Hawaii is about 11 times bigger than Oahu.

Oahu is approximately 1,545 km² (597 sq mi), while Hawaii is approximately 16,635 sq km, making Hawaii 977% larger than Oahu.
Tip: This to-scale comparison of Oahu vs. Hawaii 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.