An elderly man has been seriously injured after cutting his leg with a chainsaw on a property in remote central NSW.

The man in his 70s cut his leg while operating the chainsaw at a property at Maitland Bar, south of Mudgee, on Friday.

The Westpac Rescue Helicopter was called by NSW Ambulance to the property, where the man was treated before being flown to John Hunter Hospital in a stable condition.

It is likely he will require surgery.