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HEALTH TOOL

How Long Does Alcohol Take to Leave Your System? Calculator

Estimate UK alcohol units and an average processing duration from drink volume and ABV. Educational estimate, not a sobriety or driving test.

How Long Does Alcohol Take to Leave Your System? Calculator

FREE ONLINE TOOL

Not a personal clearance time. This is not time remaining since your last drink and cannot establish zero blood alcohol, sobriety, a negative test or fitness to drive.

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Uses an illustrative average of about one UK unit per hour. People may process alcohol more slowly or differently. No elapsed-time subtraction or “safe to drive” time is calculated.

If someone is unconscious, has a seizure or is breathing slowly or irregularly after drinking, contact local emergency services immediately.

Read the complete guide

NHS — Alcohol units

NIAAA — Alcohol metabolism

NHS — Alcohol poisoning

STEP BY STEP

How to use how long does alcohol take to leave your system? calculator

  1. Review the assumptions and example.
  2. Read the limitations before using the result.

IN PRACTICE

Example

Two 330 ml beers at 5% contain 3.3 UK units. At the illustrative average of one UK unit per hour, the total dose corresponds to about 3.3 processing hours.

GOOD TO KNOW

What are the limits of this tool?

UK units = volume in ml × ABV / 1000 × servings. One UK unit contains 10 ml (about 8 g) of alcohol. The NHS average of roughly one unit per hour varies between people. The result is not time remaining after your last drink, a zero-BAC prediction, test detection window or permission to drive.

Practical guides

How long does it take for alcohol to leave your system? →

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