When2DriveSober

Estimate when you may be below your country's driving limit. Record drinks in seconds, track multiple people and follow your progress with clear countdowns and alerts.

This app helps you 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 Estimate

Understand how the estimate changes over time.

View: • Estimated BAC • Alcohol absorbed • Alcohol processed • Net change • Drinks added in each period • UK alcohol units • 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 faster 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 lower limit) • Europe / EEA • Switzerland • Norway • Canada • New Zealand • South Africa • Japan • Hong Kong

DESIGNED FOR REAL LIFE

• Quick to use • Native iOS design • iPhone and iPad 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 people 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 are shown to help support development and keep the app free.