When2DriveSober

Travel Tools and Tips

About this app

Estimate when your blood alcohol level may be below your selected country's driving limit.

Fully free to use — no subscriptions or hidden costs.*

Choose your country, record drinks and follow an estimated timeline showing how alcohol may change throughout the day or night.

The app focuses on timelines, transparency and cautious estimates, helping you understand how alcohol may rise and reduce over time using a safety-first approach.

View your estimated alcohol timeline, record drinks quickly and see estimated key times, including when you may be below your selected driving limit.

IMPORTANT

This app provides estimates only and should never be relied upon to determine legal fitness to drive.

FEATURES

Estimated BAC Timeline

• Visual alcohol timeline
• Estimated rise and reduction over time
• Local driving limit line
• Red / Amber / Green risk zones
• Key estimated times

Safety-First Calculations

• Conservative assumptions
• Upper drink strength used for ranges
• Food slows absorption timing rather than reducing alcohol
• Designed to avoid false reassurance

Detailed Alcohol Estimates

Understand how the estimate changes throughout your drinking session.

View:

• Estimated BAC
• Alcohol absorbed
• Alcohol processed
• Net alcohol change
• Drinks added during each period
• UK alcohol units
• Current risk status

Fast Drink Recording

Quick category-based drink logging:

• Beer / Lager / Cider
• Wine & Sparkling
• Spirits
• Cocktails / Mixed Drinks
• Food / Meals

Save favourite drinks for even faster drink logging.

Personal Profiles

• Optional profile setup
• Gender and build selection
• Advanced profile options
• Country-specific driving limits

Country & Regional Driving Limits

Includes support for:

• UK (including Scotland's lower limit)
• Europe / EEA
• Switzerland
• Norway
• Canada
• New Zealand
• South Africa
• Japan
• Hong Kong

DESIGNED FOR REAL LIFE

• Quick to use
• Designed for Android
• Android phone and tablet support
• Dark mode support
• Simple but detailed
• Safety-first approach

IMPORTANT DISCLAIMER

This app provides estimates only. It cannot determine legal or medical fitness to drive. Alcohol affects everyone differently. If you have been drinking, the safest option is not to drive.

*This app is fully free to use with no subscriptions or hidden costs. Small adverts may be shown to help support development and keep the app free.

What’s new

Added support for 14 languages.
Improved BAC calculations for long drinking sessions.
Enhanced favourites and drink recording.
Improved localisation and text handling throughout the app.
General bug fixes and performance improvements.