Blood Alcohol Estimator
The mass of pure alcohol is divided by body weight and a body-water factor. Alcohol clears at roughly 0.015% per hour, so the time to reach zero is shown too.
Your numbers
BAC
0.041%
Result
19.7g
Time to clear
2.8h
What it means
An estimated 0.041% exceeds Korea’s 0.03% driving limit — do not drive.
Formula
BAC = Volume (mL) × ABV (%) ÷ 100 × 0.789 ÷ (Weight (kg) × r) ÷ 10, r = 0.68 (M) · 0.55 (F)
Individual variation is very large. This must never be used to decide whether you can drive — if you have been drinking, do not drive.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Volume (mL)How much drink went down; with the strength it gives pure alcohol. | 500 | 10 ~ 3,000 |
| ABV (%) (%)The share of the drink that is alcohol, by volume. | 5 | 0.5 ~ 60 |
| Weight (kg)The second weight you are comparing against. | 70 | 20 ~ 200 |
| Sex (M1 / F0)Where the formula splits by sex — enter 1 for male, 0 for female. | 1 | 0 ~ 1 |
Step by step
Quick reference table
Results when only Volume (mL) changes and everything else stays put.
| Volume (mL) | BAC (%) | Result (g) | Time to clear (h) |
|---|---|---|---|
| 250 | 0.021 | 9.9 | 1.4 |
| 375 | 0.031 | 14.8 | 2.1 |
| 500 | 0.041 | 19.7 | 2.8 |
| 750 | 0.062 | 29.6 | 4.1 |
| 1,000 | 0.083 | 39.5 | 5.5 |
What each result means
| Result | At default values |
|---|---|
| BAC (%)Alcohol by weight in 100 mL of blood. | 0.041 |
| Result (g)What the formula gives back — the answer this page is for. | 19.7 |
| Time to clear (h)Hours until the alcohol clears; it varies a lot by person. | 2.8 |
Common mistakes
Individual variation is very large. This must never be used to decide whether you can drive — if you have been drinking, do not drive.
Glossary
- Volume (mL)
- How much drink went down; with the strength it gives pure alcohol.
- ABV (%)
- The share of the drink that is alcohol, by volume.
- Weight (kg)
- The second weight you are comparing against.
- Sex (M1 / F0)
- Where the formula splits by sex — enter 1 for male, 0 for female.
- BAC
- Alcohol by weight in 100 mL of blood.
- Result
- What the formula gives back — the answer this page is for.
- Time to clear
- Hours until the alcohol clears; it varies a lot by person.
Frequently asked questions
Q. How is Blood Alcohol Estimator calculated?
BAC = Volume (mL) × ABV (%) ÷ 100 × 0.789 ÷ (Weight (kg) × r) ÷ 10, r = 0.68 (M) · 0.55 (F) — The mass of pure alcohol is divided by body weight and a body-water factor. Alcohol clears at roughly 0.015% per hour, so the time to reach zero is shown too.
Q. Can you walk through an example?
With Volume (mL) 500, ABV (%) 5%, Weight (kg) 70, Sex (M1 / F0) 1, the answer is BAC 0.041%.
Q. What do I need to enter?
Enter Volume (mL), ABV (%), Weight (kg), Sex (M1 / F0). The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Volume (mL) moves the answer to Volume (mL) 250 → BAC (%) 0.021 and Volume (mL) 1,000 → BAC (%) 0.083. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Individual variation is very large. This must never be used to decide whether you can drive — if you have been drinking, do not drive.
Related calculators
These calculators help you understand health figures; they do not replace diagnosis or prescription. See a clinician if you have symptoms.