Blood Alcohol Estimator
Estimate blood alcohol concentration — a rough guide only, never a safe-to-drive test.
A very rough estimate
Blood alcohol concentration estimators use factors like drinks, body weight, sex and time to give a rough approximation of BAC. This provides such an estimate — but it comes with a serious warning about how little it should be relied upon, because the reality is far more variable than any formula.
Enter the details for a rough estimate only.
Never use this to decide whether to drive
This must be said plainly: a BAC estimate is genuinely unreliable for any real decision, and it should never, under any circumstances, be used to judge whether you are safe or legal to drive. Actual blood alcohol depends on many factors a formula cannot capture — your metabolism, food, medications, health, the exact drinks — so your real level could be substantially higher than any estimate, and impairment begins before legal limits. The only safe rule is simple: if you have been drinking, do not drive. Wait, arrange another way home, or do not drink if you need to drive. This is general information for curiosity only, not a safety tool, and no estimate is a substitute for that rule.
Blood Alcohol Estimator FAQ
Can I use this to decide if I'm safe to drive?
No — never. A BAC estimate is unreliable, your real level could be much higher, and impairment begins before legal limits. If you have been drinking, do not drive.
Why is BAC so hard to estimate?
It depends on metabolism, food, medications, health and the exact drinks — factors no formula can capture, so any estimate is very rough.
What is the safe rule?
If you have been drinking, do not drive. Wait, arrange another way home, or do not drink if you need to drive. No estimate replaces that.