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The pH of vinegar depends upon how much acid is present in it. The most commercial distilled white vinegars contain 5% acetic acid, and hence, has a pH value that ranges between 2.40 - 3.40. More Information on Vinegar and its pH Levels. Though vinegar is available in different varieties, apple cider vinegar is the most commonly used example, which is prepared from apple cider.
The scale used to measure acidity is the pH scale. Water is pH 7 (ish) and as things get more acidic then the pH number gets lower. It's a log 10 scale, so 6 10x more acidic than 7 and 5 is 10x more acidic than 6. This would place vinegar in at about the pH 2-3 range. That's about the same a lemon juice, or even more scary, about the same as many popular fizzy drinks.