Half Dome Satellite View

Note: if you're on a cell phone, you'll probably need to zoom the map out a bit to see the trail.

Hike Distance:  14.2 miles (22.7 km) round trip via Mist Trail
16.5 miles (26.5 km) round trip via John Muir Trail
20 miles (32 km) round trip via Glacier Point
23 miles (37 km) round trip via Tenaya Lake
7 miles (11 km) round trip from Little Yosemite Valley campground
Half Dome Elevation:  8,842 feet (2,695 meters)
Total Elevation Gain:  4,800 feet (1,600 meters) from Yosemite Valley

The red line: the Mist Trail from Yosemite Valley to the top of Nevada Fall
The yellow line: the ascent from the top of Nevada Fall to the Half Dome summit
The blue line: the Panorama Trail, a longer route from Glacier Point that meets the regular route at the top of Nevada Fall
The green line: Muir Trail alternatives to the Mist Trail - longer and less scenic, but also less steep
The purple line: The Tenaya Lake route to Half Dome

The gash running north and west of the trail is the Tenaya Creek canyon. A trail goes part of the way up the canyon to Mirror Lake and the Snow Creek Trail, but the upper canyon has no official trails. The dark blob at the northermost trailhead is Tenaya Lake, roughly a mile from end to end.