Monaco is about 41 times smaller 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 Monaco is approximately 2 sq km, making Monaco 2.43% the size of The Hague (Den Haag).
Tip: This to-scale comparison of The Hague (Den Haag) vs. Monaco uses the Mercator projection, which distorts the size of regions near the poles.