Online Unit Converter Calculator

✦ FREE ONLINE TOOL

Unit Converter Calculator

Convert between 14 categories and hundreds of units — instantly, accurately, and for free.

14Categories
159+Units
∞Conversions
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Length Converter

15 units
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Common Length Conversions

1 Meter (m)= 0.001Kilometer (km)
1 Meter (m)= 100Centimeter (cm)
1 Meter (m)= 1000Millimeter (mm)
1 Kilometer (km)= 100000Centimeter (cm)
1 Kilometer (km)= 1000000Millimeter (mm)
1 Centimeter (cm)= 10Millimeter (mm)

About Length Conversions

Length conversion is one of the most common calculation needs. Whether you're converting meters to feet for construction, miles to kilometers for travel, or inches to centimeters for everyday measurements, our length converter handles it all. The international meter is the SI base unit for length, defined as the distance light travels in 1/299,792,458 of a second.

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Weight & Mass Converter

14 units
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Common Weight & Mass Conversions

1 Kilogram (kg)= 1000Gram (g)
1 Kilogram (kg)= 1000000Milligram (mg)
1 Kilogram (kg)= 1.0000e+9Microgram (µg)
1 Gram (g)= 1000Milligram (mg)
1 Gram (g)= 1000000Microgram (µg)
1 Milligram (mg)= 1000Microgram (µg)

About Weight & Mass Conversions

Weight and mass conversion is essential in cooking, science, trade, and everyday life. Convert kilograms to pounds, grams to ounces, or metric tons to short tons with precision. The kilogram is the SI base unit of mass and is defined relative to the Planck constant.

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Temperature Converter

8 units
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Common Temperature Conversions

1 Celsius (°C)= Use calculator →Fahrenheit (°F)
1 Celsius (°C)= Use calculator →Kelvin (K)
1 Celsius (°C)= Use calculator →Rankine (°R)
1 Fahrenheit (°F)= Use calculator →Kelvin (K)
1 Fahrenheit (°F)= Use calculator →Rankine (°R)
1 Kelvin (K)= Use calculator →Rankine (°R)

About Temperature Conversions

Temperature conversion is vital in weather, cooking, science, and industry. Celsius is used globally, Fahrenheit primarily in the US, and Kelvin in scientific contexts. Use our calculator to instantly convert between all major temperature scales including Kelvin, Rankine, Delisle, Newton, Réaumur, and Rømer.

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Area Converter

12 units
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Common Area Conversions

1 Square Meter (m²)= 0.000001Square Kilometer (km²)
1 Square Meter (m²)= 10000Square Centimeter (cm²)
1 Square Meter (m²)= 1000000Square Millimeter (mm²)
1 Square Kilometer (km²)= 1.0000e+10Square Centimeter (cm²)
1 Square Kilometer (km²)= 1.0000e+12Square Millimeter (mm²)
1 Square Centimeter (cm²)= 100Square Millimeter (mm²)

About Area Conversions

Area conversions are essential in real estate, agriculture, and construction. Convert square meters to square feet, acres to hectares, and more. One acre equals 4,046.86 square meters and is commonly used for land measurement in the US and UK.

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Volume Converter

19 units
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Common Volume Conversions

1 Liter (L)= 1000Milliliter (mL)
1 Liter (L)= 0.001Cubic Meter (m³)
1 Liter (L)= 1000Cubic Centimeter (cm³)
1 Milliliter (mL)= 0.000001Cubic Meter (m³)
1 Milliliter (mL)= 1Cubic Centimeter (cm³)
1 Cubic Meter (m³)= 1000000Cubic Centimeter (cm³)

About Volume Conversions

Volume conversion matters in cooking, chemistry, and trade. Convert liters to gallons, milliliters to fluid ounces, or cubic meters to cubic feet. Note that US and UK gallon sizes differ — a US gallon is 3.785 liters while a UK imperial gallon is 4.546 liters.

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Speed Converter

8 units
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Common Speed Conversions

1 Meters/Second (m/s)= 3.59999997Kilometers/Hour (km/h)
1 Meters/Second (m/s)= 2.23693629Miles/Hour (mph)
1 Meters/Second (m/s)= 1.94384451Knot (kn)
1 Kilometers/Hour (km/h)= 0.6213712Miles/Hour (mph)
1 Kilometers/Hour (km/h)= 0.53995681Knot (kn)
1 Miles/Hour (mph)= 0.86897625Knot (kn)

About Speed Conversions

Speed conversions are used in transportation, aviation, and physics. Convert km/h to mph, meters per second to knots, or Mach number to kilometers per hour. Mach 1 equals approximately 1,235 km/h (767 mph) at sea level under standard conditions.

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Time Converter

13 units
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Common Time Conversions

1 Second (s)= 1000Millisecond (ms)
1 Second (s)= 1000000Microsecond (µs)
1 Second (s)= 1.0000e+9Nanosecond (ns)
1 Millisecond (ms)= 1000Microsecond (µs)
1 Millisecond (ms)= 1000000Nanosecond (ns)
1 Microsecond (µs)= 1000Nanosecond (ns)

About Time Conversions

Time conversion spans from nanoseconds in computing to millennia in history. Convert seconds to minutes, hours to days, or calculate durations across any time scale. All values are based on SI definitions and standard calendar conventions.

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Energy Converter

12 units
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Common Energy Conversions

1 Joule (J)= 0.001Kilojoule (kJ)
1 Joule (J)= 0.23900574Calorie (cal)
1 Joule (J)= 0.00023901Kilocalorie (kcal)
1 Kilojoule (kJ)= 239.00573614Calorie (cal)
1 Kilojoule (kJ)= 0.23900574Kilocalorie (kcal)
1 Calorie (cal)= 0.001Kilocalorie (kcal)

About Energy Conversions

Energy conversion is critical in physics, nutrition, and engineering. Convert joules to calories, BTUs to kilowatt-hours, and more. A dietary calorie (kcal) is 4,184 joules. One kilowatt-hour equals 3.6 megajoules of energy.

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Pressure Converter

11 units
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Common Pressure Conversions

1 Pascal (Pa)= 0.001Kilopascal (kPa)
1 Pascal (Pa)= 0.000001Megapascal (MPa)
1 Pascal (Pa)= 0.00001Bar
1 Kilopascal (kPa)= 0.001Megapascal (MPa)
1 Kilopascal (kPa)= 0.01Bar
1 Megapascal (MPa)= 10Bar

About Pressure Conversions

Pressure conversion is used in meteorology, engineering, and medicine. Convert atmospheres to pascals, PSI to bar, or mmHg to kilopascals. Standard atmospheric pressure at sea level is 101,325 Pa or 14.696 PSI.

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Data Storage Converter

16 units
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Common Data Storage Conversions

1 Bit (b)= 0.125Byte (B)
1 Bit (b)= 0.001Kilobit (Kb)
1 Bit (b)= 0.000125Kilobyte (KB)
1 Byte (B)= 0.008Kilobit (Kb)
1 Byte (B)= 0.001Kilobyte (KB)
1 Kilobit (Kb)= 0.125Kilobyte (KB)

About Data Storage Conversions

Data storage conversion is essential in computing and networking. Convert between bits, bytes, kilobytes, megabytes, gigabytes, and terabytes. Note the difference between decimal (SI) prefixes (1 KB = 1000 bytes) and binary (IEC) prefixes (1 KiB = 1024 bytes).

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Power Converter

10 units
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Common Power Conversions

1 Watt (W)= 0.001Kilowatt (kW)
1 Watt (W)= 0.000001Megawatt (MW)
1 Watt (W)= 1.0000e-9Gigawatt (GW)
1 Kilowatt (kW)= 0.001Megawatt (MW)
1 Kilowatt (kW)= 0.000001Gigawatt (GW)
1 Megawatt (MW)= 0.001Gigawatt (GW)

About Power Conversions

Power conversion applies in engineering, electricity, and automotive. Convert watts to horsepower, kilowatts to BTU/hour, and more. One mechanical horsepower equals 745.7 watts. Power is the rate of energy transfer or work done per unit time.

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Frequency Converter

8 units
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Common Frequency Conversions

1 Hertz (Hz)= 0.001Kilohertz (kHz)
1 Hertz (Hz)= 0.000001Megahertz (MHz)
1 Hertz (Hz)= 1.0000e-9Gigahertz (GHz)
1 Kilohertz (kHz)= 0.001Megahertz (MHz)
1 Kilohertz (kHz)= 0.000001Gigahertz (GHz)
1 Megahertz (MHz)= 0.001Gigahertz (GHz)

About Frequency Conversions

Frequency conversion is key in electronics, signal processing, and physics. Convert hertz to kilohertz, megahertz to gigahertz, or RPM to radians per second. Wi-Fi operates at 2.4 GHz and 5 GHz bands, while AM radio uses the kilohertz range.

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Angle Converter

8 units
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Common Angle Conversions

1 Degree (°)= 0.01745329Radian (rad)
1 Degree (°)= 1.11111111Gradian (grad)
1 Degree (°)= 59.9999988Arcminute (')
1 Radian (rad)= 63.66197722Gradian (grad)
1 Radian (rad)= 3437.74670125Arcminute (')
1 Gradian (grad)= 53.99999892Arcminute (')

About Angle Conversions

Angle conversion is used in geometry, navigation, and engineering. Convert degrees to radians, gradians to arcminutes, and more. A full circle is 360°, 2π radians, or 400 gradians. Radians are the SI-preferred unit for angle measurement.

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Fuel Economy Converter

5 units
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Common Fuel Economy Conversions

1 MPG (US)= 1.20095019MPG (UK)
1 MPG (US)= 235.214583L/100km
1 MPG (US)= 0.42514368km/L
1 MPG (UK)= 282.480999L/100km
1 MPG (UK)= 0.35400609km/L
1 L/100km= 99.99999277km/L

About Fuel Economy Conversions

Fuel economy conversion helps compare vehicle efficiency across regions. Convert miles per gallon (US or UK) to liters per 100 km or km/L. US MPG and UK MPG differ because the US gallon (3.785 L) is smaller than the UK imperial gallon (4.546 L).

✦ All conversions are performed using internationally accepted standards & formulas. Results are for informational purposes.

How to Use the Unit Converter Calculator

Step 1: Select a Category

Step 2: Enter a Value

Step 3: Select the From Unit

Step 4: Select the To Unit

Step 5: View the Result

What is a unit converter?

A unit converter is a tool that converts measurements from one unit to another while maintaining the same quantity or value.

Why should I use a unit converter?

A unit converter saves time, reduces calculation errors, and provides accurate results instantly.

What types of units can I convert?

This calculator supports Length, Weight, Temperature, Area, Volume, Speed, Time, Energy, Pressure, Data Storage, Power, Frequency, Angle, and Fuel Economy conversions.

Is this unit converter free to use?

Yes, the Unit Converter Calculator is completely free and can be used as many times as needed.

Can I convert temperature units?

Yes. You can convert between Celsius, Fahrenheit, Kelvin, Rankine, and other supported temperature scales.

Can I convert data storage units?

Yes. The calculator supports bits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, and more.

Can I convert fuel economy measurements?

Yes. You can convert between MPG (US), MPG (UK), km/L, and L/100km.

Are the conversion results accurate?

Yes. The calculator uses standard conversion formulas to provide accurate and reliable results.

Can I convert scientific and engineering units?

Yes. The calculator supports many scientific and engineering units including pressure, power, energy, frequency, and angle measurements.

Is the calculator suitable for students?

Yes. Students, teachers, engineers, scientists, travelers, and professionals can all use this tool.

For more details about unit and unit convertor visit the following websites

What Is Unit Conversion?

Learn the basics of unit conversion and why it is important in science, engineering, education, and daily life.

What Is the Metric System?

Understand how the metric system works and why it is widely used around the world.

International System of Units (SI)

Explore the official SI units used for measurement standards worldwide.

Imperial Units Explained

Learn about imperial measurements such as feet, inches, pounds, and gallons.

Length Measurement Guide

Discover common length units including meters, kilometers, feet, inches, and miles.

Weight and Mass Conversion

Learn the difference between weight and mass and how their units are converted.

Temperature Conversion Guide

Understand Celsius, Fahrenheit, Kelvin, and other temperature scales.

Data Storage Units Explained

Learn about bytes, kilobytes, megabytes, gigabytes, terabytes, and beyond.

Fuel Economy Measurements

Understand MPG, km/L, and L/100km fuel economy standards.

Pressure Units Guide

Learn about PSI, bar, pascal, atmosphere, and other pressure units.