Know your blood alcohol content, and your actual legal limit
Most calculators give you one generic number against a flat 0.08%. This one logs your real drinks, picks the legal limit for your state or country, and tracks your BAC live until you're clear.
● 3 calculation models ● State and country legal limits ● Live BAC curve
Method
Three inputs, one accurate reading
Pick your calculation model, log what you actually drank, and set your region. Everything else updates on its own.
01
Enter your details
Weight, sex, and optionally height or body fat percentage, so you can choose Classic Widmark, Watson body-water, or the body fat model.
02
Log your drinks
Add each drink with its own type, size, and time, not one lump total. Mark whether you ate, since food changes absorption speed.
03
Read your result
See your live BAC, your peak, and the exact time you’ll be under your selected legal limit or fully back to zero.
Your jurisdiction
Compared against your actual legal limit
Most tools show one flat number. Select your region in the calculator and your BAC is measured against the real limit that applies to you.
Standard driver, US
0.08%
Commercial driver, US
0.04%
Under 21, US
0.00–0.02%
Utah
0.05%
UK and most of EU
0.05%
Hungary, Czechia
0.00%
Australia
0.05%
Canada
0.08%
Reference
What each BAC level feels like
Your live result is automatically matched to the row below, so you never have to cross-reference it yourself.
BAC
Status
Typical effects
0.00
SOBER
No measurable impairment.
0.01–0.02
MINIMAL
Slight mood lift, barely noticeable.
0.03–0.05
MILD
Relaxation, lowered inhibitions.
0.06–0.07
IMPAIRED
Slower reaction time, judgment starts to slip.
0.08–0.09
LEGALLY IMPAIRED
Illegal to drive in most of the US. Noticeable balance and speech issues.
0.10–0.15
SEVERE
Major coordination loss, blurred vision.
0.16–0.25
DANGER
Nausea, confusion, blackout risk.
0.26+
LIFE-THREATENING
Risk of alcohol poisoning, loss of consciousness.
While you wait
Live tracking, not a one-time guess
Your BAC updates automatically as time passes, with a full curve showing where you’ve been and where you’re headed.
Peak
Peak BAC and timing
See the highest point your BAC is projected to reach, and roughly when.
Countdown
Time to legal limit
A running countdown to when you’re under your selected region’s limit.
Curve
Full session chart
A live line chart of your rise and fall, with your legal limit marked directly on it.
!
Over your limit? We say so plainly.
When your estimated BAC crosses your selected legal limit, the result includes a direct next step, how long to wait, or a reminder to arrange a ride, not just a colored badge left for you to interpret.
Your results
Keep a record, or share it in one tap
PDF
Download a full report
Session summary, BAC chart, drink timeline, and the assumptions used, formatted and ready to save.
TXT
Copy a quick summary
One click copies a plain-text version of your result to your clipboard.
IMG
Share a result card
A clean, simple snapshot of your BAC and status, easy to send in a message.
It’s a solid estimate, generally within 15 to 20% of an actual breath or blood test. Choosing the body fat percentage model and entering food intake accurately gets you closer to a realistic number.
It depends on your weight, sex, and how fast you’re drinking. Log your actual drinks in the calculator for a number based on your real session rather than a rough average.
Food eaten before or during drinking can lower your peak BAC by slowing absorption, which is why our calculator has a food toggle. Coffee and water do nothing to speed up how fast your liver clears alcohol already in your blood.
Classic Widmark is the standard formula most calculators use. Watson body-water is a refinement that’s generally more accurate for most adults. Body fat percentage is the most precise, since it accounts for your actual lean-to-fat ratio.
No. This tool is for education and awareness. It’s not a certified device and shouldn’t be the deciding factor in whether you drive. If you’ve been drinking, the safest choice is not to.