New South Wales is about 1.2 times bigger than Alberta.

Alberta is approximately 661,848 km² (255,541 sq mi), while New South Wales is approximately 801,150 km² (309,326 sq mi), making New South Wales 21% larger than Alberta.
Tip: This to-scale comparison of Alberta vs. New South Wales 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.