Unit Converter - Convert Between All Measurement Units
What is a Unit Converter?
A unit converter is a free online tool that allows you to convert measurements between different units across various categories including length, weight, temperature, volume, area, speed, time, and more. Whether you're a student working on homework, a professional handling international measurements, or someone following a recipe from another country, our unit converter provides instant and accurate conversions for all your measurement needs.
How to Use the Unit Converter
Converting units is simple and fast:
- Select Category: Choose the type of measurement (length, weight, temperature, etc.)
- Enter Value: Input the number you want to convert
- Choose From Unit: Select the unit you're converting from
- Choose To Unit: Select the unit you want to convert to
- View Results: See the converted value instantly
- 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
Digital Storage Conversions
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and more.
Common Uses: Computer storage, file sizes, data plans, memory
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
Why Use a Unit Converter?
International Communication
Work seamlessly with measurements from different countries. Convert metric to imperial and vice versa instantly.
Academic Success
Solve homework problems, complete lab assignments, and understand scientific papers that use different measurement systems.
Professional Accuracy
Ensure precision in engineering, construction, medicine, and other fields where measurement errors can be costly.
Cooking and Baking
Follow recipes from around the world by converting between cups, grams, ounces, and milliliters accurately.
Travel Planning
Understand speed limits, distances, temperatures, and fuel measurements when traveling internationally.
Online Shopping
Convert sizes, weights, and dimensions when purchasing from international sellers.
Fitness Tracking
Convert between pounds and kilograms, miles and kilometers for workout and diet tracking.
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
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
Weight Conversions
- Pounds to Kilograms: pounds × 0.453592 = kg
- Ounces to Grams: ounces × 28.3495 = g
- Kilograms to Pounds: kg × 2.20462 = lbs
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
Frequently Asked Questions (FAQs)
How accurate is the unit converter?
Our unit converter uses precise conversion factors and provides accuracy to multiple decimal places. For most practical purposes, the results are accurate enough for professional, academic, and personal use.
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.
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
- Global business: International trade requires understanding both systems
- Travel: Speed limits, fuel, distances vary by country
- Science: Research uses metric; understanding conversions is essential
- Online shopping: Product specifications may use unfamiliar units
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
- Board feet calculations
- Concrete measurements (cubic yards)
- Rebar spacing (inches to millimeters)
- Structural load (PSI, MPa)
Aviation
- Altitude (feet to meters)
- Speed (knots to mph/km/h)
- Fuel (pounds to gallons)
- Visibility (statute miles to meters)
Medicine and Healthcare
- Medication dosages (mg/kg)
- Body temperature
- Blood pressure (mmHg)
- Lab results (various units)
Fitness and Nutrition
- Body weight tracking
- Running distances
- Calorie energy values
- Supplement dosages
Real Estate
- Property area (acres, hectares)
- Room dimensions
- Lot sizes
- Square footage
Educational Applications
Science Classes
Convert units for physics problems, chemistry calculations, and biology experiments. Understanding conversions is fundamental to scientific literacy.
Math Education
Unit conversion teaches proportional reasoning, multiplication, division, and working with decimals—essential mathematical skills.
Geography
Understand map scales, distances between cities, and elevation differences using appropriate units.
Home Economics
Learn cooking measurements, fabric quantities, and household product amounts through practical conversion exercises.
