If you’ve recently been arrested for DWI and you’re wondering what your blood alcohol level was when you blew into the breath test machine, it matters how much you’ve had to drink, what your body weight is and the length of time you’ve been drinking.

You level can be estimated by the following:

1. Count your drinks (1 drink equals 1 ounce of 100 proof liquor, one 5 ounce glass of table wine or one 12 ounce bottle of regular beer).
2. Use the chart below and under the number of “drinks” and opposite “bodyweight”: find the percent of blood alcohol listed.
3. Subtract from this number the percent of alcohol :burned up” during the time elapsed since your first drink.  This figure is .015% per hour.

(Example:  180 lb. man – 8 drinks in 4 hours/.167% minus (.015×4): .107%