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Measurement Units

Convert between physical units across speed, weight, temperature, length, electrical, and more. All conversions use international standard formulas.

Speed Converter

Convert between mph, km/h, m/s, knots, and other speed units.

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Weight Converter

Convert between kg, lbs, oz, grams, stones, and more.

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Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

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Length Converter

Convert between meters, feet, inches, miles, yards, and more.

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Voltage Converter

Convert between volts, millivolts, kilovolts, and megavolts.

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Energy Converter

Convert between joules, calories, kWh, BTU, and more.

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Frequency Converter

Convert between Hz, kHz, MHz, and GHz.

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Ohm's Law Calculator

Calculate resistance, voltage, and current using Ohm's Law.

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About Measurement Units

The International System of Units (SI) is the modern standard for measurement. Our converters handle both SI and imperial units so you can work across any context — engineering, science, everyday use, or international projects.

  • Speed — mph for US road speeds, km/h for international, m/s for physics, knots for aviation
  • Temperature — Celsius for science and most of the world, Fahrenheit for US usage, Kelvin for thermodynamics
  • Energy — joules (SI), calories for nutrition, kWh for electricity, BTU for heating
  • Ohm's Law — relates voltage (V), current (I), and resistance (R) in any circuit