Private Class B Network

Hi,

What I understood in the Private ip assignment as per RFP 1918 by IETF was

172.16.0.0 - 172.31.255.255

Would like to know how many hosts are under this address we can provide. Also is there any calculator available to calculate the same

Regards,
Satheesh Rabindranath

Every subnet of 172.16.x.x gives 65536 Ips where 655534 are usable Ips.