Pure Alcohol Intake Calculator
＋More features: total for several drinks, time to break down the alcohol
Total up a whole drinking session
If you had several drinks, just pick the drink type (or type the amount and ABV by hand) — up to 5 rows are totaled instantly.
How long until the alcohol is broken down?
Estimates roughly how many hours after your last drink, using a breakdown rate of body weight × 0.1 g per hour (if the amount is blank, the result above is used).
The breakdown rate is a rough average with large individual and day-to-day differences — never use “the calculation says it is zero, so I can drive” as a judgment.
Just enter the amount and ABV of a drink to see how much pure alcohol enters your body. It also checks whether you reach the “risk-raising amount” defined in the national guideline of Japan’s Ministry of Health, Labour and Welfare — the benchmark used in Japan. Useful for reviewing your evening drinks.
How to use
- Enter the amount of alcohol you drank (or plan to drink) in mL.
- Enter the drink’s alcohol by volume (%) — it is printed on the can or bottle label.
- As you type, the pure alcohol amount and the risk check appear right below. No button needed.
How it is calculated
- Pure alcohol (g) = amount (mL) × ABV (%) ÷ 100 × 0.8 (the specific gravity of alcohol)
Example: 500 mL of beer (5%) = 500 × 0.05 × 0.8 = 20 g - Standard drinks = pure alcohol ÷ 10 (the internationally used unit of 1 drink = 10 g of pure alcohol)
The risk check uses the drinking amount that raises the risk of lifestyle-related diseases (pure alcohol per day) defined in the “Guidelines on Health-Conscious Drinking” of Japan’s Ministry of Health, Labour and Welfare.
| Category | Pure alcohol |
|---|---|
| Amount that raises lifestyle-disease risk (men) | 40 g or more |
| Amount that raises lifestyle-disease risk (women) | 20 g or more |
Sources (primary information)
- Ministry of Health, Labour and Welfare (Japan), e-Health Net “Units of alcohol consumption” — formula and drink conversion, in Japanese
https://kennet.mhlw.go.jp/information/information/alcohol/a-02-001.html (accessed July 18, 2026) - Ministry of Health, Labour and Welfare (Japan), “Guidelines on Health-Conscious Drinking” — basis of the risk check, in Japanese
https://www.mhlw.go.jp/stf/newpage_38541.html (accessed July 18, 2026)
Assumptions and notes
- The “risk-raising amount” is a statistical benchmark for the risk of developing disease — it does not mean anything below it is safe. For some conditions (such as high blood pressure), risk rises even with small amounts of alcohol.
- The speed at which alcohol is broken down varies greatly between individuals; the same amount affects different people differently.
- In Japan, drinking under the age of 20 and drink-driving are prohibited by law.
Frequently asked questions
I hold my drink well — can I drink more?
“Not getting drunk easily” and “less health impact” are different things. Lifestyle-disease risk depends on the amount of pure alcohol, so even people with a strong constitution need to manage the amount.
How many hours until the alcohol leaves my body?
The breakdown speed varies enormously with build and constitution, so this tool does not judge it for you. Never drive on the basis of “it should be out of my system by now”.
Why does even one canned chuhai count as a risk?
A high-alcohol canned chuhai (9%, 500 mL) contains 36 g of pure alcohol — about 1.8 medium bottles of beer. Because the result depends on both ABV and volume, high-ABV drinks add up even in small amounts.