A more than $620 million funding boost is needed to ensure Australia's aged care sector meets even basic standards, with the best levels of care for the nation's elderly requiring as much as $3.2 billion more per year from government.

Just 11 per cent of aged care facilities around the country were found to have the best quality of care in a new study, based on consumer experience, compliance with official standards and the use of medication, including sedatives, antipsychotics, opioids and antibiotics.