The UK government’s National Minimum Standards for Adult Social Care set out the following requirements for care homes:
There should be at least one carer for every eight residents during the day and at least two carers on duty at night.
There should be at least two carers on duty at all times during mealtimes.
There should be at least one carer on duty during the day and at least two carers on duty at night for residents who need help with personal care or who have dementia.
So, based on these standards, the correct staffing levels for your nursing home would be:
Two carers on duty during the day,
Four carers on duty during the night,
Two carers on duty during mealtimes,
Two carers on duty during the day and four carers on duty during the night for residents who need help with personal care or who have dementia.