Heard Island and McDonald Islands is about 9 times bigger than Pitcairn Islands.

Pitcairn Islands is approximately 47 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 777% larger than Pitcairn Islands.
Tip: This to-scale comparison of Pitcairn 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. Pitcairn Islands

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