Click anywhere in the map it will add a marker then click on the other point it will calculate the distance between these two points. You can add multiple points.
Swipe from the left side for more options and get Multiple Map views.

Key Features:

=> You can Measure Distances, Areas
and Elevations in the Google map
=> Draw shapes to measure the area
=> All distance and area units are available in the app
=> Minimum permissions are required to use this app

Maps Area Calculator is a distance measuring tool which calculates distance between two points or the area of shape which you draw.
If precise measurements are important or interesting to you, this is the app you need.
You won’t find one that is better, more accurate and easier to use.