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Timeline view
See how your estimated alcohol level may rise and fall over time, instead of only seeing one number.
Safety-first • Estimate only • Built for planning ahead
Estimate when alcohol may have left your system.
When2DriveSober helps you record drinks, view an estimated BAC timeline and understand when your estimate may fall below your selected local driving limit.
Important: This app provides estimates only. Never rely on it to decide whether you are legally or medically fit to drive. If you have been drinking, the safest choice is not to drive.
- ✓ Timeline-based alcohol estimate
- ✓ Red, amber and green risk states
- ✓ Local driving limits by country/region
- ✓ Cautious calculations, not optimistic ones
Designed as a practical planning tool, not a legal driving decision tool.
Designed to reduce false confidence
The app intentionally presents alcohol estimates cautiously. It is better to slightly overestimate risk than underestimate it.
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Safety-first estimates
Drink ranges use cautious values, and warnings make clear that the app cannot prove you are fit to drive.
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Local limits
Choose your country or region, including separate limits for England/Wales/Northern Ireland and Scotland.
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Fast drink logging
Record beer, wine, spirits, cocktails and meals quickly using a simple category-first flow.
See the app in action
A simple release-one website: the key point is to explain the timeline, the drink logging flow and the safety warning clearly.
Estimated BAC timeline
Shows drink markers, legal limit line, risk colours and key estimated times.
Record drinks quickly
Choose a category and add drinks in a few taps during a real evening out.
Understand the estimate
Review half-hourly changes including drinks added, absorption, processing and net change.
Clear colour states
The app uses red, amber and green to make the timeline easy to understand, while still warning that green is not a guarantee of fitness to drive.
Red
Estimated over the selected driving limit.
Amber
Close to the limit. The app treats this as higher risk.
Green
Estimated lower risk, but not a guarantee that you are safe to drive.