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ATTORNEY RONALD F. STEVENS

 

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How To Calculate Your Estimated
Blood Alcohol Content (BAC)

Showing estimated percent of alcohol in the blood by number of drinks in relation to body weight. This percent can be estimated by:

1. Count your drinks (1 drink equals 1 ounce of 100-proof liquor, one five ounce glass of table wine or one 12-ounce bottle of regular beer).

2. Use the chart below and under number of "drinks" and opposite "body weight" 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 (.015x4) = .107 %

 

(Scroll down for chart)

  

DRINKS

Body weight

1

2

3

4

5

6

7

8

9

10

11

12

100 lb.

.038

.075

.113

.150

.188

.225

.263

.300

.338

.375

.413

.450

110 lb.

.034

.066

.103

.137

.172

.207

.241

.275

.309

.344

.379

.412

120 lb.

.031

.063

.094

.125

.156

.188

.219

.250

.281

.313

.344

.375

130 lb.

.029

.058

.087

.116

.145

.174

.203

.232

.261

.290

.320

.348

140 lb.

.027

.054

.080

.107

.134

.161

.188

.214

.241

.268

.295

.321

150 lb.

.025

.050

.075

.100

.125

.151

.176

.201

.226

.251

.276

.301

160 lb.

.023

.047

.070

.094

.117

.141

.164

.188

.211

.234

.258

.281

170 lb.

.022

.045

.066

.088

.110

.132

.155

.178

.200

.221

.244

.265

180 lb.

.021

.042

.063

.083

.104

.125

.146

.167

.188

.208

.229

.250

190 lb.

.020

.040

.059

.079

.099

.119

.138

.158

.179

.198

.217

.237

200 lb.

.019

.038

.056

.075

.094

.113

.131

.150

.169

.188

.206

.225

210 lb.

.018

.036

.053

.071

.090

.107

.125

.143

.161

.179

.197

.215

220 lb.

.017

.034

.051

.068

.085

.102

.119

.136

.153

.170

.188

.205

230 lb.

.016

.032

.049

.065

.081

.098

.115

.130

.147

.163

.180

.196

240 lb.

.016

.031

.047

.063

.078

.094

.109

.125

.141

.156

.172

.188

[Created from NHTSA chart, with modifications]

Attorney William C. Head