what size anchor chain for a 25 foot yacht is recommended?

[mcframe]

25' boat; 25 mm 8mm chain + 25 m octoplait. Can add more octoplait if necessary. 10 kg anchor. Works well.
Shoal draft, bilge keels, takes ground well; I sail mostly in areas (W Solent, Poole) with small tidal range and therefore rarely have all the chain (let alone warp) out.

27' boat; 10M 8mm chain + 45 m 12mm octoplait Never had the need to add more†. Steel spade 60 (10 kg) Works well - never need snubber.
Shoal draft, bilge keels, takes ground well; I sail mostly in areas (E/W Solent, Poole) with small tidal range and therefore rarely have all the warp (but always all the chain) out.


†original 7.5 kg Bruce, ~5M chain, ~30m warp was relegated to kedge when I bought the boat.