How Many Krisflyer Miles Do I Need To Upgrade Anyone Know How Many Krisflyer Miles I Require To Upgrade My Economy Ticket To Business Class?

Anyone know how many krisflyer miles I require to upgrade my economy ticket to business class? - how many krisflyer miles do i need to upgrade

SIA'm flight from Singapore to Bangalore, India. PPS I am a member of the gold. Any idea how many miles do I need?