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Unit Conversion Calculators — Convert Anything Fast

Unit conversion calculators for length, weight, temperature, and area.

258 calculators

Engineers, scientists, cooks, travelers—they all deal with various measurement systems every day. Our unit conversion tools eliminate the uncertainty and errors from the process. You’ll find converters for everything: miles to kilometers, pascals to atmospheres, and much more. Simply select your starting and target units, enter the number, and view your result instantly. No hassle, no mistakes—just quick, precise answers.

Browse by Subcategory

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Measurement Converters

Convert between units of length, weight, area, and temperature.

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Length & Distance Converters

Explore our collection of Length & Distance Converters for accurate calculations and conversions.

Centimeters to Inches Converter Feet and Inches Calculator Feet to Meters Converter Inches to Centimeters Converter Inches to Millimeters Converter View all 12 calculators

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General Unit Converter

All-in-one unit conversion tool for any measurement type.

Unit Converter

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Specialized Length Converters

Explore our collection of Specialized Length Converters for accurate calculations and conversions.

Angstroms to Nanometers Converter Astronomical Unit Calculator Fathoms to Feet Converter Light Year Conversion Micrometers to Millimeters Converter View all 11 calculators

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Weight & Mass Converters

Explore our collection of Weight & Mass Converters for accurate calculations and conversions.

Grams to Ounces Converter Kilograms to Pounds Converter Metric Tons to Pounds Converter Ounces to Grams Converter Pounds to Kilograms Converter View all 8 calculators

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Specialized Weight Converters

Explore our collection of Specialized Weight Converters for accurate calculations and conversions.

Atomic Mass Units to Kilograms Converter Carats to Grams Converter Grains to Grams Converter Pennyweight to Grams Converter Planck Mass to Kilograms Converter View all 7 calculators

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Temperature Converters

Explore our collection of Temperature Converters for accurate calculations and conversions.

Celsius to Fahrenheit Converter Celsius to Kelvin Converter Celsius to Rankine Converter Fahrenheit to Celsius Converter Fahrenheit to Kelvin Converter View all 10 calculators

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Basic Area Converters

Explore our collection of Basic Area Converters for accurate calculations and conversions.

Acres to Hectares Converter Acres to Square Feet Converter Area Conversion Calculator Hectares to Acres Converter Square Feet to Acres Converter View all 9 calculators

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Specialized Area Converters

Explore our collection of Specialized Area Converters for accurate calculations and conversions.

Ares to Square Meters Converter Dunams to Acres Converter Perches to Square Meters Converter Roods to Square Feet Converter Square Centimeters to Square Inches Converter View all 8 calculators

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Volume & Capacity Converters

Explore our collection of Volume & Capacity Converters for accurate calculations and conversions.

Cubic Feet to Cubic Meters Converter Cubic Meters to Cubic Feet Converter Fluid Ounces to Milliliters Converter Gallons to Liters Converter Liters to Gallons Converter View all 7 calculators

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Specialized Volume Converters

Explore our collection of Specialized Volume Converters for accurate calculations and conversions.

Acre-Feet to Cubic Meters Converter Barrels to Liters Converter Bushels to Cubic Feet Converter Cords to Cubic Meters Converter Cups to Milliliters Converter View all 11 calculators

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Basic Time Converters

Explore our collection of Basic Time Converters for accurate calculations and conversions.

Days to Weeks Converter Hours to Days Converter Minutes to Hours Converter Months to Years Converter Seconds to Minutes Converter View all 8 calculators

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Specialized Time Converters

Explore our collection of Specialized Time Converters for accurate calculations and conversions.

Attoseconds to Femtoseconds Converter Femtoseconds to Picoseconds Converter Fortnights to Days Converter Lunar Months to Days Converter Microseconds to Milliseconds Converter View all 10 calculators

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Basic Speed Converters

Explore our collection of Basic Speed Converters for accurate calculations and conversions.

Feet per Second to Miles per Hour Converter Kilometers per Hour to Meters per Second Converter Kilometers per Hour to Miles per Hour Converter Knots to Kilometers per Hour Converter Knots to Miles per Hour Converter View all 10 calculators

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Specialized Speed Converters

Explore our collection of Specialized Speed Converters for accurate calculations and conversions.

Knots to Feet per Second Converter Mach to Kilometers per Hour Converter Mach to Miles per Hour Converter Speed of Light to Kilometers per Second Converter Speed of Sound to Meters per Second Converter View all 6 calculators

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Basic Pressure Converters

Explore our collection of Basic Pressure Converters for accurate calculations and conversions.

Atmospheres to PSI Converter Bars to PSI Converter Kilopascals to PSI Converter Megapascals to PSI Converter Pascals to PSI Converter View all 10 calculators

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Specialized Pressure Converters

Explore our collection of Specialized Pressure Converters for accurate calculations and conversions.

Centimeters of Water to Pascals Converter Inches of Mercury to PSI Converter Inches of Water to PSI Converter Kilograms per Square Centimeter to PSI Converter Millibars to Pascals Converter View all 9 calculators

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Energy & Power Converters

Explore our collection of Energy & Power Converters for accurate calculations and conversions.

BTU to Joules Converter Calories to Joules Converter Electronvolts to Joules Converter Energy Converter (General)Joules to BTU Converter View all 10 calculators

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Power Converters

Explore our collection of Power Converters for accurate calculations and conversions.

BTU per Hour to Watts Converter Calories per Second to Watts Converter Ergs per Second to Watts Converter Foot-Pounds per Minute to Watts Converter Horsepower to Watts Converter View all 10 calculators

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Force & Torque Converters

Explore our collection of Force & Torque Converters for accurate calculations and conversions.

Dynes to Newtons Converter Force Converter (General)Kilograms-Force to Newtons Converter Kips to Newtons Converter Newtons to Pounds-Force Converter View all 8 calculators

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Torque Converters

Explore our collection of Torque Converters for accurate calculations and conversions.

Dyne-Centimeters to Newton-Meters Converter Foot-Pounds to Inch-Pounds Converter Foot-Pounds to Newton-Meters Converter Inch-Pounds to Newton-Meters Converter Kilogram-Meters to Newton-Meters Converter View all 8 calculators

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Data & Digital Storage Converters

Explore our collection of Data & Digital Storage Converters for accurate calculations and conversions.

Bits to Bytes Converter Bytes to Kilobytes Converter Data Storage Converter (General)Gigabytes to Terabytes Converter Kilobytes to Megabytes Converter View all 10 calculators

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Data Transfer Rate Converters

Explore our collection of Data Transfer Rate Converters for accurate calculations and conversions.

Data Transfer Rate Converter Gigabits per Second to Megabytes per Second Converter Kilobits per Second to Kilobytes per Second Converter Megabits per Second to Gigabits per Second Converter Megabits per Second to Megabytes per Second Converter

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Angle Converters

Explore our collection of Angle Converters for accurate calculations and conversions.

Angle Converter (General)Degrees to Radians Converter Gradians to Degrees Converter Minutes of Arc to Degrees Converter Radians to Degrees Converter View all 7 calculators

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Density Converters

Explore our collection of Density Converters for accurate calculations and conversions.

Density Converter (General)Grams per Cubic Centimeter to Kilograms per Cubic Meter Converter Kilograms per Cubic Meter to Pounds per Cubic Foot Converter Pounds per Cubic Foot to Kilograms per Cubic Meter Converter Pounds per Gallon to Kilograms per Cubic Meter Converter

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Fuel Economy Converters

Explore our collection of Fuel Economy Converters for accurate calculations and conversions.

Fuel Economy Converter Kilometers per Liter to Miles per Gallon Converter Liters per 100 Kilometers to Miles per Gallon Converter Miles per Gallon to Liters per 100 Kilometers Converter

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Viscosity Converters

Explore our collection of Viscosity Converters for accurate calculations and conversions.

Pascal-Seconds to Poise Converter Poise to Pascal-Seconds Converter Stokes to Square Meters per Second Converter Viscosity Converter (Dynamic)Viscosity Converter (Kinematic)

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Flow Rate Converters

Explore our collection of Flow Rate Converters for accurate calculations and conversions.

Cubic Meters per Hour to Cubic Feet per Minute Converter Flow Rate Converter (Mass)Flow Rate Converter (Molar)Flow Rate Converter (Volumetric)Liters per Second to Gallons per Minute Converter

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Electricity & Magnetism Converters

Explore our collection of Electricity & Magnetism Converters for accurate calculations and conversions.

Capacitance Converter Electric Conductance Converter Electric Current Converter Electric Potential Converter Electric Resistance Converter View all 8 calculators

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Light & Radiation Converters

Explore our collection of Light & Radiation Converters for accurate calculations and conversions.

Frequency Wavelength Converter Illumination Converter Luminance Converter Luminous Intensity Converter Radiation Converter (Absorbed Dose)View all 7 calculators

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Sound Converters

Explore our collection of Sound Converters for accurate calculations and conversions.

Bel to Decibel Converter Neper to Decibel Converter Sound Level Converter

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Prefixes & Typography Converters

Explore our collection of Prefixes & Typography Converters for accurate calculations and conversions.

EM to Pixels Converter Pixels to Inches Converter (Print)PostScript Points to Inches Converter SI Prefixes Converter Typography Converter (Points, Picas)

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Cooking Converters

Explore our collection of Cooking Converters for accurate calculations and conversions.

Cooking Unit Converter Cups to Grams Converter Grams to Cups Converter Oven Temperature Converter Recipe Converter (Scaling)View all 6 calculators

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Clothing & Shoe Size Converters

Explore our collection of Clothing & Shoe Size Converters for accurate calculations and conversions.

Bra Size Converter Clothing Size Converter (Men)Clothing Size Converter (Women)Hat Size Converter Ring Size Converter View all 6 calculators

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Currency Converters

Explore our collection of Currency Converters for accurate calculations and conversions.

Bitcoin to USD Converter Cryptocurrency Converter Currency Converter (General)Ethereum to USD Converter

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Health & Medical Converters

Explore our collection of Health & Medical Converters for accurate calculations and conversions.

Blood Sugar Converter (mmol/L to mg/dL)BMI Converter (Metric to Imperial)Cholesterol Converter (mmol/L to mg/dL)Creatinine Converter (mg/dL to μmol/L)Hemoglobin Converter (g/dL to mmol/L)

Accurate Conversions Across Every System

We live in a world where different measurement systems intersect daily. In the U.S., inches and pounds are commonly used, but science relies on metric units, and engineers often need to handle both. That’s where our converters come in. We source our conversion factors directly from NIST and international standards, ensuring you get reliable results every time.

Length & Distance

Switch easily between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. For navigation or astronomy, we also include nautical miles, light-years, and astronomical units.

Weight & Mass

Need to convert grams to pounds or kilograms to ounces? It’s simple. We also support metric tons, stones, and for specialists, troy ounces for precious metals and carats for gemstones.

Supported Unit Categories

Temperature – Celsius, Fahrenheit, Kelvin, and Rankine are covered, using precise offset-based formulas.
Volume – Liters, milliliters, gallons (US and UK), cups, tablespoons, fluid ounces, and cubic meters are all available.
Area – Choose from square meters, hectares, acres, square feet, and square miles.
Speed – Convert between km/h, mph, m/s, knots, and Mach number.
Digital Storage – We support bytes, KB, MB, GB, TB, and PB, with both binary (1024) and decimal (1000) standards.

Why Precision Matters

Even a small mistake in unit conversion is not just a minor error—it can have serious consequences. For an engineer, it could mean the difference between safety and disaster. In medicine, it could mean the difference between a correct dose and a dangerous error. That’s why our tools use full floating-point precision and display results down to the decimal places that matter for your needs.

Frequently Asked Questions

Multiply the Celsius temperature by 9/5 (or 1.8), then add 32. For example, 25°C Ã— 1.8 + 32 = 77°F. Our temperature converter handles this instantly and also supports Kelvin and Rankine scales.

A US gallon equals approximately 3.785 liters, while a UK (imperial) gallon equals approximately 4.546 liters. The imperial gallon is about 20% larger. Our volume converter distinguishes between the two, so always check which system your recipe or specification uses.

Neither system is inherently more accurate — accuracy depends on the precision of your measurement, not the unit system. However, metric units are designed around powers of ten, which makes conversions within the system simpler and less prone to arithmetic errors.

There are two standards: binary (1 KB = 1,024 bytes) used by operating systems, and decimal (1 KB = 1,000 bytes) used by storage manufacturers. This is why a 1 TB drive shows less than 1 TB in your OS. Our converter supports both standards so you always know the true capacity.

To convert kilograms (kg) to pounds (lbs), multiply the weight in kg by 2.20462 (the exact conversion factor). For example, 75 kg × 2.20462 = 165.3465 lbs (usually rounded to 165 lbs). The reverse (lbs to kg) is divide by 2.20462. This is the international avoirdupois pound standard used worldwide. Our kg to lbs converter handles instant bidirectional conversion, supports decimals, and includes a quick reference chart for common weights like body weight or luggage.

To convert miles to kilometers, multiply the distance in miles by 1.60934 (the exact conversion factor). For example, 60 miles × 1.60934 = 96.5604 km (typically rounded to 96.6 km). The reverse (km to miles) is divide by 1.60934. This factor comes from the international definition (1 mile = 1.609344 km). Our miles to km calculator provides instant results, supports large distances (e.g., road trips), and includes both directions with decimal precision.

There are exactly 0.393701 inches in 1 centimeter (or 1 inch = 2.54 cm). To convert centimeters to inches, multiply cm by 0.393701; to convert inches to cm, multiply inches by 2.54. For example, 10 cm × 0.393701 ≈ 3.937 inches. This is the international standard since 1959. Our inches to cm converter handles fast bidirectional conversion, supports fractions/decimals, and includes a visual comparison chart for quick reference (e.g., height, screen sizes).

There are two main gallons: US gallon (3.78541 liters) and UK/imperial gallon (4.54609 liters). To convert liters to US gallons, divide liters by 3.78541; to UK gallons, divide by 4.54609. For example, 50 liters ÷ 3.78541 ≈ 13.21 US gallons. The US gallon is more common in the United States for fuel and beverages, while the UK gallon is used in the UK and some Commonwealth countries. Our liters to gallons calculator lets you choose US or UK gallon, supports reverse conversion, and shows both for clarity.