Want to know how many calories you're consuming when you drink a couple of glasses or wine or a cocktail or two before dinner? Sorry, the government doesn't require that kind of information to be displayed on the label.

But the Consumer Federation of America says consumers who drink alcohol should have that information. It's assembled Alcohol Facts, a side-by-side comparison of the alcohol, calorie and carbohydrate content per serving of the 26 top selling domestic and imported alcohol brands.

Designed to help consumers follow the advice that men limit their consumption to two drinks a day and that women restrict their consumption to one drink per day, Alcohol Facts further explains what constitutes a "standard drink" -- 12 ounces of regular beer, 5 ounces of wine and 1.5 ounces of 80-proof (40%) distilled spirits.

According to the government's dietary guidelines, these amounts represent moderate drinking. Public health officials warn that consuming too much alcohol contributes to dependence, obesity and a range of diseases, such as liver cirrhosis and cancers of the upper gastrointestinal tract.

"Right now, consumers really have no way of knowing the most basic information about alcoholic beverages," said Chris Waldrop, Director of the Food Policy Institute at the Consumer Federation of America. "It's time to end the confusion so consumers can make informed and responsible purchasing and consumption decisions. We're making information available today on some of the top selling brands, but the federal government needs to require standardized and complete alcohol labeling on all alcoholic beverages."

Based on liquor industry sales data compiled by Adams Beverage Group, CFA's analysis focused on 26 top-selling alcohol brands, comprising 13 beers and flavored malt beverages, 8 spirits products (vodka, rum, whiskey, gin and tequila), and 5 brands of wine.

Using the standard serving size for each category, CFA found the alcohol per serving ranged from 0.42 fluid ounces to 0.70 fluid ounces depending upon the specific brand and type of alcoholic beverage. In contrast, calorie and carbohydrate content varied significantly among the categories and bands as follows:

• Among spirits, calories per serving ranged from 86 calories for spiced rum to 120 calories for gin. The average (not including mixers) was 98 calories per serving;

• For wines, calories per serving ranged from 105 calories for a merlot to 125 calories for a cabernet sauvignon. The average was 118 calories per serving;

• The greatest variation in calories occurred among beers and flavored malt beverages. Light beers (5 brands) averaged 100 calories per serving, regular beers averaged 140 calories (5 brands) per serving, and the flavored malt beverages (3 brands) ranged from 190 calories per serving to 241 calories per serving;

• Variations were greatest when analyzing carbohydrate levels. Compared to no carbohydrates in spirits, wines ranged from 0.8 grams per serving for chardonnay to 5.0 grams per serving for cabernet sauvignon. Among different beers and malt beverages, carbohydrates ranged from 3.2 grams per serving for light beer to 38 grams per serving for a flavored malt beverage.

"Consumers should not have to search out information on website pages to figure out what is in their drink," Waldrop said. "The fact that this information wasn't readily available underscores why Americans need the same helpful and easily accessible labeling information on alcoholic beverages that is now required for conventional foods, dietary supplements, and nonprescription drugs."