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Unit converter tools

A collection of the most popular and useful tools that help you easily convert day-to-day data.

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Unit converter tools

A collection of the most popular and useful tools that help you easily convert day-to-day data.

Celsius to Fahrenheit

Convert celsius degrees to fahrenheit degrees with ease.

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Celsius to Kelvin

Convert celsius degrees to kelvin degrees with ease.

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Fahrenheit to Celsius

Convert fahrenheit degrees to celsius degrees with ease.

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Fahrenheit to Kelvin

Convert Fahrenheit degrees to Kelvin degrees with ease.

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Kelvin to Celsius

Convert kelvin degrees to celsius degrees with ease.

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Kelvin to Fahrenheit

Convert kelvin degrees to fahrenheit degrees with ease.

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Mph to Kph

Convert miles per hour (mph) to kilometers per hour (kph) with ease.

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Kph to Mph

Convert kilometers per hour (kph) to miles per hour (mph) with ease.

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Number to Roman Numerals

Convert a number to roman numerals with ease.

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Roman Numerals to Number

Convert roman numerals to a number with ease.

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What Are Unit Converter Tools?

Unit converters translate measurements between systems: miles to kilometers, pounds to kilograms, Celsius to Fahrenheit, acres to hectares. They cover length, weight, volume, area, speed, pressure, energy, power, and more — the everyday math of cooking, travel, engineering, and science.

Why Conversions Go Wrong

Most conversion errors are not arithmetic — they are unit confusion. The classic examples: a recipe calling for "cups" (US vs metric cups differ), a fuel economy figure in MPG (US vs UK gallons differ by 20%), or a temperature where someone converts the interval instead of the absolute value. These tools handle the definitions correctly so you don't have to memorize them.

How to Get Accurate Results

Know your starting unit precisely. "Mile" can mean statute mile, nautical mile, or (rarely) other historical miles. "Ton" can be metric, US short, or UK long. When precision matters — engineering, medicine, trade — confirm which definition your source uses.

Watch significant figures. Converting 5 miles gives 8.04672 km, but if your measurement was only accurate to the nearest mile, "8 km" is the honest answer. These tools show full precision; round to match your input's accuracy.

Temperature is special. Converting 20°C to Fahrenheit is 68°F — but a change of 20°C is a change of 36°F. Absolute temperatures and temperature differences convert differently.

Frequently Asked Questions

What's the difference between US and UK gallons?
A US gallon is 3.785 liters; a UK (imperial) gallon is 4.546 liters — about 20% larger. This is why the same car shows different MPG figures in American vs British reviews.

Why do scientists use the metric system?
Because it is coherent: units relate by powers of ten, and derived units (like the newton or joule) combine without arbitrary conversion factors. Fewer constants to remember means fewer errors.

Are the conversion factors exact?
Defined conversions (like inch = 2.54 cm exactly) are exact by international agreement. Measured conversions (like some historical units) use the best standard values. Results are accurate for all practical purposes.