Lake Superior is about 1.4 times bigger than Lake Michigan.

Lake Michigan is approximately 57,750 km² (22,297 sq mi), while Lake Superior is approximately 82,350 km² (31,795 sq mi), making Lake Superior 43% larger than Lake Michigan.
Tip: This to-scale comparison of Lake Michigan vs. Lake Superior 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.