San Francisco is about 1.5 times bigger than The Hague (Den Haag).

The Hague (Den Haag) (excluding the city's 15.68 sq km of water area) is approximately 82 sq km, while San Francisco (including the city proper only) is approximately 121 sq km, making San Francisco 47% larger than The Hague (Den Haag).
Tip: This to-scale comparison of The Hague (Den Haag) vs. San Francisco uses the Mercator projection, which distorts the size of regions near the poles.