I'd long relied on Google Earth's ruler tool. I didn't like the hassle of installing it on the VM I'm currently using. So I looked, and found Google Maps has one! Just right-click on a point.
https://support.google.com/maps/answer/1628031?co=GENIE.Platform%3DDesktop&hl=en
https://support.google.com/maps/answer/1628031?co=GENIE.Platform%3DDesktop&hl=en