that transforms measurements from one unit system to another, ensuring accurate conversions across different standards. It helps convert length, weight, temperature, volume, speed, and other quantities between metric, imperial, and other measurement systems. For example, converting 5 kilometers to miles using a unit converter shows 3.11 miles, or converting 100 degrees Fahrenheit to Celsius shows 37.8°C. Online unit converters, mobile apps, and conversion formulas make these calculations instant and error-free for everyday and professional use.

Is unit conversion universal?

Unit conversion follows universal mathematical relationships and standardized conversion factors recognized internationally, making conversions consistent worldwide. Organizations like the International System of Units (SI) establish standard conversion ratios that remain constant regardless of location. For example, 1 inch always equals 2.54 centimeters everywhere, and 1 kilogram equals 2.20462 pounds universally. However, different countries prefer different measurement systems—the US uses imperial (miles, pounds), while most countries use metric (kilometers, kilograms)—though the conversion factors between them remain universally standardized.

How to convert meters to feet?

Multiply the number of meters by 3.28084 to convert to feet, as 1 meter equals approximately 3.28084 feet. For quick estimates, multiply by 3.3 for rough calculations without a calculator. For example, 10 meters × 3.28084 = 32.8084 feet, or 50 meters = 164.04 feet. Conversely, to convert feet to meters, divide by 3.28084 or multiply by 0.3048 (since 1 foot = 0.3048 meters). This conversion is essential in construction, sports, real estate, and international travel contexts.

How metric and imperial units differ?

The metric system uses base-10 increments (kilometers, meters, centimeters) making calculations simple, while imperial uses irregular conversions (12 inches per foot, 5,280 feet per mile). Metric is used by most countries worldwide and in scientific contexts, whereas imperial remains common in the United States, UK (partially), and some industries. For example, metric: 1 kilometer = 1,000 meters = 100,000 centimeters; imperial: 1 mile = 1,760 yards = 5,280 feet = 63,360 inches. Metric's decimal-based system simplifies conversions and reduces errors, while imperial's historical roots create more complex but familiar measurements for certain populations.

Can I convert between metric and imperial units?

Absolutely! One of the primary functions of our converter is to bridge metric and imperial systems. Convert seamlessly between kilometers and miles, kilograms and pounds, liters and gallons, and more.

What's the difference between weight and mass?

Mass is the amount of matter in an object (constant everywhere). Weight is the force of gravity on that mass (varies by location). For everyday purposes, the terms are used interchangeably, and our converter handles both.

Why are there different gallon measurements?

There are two types: US gallons (3.785 liters) and UK/Imperial gallons (4.546 liters). Always specify which you're using. Our converter defaults to US gallons but can handle both.

How do I convert cooking measurements?

Select the volume category for liquids (cups, tablespoons, milliliters) or weight category for dry ingredients (grams, ounces). Note: volume-to-weight conversions for ingredients vary by density.

Can I convert square feet to cubic feet?

No, these measure different dimensions. Square feet measures area (2D), while cubic feet measures volume (3D). You need additional information (like height) to convert between them.

What's the difference between Celsius and Fahrenheit?

Celsius (metric) uses water's freezing (0°) and boiling (100°) points. Fahrenheit (imperial) uses 32° for freezing and 212° for boiling. Celsius is used globally; Fahrenheit primarily in the US.

How do I convert speeds for international driving?

Use our speed converter: 100 km/h ≈ 62 mph. Remember this when traveling—speed limits in Europe are typically in km/h, while US uses mph.

Why do I need to convert units?

Different countries and industries use different measurement systems. Conversion ensures accurate communication, prevents costly errors, and helps you understand measurements in unfamiliar systems.

Can I convert between time zones?

Our time converter handles duration (hours to minutes), not time zones. For time zone conversion, you need a different tool that accounts for geographic locations.

How do I convert recipe measurements?

For liquids, use volume conversions. For dry ingredients, weight conversions are more accurate (250g flour ≠ 250mL flour). Professional bakers prefer weight measurements.

What's a BTU and when do I use it?

BTU (British Thermal Unit) measures energy/heat. It's commonly used for air conditioner and heater capacity. 1 BTU ≈ 1,055 joules or 0.293 watt-hours.

Can I convert between acres and square miles?

Yes! Both measure area. 1 square mile = 640 acres. Use our area converter for instant conversion between all area units.

How do I convert tire pressure?

Tire pressure is commonly measured in PSI (pounds per square inch), bar, or kPa (kilopascals). Use our pressure converter: 30 PSI ≈ 2.07 bar ≈ 207 kPa.

What's the difference between MB and MiB?

MB (megabyte) = 1,000,000 bytes (decimal). MiB (mebibyte) = 1,048,576 bytes (binary). Computers use binary, but storage manufacturers often use decimal, causing confusion.