Conversion Calculator
Use this Conversion Calculator to convert between commonly used units. Select a category, choose your current and desired units, and enter a value to see the conversion.
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Different Systems of Units
Historically, many different systems of units have been used. A system of units defines relationships between measurements — like meters for length, kilograms for mass, and seconds for time. Over time, universal systems such as the metric system and SI (International System of Units) have been adopted to maintain consistency and enable scientific collaboration.
History of the Pound
The pound traces back to ancient civilizations like the Arabs, who used silver coins as weight standards. Through European trade, the pound evolved, eventually leading to the British avoirdupois system — the modern pound, officially defined as 0.45359237 kilograms since 1959.
Brief History of the Metric System
The metric system began in France in 1795 as a decimal-based system for all measurements. It became the foundation for the International System of Units (SI), established in 1960. Today, SI is used worldwide for scientific and industrial purposes.