Cayman Islands is about 1.6 times smaller than Heard Island and McDonald Islands.

Heard Island and McDonald Islands is approximately 412 sq km, while Cayman Islands is approximately 264 sq km, making Cayman Islands 64.08% the size of Heard Island and McDonald Islands.
Tip: This to-scale comparison of Heard Island and McDonald Islands vs. Cayman Islands uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Cayman Islands vs. Heard Island and McDonald Islands

Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.