Heard Island and McDonald Islands is about 63 times bigger than Gibraltar.

Gibraltar is approximately 7 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 6,238% larger than Gibraltar.
Tip: This to-scale comparison of Gibraltar 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. Gibraltar

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