**Conversion of units** is the conversion between different units of measurement for the same quantity, typically through multiplicative **conversion factors**.**Length** is a measure of distance. In the International System of Quantities, length is a quantity with dimension distance. In most systems of measurement a base unit for length is chosen, from which all other units are derived. In the International System of Units (SI) system the base unit for length is the metre.

The **metric system** is a **system** of measurement that uses the meter, liter, and gram as base **units** of length (distance), capacity (volume), and weight (mass) respectively. To measure smaller or larger quantities, we use **units** derived from the **metric units**.

The English system is defined as the measurement system used in many countries including the United States using feet, pounds and seconds.wikipedia

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