As of January 2017, there are 77 commissioned ships in the Royal Navy. 19 of the commissioned vessels are major surface combatants (six guided missile destroyers and 13 frigates) and 10 are nuclear-powered submarines (four ballistic missile submarines and six fleet submarines as of 2016).
How much presence can the RN actually present?
The US Navy has its own problems when it comes to fleet size.
http://index.heritage.org/military/2...ower/u-s-navy/