President Donald Trump's approval rating jumped to a seven-month high on Friday following a State of the Union address that was widely received as a success.

The Rasmussen Reports daily tracking poll shows 49 per cent of likely U.S. voters believe Trump is doing a good job in the White House. The same number disagree.

The last Time the poll put Trump's number so high was in mid-June of last year.

The 49 per cent number puts him above his performance level in the 2016 election, when 46.1 per cent of voters chose him over Hillary Clinton and a handful of minor candidates.

President Donald Trump's approval rating is up to 49 per cent in a new Rasmussen poll, his best showing since last June

Rasmussen also calculates an 'approval index' based on the numbers of voters who say they 'strongly' approve of disapprove of the president.

Thirty-five per cent were in the 'strongly approve' column, and 38 per cent told pollsters they 'strongly disapprove' of Trump.

The difference, -3, is Trump's best showing since the beginning of March 2017.

The Rasmussen poll shows a spike this week (at right), the highest level in more than seven months

Rasmussen was among the few national polls that accurately predicted the election outcome which vaulted Trump to power.

Unlike other polls that ask questions in live telephone interviews, it relies on push-button phone calls – meaning voters who like Trump's performance in office aren't required to say so out loud to another person.

Some political scientists have called the result 'The Trump Effect,' a phenomenon that explained how social distaste for the president might depress his numbers in polls that use live operators.

The 49 per cent number puts him above his performance level on Election Day in 2016, when 46.1 per cent of voters picked him

The poll also measures an 'approval index' which now shows only a 3-point gap between voters who 'strongly disapprove' and 'strongly approve of the president

It's possible that Monday's overall approval will climb even higher than 49 per cent.

The Rasmussen poll is a three-day rolling average published on weekdays; Friday's release only includes two days' polling after Trump's State of the Union triumph.

A CBS poll conducted Tuesday evening showed that 75 per cent of Americans who watched the speech liked what they heard.

Earlier in the week when Rasmussen asked voters whether Trump would keep the promises he made in his address, a majority said he was more likely to do so than other presidents.