An altimeter is a non-time tool watch complication that displays the altitude of a watch above sea level.

An altimeter is a mechanical device that uses barometric pressure to display altitude on a calibrated scale. Most use a sealed drum with a geared hand. Because barometric pressure can change over time, an altimeter must be set at a known altitude before being used and must be re-set daily. Altimeters have a maximum altitude specification varying from 4,000 to over 30,000 meters.

This complication is often used in pilot's watches or field watches and is similar to the depth meter found on some dive watches.

• Oris Big Crown ProPilot Altimeter (2014) - 15,000 ft
• Favre Leuba Bivouac 9000 (2018) - 9,000 m
• Citizen Promaster Altichron (2018) - 32,000 ft
• Bremont U-22 (2015) - 100,000 ft

• Tool watch
• Depth meter