Heard Island and McDonald Islands is about 159 times smaller than Sri Lanka.

Sri Lanka is approximately 65,610 sq km, while Heard Island and McDonald Islands is approximately 412 sq km, making Heard Island and McDonald Islands 0.63% the size of Sri Lanka.
Tip: This to-scale comparison of Sri Lanka 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. Sri Lanka

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