Feet to Flight Level Converter

Feet to Flight Level Conversion

Converting feet to flight level is useful in aviation, flight planning, air traffic control, pilot training, and aircraft navigation. Flight levels are used to describe aircraft altitude in a standardized format, particularly during high-altitude operations. In aviation, a flight level is expressed as FL followed by a number representing hundreds of feet. For example, FL100 represents a pressure altitude of 10,000 feet when the standard pressure setting is used.

Feet are commonly used to describe altitude in aviation in the United States, United Kingdom, and many other countries. A flight level is not simply a geometric height above sea level; it refers to pressure altitude based on the standard atmospheric pressure setting of 1013.25 hPa, or 29.92 inHg. This distinction is important because the actual altitude of an aircraft above sea level can differ from its flight level depending on atmospheric pressure and the altimeter setting.

Users often search phrases such as “convert feet to flight level,” “feet to FL calculator,” “altitude to flight level,” or “flight level conversion” when studying aviation charts, planning flights, or learning aircraft altitude terminology. For a basic conversion, the pressure altitude in feet is divided by 100 to obtain the flight level number.

Mathematics Formula:
Flight Level = Pressure Altitude in Feet ÷ 100

For example, a pressure altitude of 18,000 feet corresponds to FL180 because 18,000 divided by 100 equals 180. Similarly, 25,000 feet corresponds to FL250. This basic calculation assumes that the input is pressure altitude referenced to the standard pressure setting and does not account for local transition altitude, transition level, or jurisdiction-specific flight-level procedures.

The conversion table below provides common pressure altitude values and their corresponding flight levels. It is intended as a quick mathematical reference for aviation education and general conversion purposes. Operational flight levels should always be determined according to applicable aviation regulations, air traffic control instructions, and current flight procedures.

Feet to Flight Level Conversion Table