Australian Capital Territory is about 1.3 times smaller than Yosemite National Park.

Yosemite National Park is approximately 3,027 km² (1,169 sq mi), while Australian Capital Territory is approximately 2,358 km² (910 sq mi), making Australian Capital Territory 77.89% the size of Yosemite National Park.
Tip: This to-scale comparison of Yosemite National Park vs. Australian Capital Territory uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Australian Capital Territory vs. Yosemite National Park

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