Semicircular Health/Mana/Progress Bars

I'm trying to develop a semicircular bar to display health and mana, I've been tinkering with the circular health bar found here However i cannot figure a way to make it semicircular other than changing the max value in the inverse lerp to be double any value possible, However i feel there may be a more efficient way of doing so and wanted to ask around.

This is the UI i am attempting to make.