Alberta is about 1.4 times smaller than British Columbia.

British Columbia is approximately 944,735 km² (364,764 sq mi), while Alberta is approximately 661,848 km² (255,541 sq mi), making Alberta 70.06% the size of British Columbia.
Tip: This to-scale comparison of British Columbia vs. Alberta uses the Mercator projection, which distorts the size of regions near the poles.
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