What is Weekly Reach in Radio?
Weekly reach (often abbreviated as W1) measures the total number of unique individuals exposed to a radio station or campaign at least once during a seven-day period. It's expressed as both an absolute figure (number of listeners) and a percentage of the target population.
Unlike daily reach, which captures a single day's audience, weekly reach provides a broader picture of how many people a campaign touches across a full week. This metric accounts for listening patterns throughout the week, including those who tune in on different days.
Why Weekly Reach Matters
Weekly reach is fundamental to radio planning because it reflects cumulative audience exposure over realistic listening cycles. Most UK listeners don't tune in daily – listening habits vary by day of week, with weekday commute times and weekend leisure periods creating distinct patterns.
For media buyers, weekly reach helps:
- Assess campaign penetration: Understand what proportion of your target audience you'll reach with a given media plan
- Compare stations and formats: Evaluate which stations deliver the broadest audience within your demographic
- Justify frequency levels: Determine how many spots are needed to achieve desired reach and frequency goals
- Optimize budgets: Balance reach against frequency to maximize ROI
Weekly Reach vs. Other Metrics
Weekly reach differs from daily reach (smaller, concentrated audience) and cumulative reach over longer periods (four weeks, thirteen weeks). It sits at the sweet spot for most commercial radio planning in the UK, aligning with how media is typically purchased and reported.
Reach is also distinct from impressions – reach counts unique people once, while impressions count total ad exposures, which can be much higher with frequency.
Using Weekly Reach in Planning
UK media planners use weekly reach data from RAJAR (Radio Joint Audience Research) and other audience measurement tools. When building a radio schedule, planners will specify reach targets: "We want to reach 70% of ABC1 adults weekly," for example.
Reach and frequency work together. A plan might achieve 60% weekly reach with an average frequency of 5 (meaning 5 spot opportunities per listener, on average). Higher frequency on fewer stations creates concentrated reach; spreading spots across multiple stations increases reach but may reduce frequency.
Practical Application
For a UK FMCG brand launching a product, weekly reach ensures broad awareness building. For a local service business, concentrated reach on one or two stations might be more cost-effective. The right weekly reach target depends on campaign objectives, budget, and competitive context.