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Standard Drink Calculator

Convert any drink into standard drinks and grams of pure alcohol, using the US, UK, Australian, Canadian or WHO definition.

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Am I Overweight? CalculatorFind out if you're overweight from your BMI, with your healthy weight range and kg to reach it.Am I Underweight? CalculatorFind out if you're underweight from your BMI, with your healthy weight range and kg to reach it.Biological Age CalculatorEstimate your biological age from lifestyle factors — fitness, diet, sleep, stress and more. Educational, not medical.Body Frame Size CalculatorSmall, medium or large frame from your height-to-wrist ratio, with a frame-adjusted weight range.Bra Size CalculatorBand and cup size (US, UK and EU) from your underbust and bust measurements.Child BMI Percentile CalculatorBMI-for-age percentile on the CDC reference, ages 2-20 — the percentile, not the BMI, is what counts for a child.Height Percentile CalculatorWhere your height sits against the US adult reference, with the z-score and standard-deviation band.Keto CalculatorCompute your keto macros (fat, protein, net carbs) from BMR/TDEE and your keto diet type.

Open Standard Drink Calculator and you get an answer straight away, with no account to create. You will find it under Weight & body, with Am I Overweight? Calculator and Am I Underweight? Calculator for the neighbouring cases.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Standard Drink Calculator do?

Convert any drink into standard drinks and grams of pure alcohol, using the US, UK, Australian, Canadian or WHO definition.

When would I actually use this?

Getting a reference point before a check-up, setting a realistic target, and understanding why two people of the same weight can be in very different shape — and, the same act from the other side, putting a day's caffeine, salt, sugar or alcohol beside the ceiling a health body publishes for it.

What is the most common mistake?

Reading BMI as a measure of health. It cannot tell muscle from fat, which is why athletes routinely score as overweight and why it says little about an individual.

Is there a tool for the next step?

Am I Underweight? Calculator is the closest one after this: Find out if you're underweight from your BMI, with your healthy weight range and kg to reach it.

What else is worth having open alongside it?

Biological Age Calculator and Body Frame Size Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

The formulas are the published ones (Quetelet for BMI, Mifflin-St Jeor or Harris-Benedict for energy expenditure) and the tool names which it used. None of this is a diagnosis or a substitute for a clinician.

Further reading

All guides →
ExplainerWhat a Standard Drink Actually IsA standard drink is a defined mass of ethanol — and the definition changes at the border. The same glass of wine is 1.28 drinks in the United States, 1.79 in France and 2.28 in the United Kingdom.ExplainerBlood Donation Intervals, and What Your Body Is Actually ReplacingPlasma is back in a day, red cells in weeks, iron in months — and it is the iron that sets the interval. The arithmetic of a unit, and the minimum intervals published by seven national services.ExplainerThe Calories in a Drink Are Mostly the AlcoholEthanol carries 7 kcal per gram and the arithmetic is exact: volume × ABV × 0.789 × 7. A dry spirit is almost pure alcohol calories; a liqueur is nearly half sugar. Here is the derivation, the table, and the metabolic caveat stated without overclaiming.ExplainerNap Length Decides What You Get — Not How Tired You WereA nap's effect depends on which sleep stage the alarm interrupts, and length is the only part of that you control. What 10, 20, 30 and 90 minutes actually do, with the arithmetic for the alarm.ExplainerHow Long Until You Are Sober? Zero-Order Elimination ExplainedAlcohol leaves the body at a roughly constant mass per hour, whatever the concentration. That one property — zero-order elimination, unlike caffeine's exponential decay — explains why doubling the dose doubles the time, why nothing speeds it up, and why every estimate carries a wide error bar. With the Widmark relation worked through, and each market's legal limit stated separately.ExplainerAm I Overweight? Why One Number Cannot SayBMI reads muscular bodies as heavy and cannot see where fat sits at all — which is exactly why the waist measures exist. Here are the published waist and waist-to-height thresholds, a worked case where BMI and waist give opposite answers, an honest account of the contested mortality curves, and the 2025 shift toward defining obesity by adiposity and organ function rather than by a ratio.