Voters have branded the federal budget the worst in more than 20 years, two new polls show.

The latest Newspoll published in The Australian newspaper shows 69 per cent of respondents think they will be worse off under the measures announced by Treasurer Joe Hockey last week.

Households earning between $50,000 and $90,000 were the most pessimistic.

Only 39 per cent said the budget was for the good of the country, according to the survey.

Similar sentiments were reflected in a Fairfax-Nielsen poll, with 74 per cent saying they will be worse off and 63 per cent branding the budget unfair.

The Australian says the poll is the worst result for any coalition budget on record, with only five per cent saying they will be better off.

The federal government has come under fire from across the community in the past week as it tries to sell measures including tax rises on petrol, a $7 fee to visit the GP, a crackdown on welfare measures and $80 billion in cuts to health and education.