A man is being treated in hospital after his car plunged around 30 metres off a cliff in Sydney's east.

Earlier this morning, police found the vehicle upside down on rocks in Clovelly.

It had fallen 30 metres, flipped over and come to rest on a rock platform.

Witnesses say they heard cries for help and found the car at the bottom of the cliff near Burrows Park at Ocean Street in Clovelly.

Paramedics took the 27-year-old man to Royal North Shore hospital via helicopter this morning.

The man is in a stable condition, a hospital spokesperson said.

@NSWAmbulance @nswpolice @FRNSW working together to rescue and treat a patient at Clovelly this morning pic.twitter.com/XzWmXqqx9F — NSW Ambulance (@NSWAmbulance) December 28, 2014

Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14 or Suicide Call Back Service on 1300 659 467.