Jak Brian Billing appeared in the Launceston Magistrates Court on Wednesday.

Appearing before Magistrate Ken Stanton, Billing pleaded guilty to driving while exceeding prescribed alcohol limit and a person mentioned in section 6 (3).

In May the 19-year-old man was driving his white Toyota Hilux on the night of his grandfather's funeral when he was intercepted by police on Lawrence Vale Road at South Launceston.

Police conducted a random breath test with Billings and he returned a blood alcohol reading of 0.207, which is four times the legal limit of a fully licenced driver.

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As a provisional licence holder Billing was required to have a blood alcohol reading of zero.

The court heard he started drinking about 8pm, consuming seven beers and five Cruisers in the hours before he drove because he was at his grandfather's funeral.

The P-plater had two passengers in the car and had planned to drive from Launceston to Riverside, but was intercepted by police before reaching his destination.

The Prospect Vale man declined a blood test and police issued him with an excessive drink-driving notice.

Billing told the court he'd had a hard think about what he did and knew it was the wrong thing to do.

"I know it's not an excuse but it was my pop's funeral that day, that's why I was drinking," he said.

Billing said he hadn't consumed any alcohol since the incident.

The court also heard Billing worked full time.

Magistrate Stanton said the reading was astonishingly high.

"I'm thinking of sending you to jail," he said.

Magistrate Stanton did not sentence Billing on Wednesday because he wants the drink driver to undergo a pre-sentence report first.

Billing was bailed to reappear at the Launceston Magistrates Court for sentencing on July 24.