What this calculator does
The Tipsy Drink Amount Calculator estimates the volume of an alcoholic beverage a person should drink to reach and then hold a pleasant "tipsy" or buzzed feeling for a chosen number of hours. You enter your body weight, the drink's alcohol content (ABV), and how long you want the gentle buzz to last; it returns an amount in milliliters. This is a Japanese novelty rule-of-thumb, popularised by Makoto Sato in his book on enjoying sake (Kodansha). It is for entertainment only and applies the same simple arithmetic everywhere, so no country setting is needed.
How to use it
Type your body weight in kilograms, the drink's ABV as a plain number (wine ≈ 15, beer ≈ 5, spirits ≈ 40), and the number of hours you want to stay pleasantly tipsy. The result is the total drink volume. The breakdown shows the "initial dose" needed to reach the buzz and the extra "maintenance" volume for each hour beyond the first.
The formula explained
Drink amount (ml) = $$V = \frac{1000 \cdot W}{A \times 12} + \frac{15 \times W}{A}\,(N - 1)$$ where \(W\) is weight in kg, \(A\) is the alcohol percent and \(N\) is hours. The first term reaches the tipsy state; the second adds volume to maintain it. For \(N\) below 1 the second term goes negative, a known quirk of the formula, so the displayed result is clamped to zero or above.
Worked example
For a 60 kg person drinking beer (5% ABV) over 3 hours: initial dose = \(60000 / 60 = 1000\) ml, maintenance = \((900 / 5) \times 2 = 360\) ml, total = \(1360\) ml.
FAQ
Is this a safe-drinking or legal limit? No. It is a novelty estimate and ignores tolerance, metabolism, food and health. Never use it to judge whether you can drive.
Why are the numbers sometimes huge? The rule-of-thumb is crude and can overstate volumes; treat it as fun, not fact.
What ABV should I enter? The drink's percentage by volume as printed on the label, e.g. 15 for wine, 5 for beer, 40 for spirits.
