Sydney is about 10 times smaller than Saint Kitts and Nevis.

Saint Kitts and Nevis is approximately 261 sq km, while Sydney is approximately 27 sq km, making Sydney 10.23% the size of Saint Kitts and Nevis.
Tip: This to-scale comparison of Saint Kitts and Nevis vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.