Altimeter

Altimeter is a powerful Chrome extension that provides precise altitude measurements by utilizing GPS and your device's built-in barometer. While GPS offers absolute altitude outdoors, combining it with barometer data allows for highly accurate indoor and outdoor elevation tracking.

Key features include the ability to set a base altitude for tracking elevation differences during activities like hiking or biking, multiple calibration methods using GPS or standard sea level pressure, and alerts for when recalibration is needed due to weather-related air pressure changes. Users can easily switch between metric and imperial units. This ad-supported freeware offers reliable altitude monitoring without watch support, making it an essential tool for outdoor enthusiasts and professionals needing elevation data.