Heard Island and McDonald Islands is about 2.3 times smaller than Turks and Caicos Islands.

Turks and Caicos Islands is approximately 948 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 43.46% the size of Turks and Caicos Islands.
Tip: This to-scale comparison of Turks and Caicos Islands vs. Heard Island and McDonald Islands uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Heard Island and McDonald Islands vs. Turks and Caicos Islands

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