Unit Converter

What is Unit Conversion?

Unit conversion is the process of transforming a measurement from one unit to another while maintaining the same quantity. Whether you're converting meters to feet, kilograms to pounds, Celsius to Fahrenheit, or liters to gallons, unit conversion ensures accurate communication and understanding across different measurement systems. Unit converters are essential tools for students solving math and science problems, engineers working with technical specifications, travelers navigating foreign countries, cooks following international recipes, fitness enthusiasts tracking workouts, and professionals in construction, healthcare, manufacturing, and countless other fields.

Our free unit converter supports instant conversions across eight major categories: length (distance measurements), weight (mass measurements), temperature (heat measurements), volume (capacity measurements), area (surface measurements), speed (velocity measurements), time (duration measurements), and digital storage (data size measurements). With support for metric units, imperial units, and international standards, our converter handles conversions between meters, feet, kilometers, miles, grams, pounds, ounces, Celsius, Fahrenheit, Kelvin, liters, gallons, square meters, acres, kilometers per hour, miles per hour, and dozens more units across all categories.

Why Use a Unit Converter?

Unit converters eliminate manual calculation errors and save time when working with different measurement systems. Students benefit from quick homework help and exam preparation. Engineers require accurate conversions for technical specifications and safety compliance. International travelers need currency and distance conversions for navigation and shopping. Cooks convert recipe measurements between metric and imperial systems. Fitness enthusiasts track distance, speed, and weight across different units. Professionals in construction, healthcare, manufacturing, logistics, and science rely on unit converters daily for accuracy and efficiency in their work.

Length & Distance Conversions

Length conversion is one of the most common unit conversions, essential for measuring distances, heights, dimensions, and spatial measurements. Our length converter supports conversions between metric units (millimeters, centimeters, meters, kilometers), imperial units (inches, feet, yards, miles), and specialized units (nautical miles, light-years) used in navigation, astronomy, construction, real estate, travel, mapping, and everyday measurements.

Common Length Units

• Millimeter (mm): 1/1000 of a meter—used for precise small measurements in engineering, manufacturing, jewelry, and technical drawings.
• Centimeter (cm): 1/100 of a meter—common for body measurements, fabric lengths, screen sizes, and small object dimensions.
• Meter (m): Base SI unit of length—standard for room dimensions, swimming pool lengths, building heights, and general measurements.
• Kilometer (km): 1,000 meters—used for road distances, city planning, running/cycling distances, and geographic measurements.
• Inch (in): 1/12 of a foot—common in US for screen sizes, pipe diameters, lumber dimensions, and everyday measurements.
• Foot (ft): 12 inches—standard US unit for building heights, room dimensions, altitude, and human height measurements.
• Yard (yd): 3 feet—used in US for fabric, sports fields (American football), gardening, and landscaping measurements.
• Mile (mi): 5,280 feet—primary US unit for road distances, travel planning, marathon distances, and geographic measurements.
• Nautical Mile: 1,852 meters—used in maritime and aviation for navigation, shipping routes, and international air travel.

Practical Length Conversion Examples

Weight & Mass Conversions

Weight conversion is essential for cooking, fitness tracking, shipping, scientific measurements, healthcare, and international commerce. Our weight converter handles conversions between metric units (milligrams, grams, kilograms, metric tons), imperial units (ounces, pounds, stones, US tons), and specialized units used in jewelry (carats), pharmacy (grains), and precious metals (troy ounces).

Common Weight Units

• Milligram (mg): 1/1000 of a gram—used for medications, vitamins, nutritional labels, and precise scientific measurements.
• Gram (g): Base metric unit—common for food ingredients, small packages, jewelry, precious metals, and everyday items.
• Kilogram (kg): 1,000 grams—standard for body weight, luggage, packages, produce, and general weight measurements worldwide.
• Metric Ton (tonne): 1,000 kilograms—used for cargo shipping, vehicle weights, bulk materials, and large-scale measurements.
• Ounce (oz): 1/16 of a pound—common in US for food portions, postal rates, cooking measurements, and small package weights.
• Pound (lb): 16 ounces—primary US weight unit for body weight, groceries, packages, luggage limits, and fitness tracking.
• Stone (st): 14 pounds—traditional UK unit for human body weight, still commonly used in Britain and Ireland.
• US Ton: 2,000 pounds—used in US for vehicle weights, cargo shipping, bulk materials, and large-scale commercial transactions.

Weight Conversion Applications

Temperature Conversions

Temperature conversion is critical for weather forecasting, cooking, scientific research, HVAC systems, medical applications, and international communication. Our temperature converter supports conversions between Celsius (metric standard), Fahrenheit (US standard), Kelvin (scientific standard), and Rankine (engineering applications). Understanding temperature scales helps travelers interpret weather forecasts, cooks follow international recipes, scientists conduct experiments, and engineers design thermal systems.

Temperature Scales

• Celsius (°C): Metric temperature scale—water freezes at 0°C, boils at 100°C. Standard worldwide for weather, cooking, science, and everyday use.
• Fahrenheit (°F): Imperial temperature scale—water freezes at 32°F, boils at 212°F. Primary US scale for weather forecasts, cooking, HVAC, and daily life.
• Kelvin (K): Absolute temperature scale—starts at absolute zero (0K = -273.15°C). Used in scientific research, physics, chemistry, astronomy, and engineering.
• Rankine (°R): Absolute Fahrenheit scale—starts at absolute zero (0°R = -459.67°F). Used in US engineering, thermodynamics, and specialized applications.

Practical Temperature Conversions

Temperature Conversion Formulas

Understanding the mathematical relationships between temperature scales helps verify conversions and understand thermal concepts:

• 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

Additional Conversion Categories

Volume & Capacity Conversions

Volume conversions are essential for cooking, fuel calculations, liquid measurements, chemical mixing, beverage serving sizes, and fluid management. Our volume converter supports milliliters, liters, cubic meters (metric), fluid ounces, cups, pints, quarts, gallons (US and imperial), cubic inches, cubic feet, and cubic yards. Common applications include recipe scaling, fuel efficiency calculations, aquarium sizing, pool volume calculations, beverage measurements, chemical dilutions, and pharmaceutical dosing.

Area & Surface Conversions

Area conversions are vital for real estate, land surveying, agriculture, construction, interior design, and property management. Our area converter handles square millimeters, square centimeters, square meters, hectares (metric), square inches, square feet, square yards, acres, square miles (imperial), and specialized units. Use area conversions for property comparisons, carpet calculations, paint coverage estimates, agricultural land measurements, flooring projects, tile calculations, wallpaper estimates, and land development planning.

Speed & Velocity Conversions

Speed conversions are important for travel planning, navigation, fitness tracking, vehicle specifications, aviation, maritime operations, and sports. Our speed converter supports meters per second, kilometers per hour (metric), feet per second, miles per hour, knots (maritime/aviation), and Mach numbers. Common uses include understanding speed limits abroad, GPS navigation, running pace calculations, cycling speed tracking, aviation speed specifications, boat speed measurements, and vehicle performance comparisons.

Time Duration Conversions

Time conversions help with scheduling, project planning, time zone calculations, duration measurements, and time management. Our time converter handles milliseconds, seconds, minutes, hours, days, weeks, months, and years. Applications include project time estimates, cooking timers, workout duration tracking, travel time calculations, business hour conversions, time zone adjustments, deadline planning, and duration comparisons for productivity optimization.

Digital Storage Conversions

Digital storage conversions are essential for IT professionals, data management, file size understanding, storage planning, and bandwidth calculations. Our digital storage converter supports bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), terabytes (TB), and petabytes (PB) with both decimal (1000-based) and binary (1024-based) standards. Use for understanding file sizes, comparing storage devices, calculating download times, planning backup requirements, managing cloud storage quotas, optimizing database sizes, and estimating data transfer needs.

Frequently Asked Questions

Is this unit converter completely free?

Yes, absolutely! Our unit converter is 100% free with no limitations, premium features, subscription requirements, usage caps, or hidden costs. Convert unlimited measurements across all eight categories as many times as needed without creating accounts or providing any information.

Do conversions work offline?

Yes! All conversions are calculated using client-side JavaScript directly in your browser. After the page loads once, you can perform unlimited conversions without internet connectivity—perfect for travel, remote locations, flights, areas with poor connectivity, or situations requiring offline functionality.

How accurate are the conversions?

Our conversions use scientifically accurate formulas and international standard conversion factors. Results are precise to multiple decimal places, suitable for academic work, professional applications, engineering calculations, scientific research, and everyday use. Temperature conversions account for proper scale differences and offset calculations.

Can I convert between metric and imperial units?

Yes! Our converter seamlessly handles conversions between metric (SI), imperial (US), and international units. Convert meters to feet, kilograms to pounds, Celsius to Fahrenheit, liters to gallons, and any other combination across supported units in all categories.

What's the difference between US and imperial gallons?

US gallons and imperial gallons are different volumes. 1 US gallon = 3.785 liters, while 1 imperial gallon (UK) = 4.546 liters. Imperial gallons are approximately 20% larger. Our converter supports both—select the appropriate gallon unit (US or Imperial) for accurate conversions based on your region.

How do I convert Fahrenheit to Celsius?

Select "Temperature" from the category tabs, choose "Fahrenheit" in the "From" dropdown, enter your temperature value, then select "Celsius" in the "To" dropdown. The conversion appears instantly using the formula: °C = (°F - 32) × 5/9. For example, 68°F converts to 20°C.

Can I convert square feet to square meters?

Yes! Select "Area" from the category tabs, choose "Square Feet" as your starting unit, enter your area value, then select "Square Meters" as the target unit. The conversion uses the factor: 1 square foot = 0.0929 square meters. Ideal for real estate, construction, and interior design projects.

Does this work on mobile devices?

Absolutely! Our unit converter is fully responsive and works perfectly on smartphones and tablets. The interface adapts to mobile screens while maintaining full functionality. All calculations are performed locally on your device, ensuring fast performance regardless of network speed.

Why are there different byte conversions (KB vs KiB)?

Digital storage has two standards: decimal (1 KB = 1,000 bytes) and binary (1 KiB = 1,024 bytes). Decimal units (KB, MB, GB) use powers of 1000, while binary units (KiB, MiB, GiB) use powers of 1024. Our converter supports both standards—the difference becomes more significant with larger sizes (1 GB vs 1 GiB differs by about 7%).

Can I use this for cooking recipe conversions?

Yes! Our converter is perfect for recipe conversions. Use the weight category to convert grams to ounces or pounds to kilograms for ingredients. Use the volume category to convert milliliters to cups or liters to gallons for liquids. Use the temperature category to convert oven temperatures between Celsius and Fahrenheit.

How do I convert kilometers to miles?

Select "Length" (the default category), choose "Kilometers" in the "From" dropdown, enter your distance, then select "Miles" in the "To" dropdown. The result appears instantly using the conversion: 1 kilometer = 0.621371 miles. Perfect for travel planning and GPS navigation.

Are my conversion calculations stored or tracked?

No! All conversions happen entirely in your browser using JavaScript. We don't collect, store, track, or transmit any conversion data. Your privacy is completely protected—no data leaves your device, ensuring absolute confidentiality for all your calculations.

Can I convert light-years or astronomical units?

Our length converter focuses on practical everyday units (millimeters to miles, nautical miles). For specialized astronomical distances (light-years, parsecs, astronomical units), consider dedicated astronomy calculators. However, you can use our converter for intermediate calculations when breaking down astronomical distances.