A fuel totalizer is a component which indicates the:

The fuel totalizer is an important instrument in aircraft fuel management. Its main function is to keep track of the total amount of fuel available from all tanks combined. This total gives pilots critical information about how much fuel they have used and how much remains for their flight planning, which is essential for safety and efficiency during operations.

This instrument consolidates data from various fuel tanks within the aircraft, allowing pilots to monitor the overall fuel status without needing to check individual tank levels separately. By providing a single, comprehensive figure, the fuel totalizer helps in making timely decisions regarding fuel management, such as when to refuel and how to adjust flight plans if fuel consumption rates change.

Understanding the total fuel available from all tanks directly supports flight safety and operational efficiency, which is why this component is crucial in the design of modern aircraft fuel systems.