According to NASA, about how tall is Olympus Mons on Mars from base to summit?

The answer

NASA puts Olympus Mons at more than 40 km (25+ miles) from base to summit, with a footprint as wide as Arizona. Lower gravity and a stuck tectonic plate let the volcano keep piling up for eons.

Correct answer: More than 40 km (25+ miles), dwarfing Everest