Elevation Calculator is a free Android app developed by TennyApps that provides accurate height above sea level calculation. The app uses the WGS-84 reference ellipsoid model of sea level to calculate elevation. The app aims to find the reference geoid of a location using its latitude and longitude to calculate the true height above sea level of the location.

The app has features that correct elevation for a location using input latitude, longitude, and altitude. It also corrects elevation from the device's GPS, gets geoid, displays elevation on Google maps, and works offline. The app is especially useful for outdoor activities such as hiking, camping, and other outdoor activities where accurate height above sea level calculation is crucial.