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Metric vs imperial: why two systems still coexist

The metric system (SI) was formalised in 1960 by the General Conference on Weights and Measures and is used by every country in the world — except the United States, Liberia, and Myanmar, which officially still use the imperial system. The persistence of imperial in the US creates daily friction for anyone working internationally: recipes use cups and ounces, medical records use pounds, road signs show miles, and temperatures appear in Fahrenheit. Our converter covers all major categories — length, weight, volume, area, speed, pressure and temperature — with no rounding surprises.

The most costly unit conversion mistake in history

In 1999, NASA's Mars Climate Orbiter was lost because one engineering team used metric Newtons while another used imperial pound-force — a unit mismatch that caused the $327 million spacecraft to enter the Martian atmosphere at the wrong angle and disintegrate. This infamous incident illustrates why unit conversion accuracy matters far beyond everyday convenience. Use our Temperature Converter for Celsius/Fahrenheit/Kelvin conversions alongside your other unit work.