Radio remains a large-reach advertising medium, with 50.1 million UK adults tuning to their selected stations in an average week in Q3 2025. Effectiveness evidence also spans sales, revenue, brand response, attention and media allocation. The figures below combine UK and US studies, so their definitions, dates and geographies should be kept distinct.
Contents
- Radio audience reach and listening contexts
- Digital radio delivery and platform reach
- Sales lift and revenue ROI
- Brand awareness, consideration and response
- Radio budget allocation and media-mix ROI
- Creative context, attention and memory
Radio audience reach and listening contexts
RAJAR’s Q3 2025 data release recorded 50.1 million UK adults aged 15+ tuning to their selected radio stations in an average week. That represented 86% of the UK adult population aged 15+. Across the same quarter, UK radio listening averaged 1.022 billion hours per week, while an individual radio listener averaged 20.4 hours of live radio per week.
The listening environment matters when considering how an audio advertisement may be encountered. Ofcom’s Audio Listening in the UK 2025 reported 11.5 million UK adults listening to radio only in a car, van or lorry each week in Q1 2025. That was 20% of UK adults. Exclusive in-car radio listening increased 47% from Q1 2020 to Q1 2025, rising from 7.8 million to 11.5 million adults per week.
Vehicle listening has also grown over a longer period. Weekly radio listening in cars, vans and lorries reached 266 million hours in Q1 2025, 55% above the 172 million hours recorded in Q1 2005. At-home listening moved in the opposite direction: it fell 13%, from 733 million hours in Q1 2005 to 636 million hours in Q1 2025. Cars, vans and lorries accounted for 26% of live radio listening in Q1 2025, up 4 percentage points over the previous decade.
These figures describe audience scale and context rather than a guaranteed advertising outcome. Reach, hours and exclusive in-car listening are exposure opportunities; they are not interchangeable with sales lift or return on ad spend.
Digital radio delivery and platform reach
Radio’s delivery is increasingly digital. RAJAR measured 44 million UK adults aged 15+ reaching radio weekly through a digitally enabled platform in Q3 2025. Digital radio reached 76% of the UK adult population weekly, and digital listening accounted for 754 million radio hours in an average UK week.
The distribution of digital listening hours was led by DAB, which represented 56% of UK digital radio listening hours in Q3 2025. Smart speakers represented 25%, websites and apps 16%, and digital television 3%. Across all platforms, digital platforms carried 74% of total UK radio listening hours, while online listening accounted for 30% of total UK radio listening hours.
RAJAR’s questionnaire results add detail about device behaviour. Among smart-speaker users who answered the questionnaire, 64% used the device to listen to radio in Q3 2025, and 21% listened to radio on it every day. Among respondents, 29% listened to radio via a smartphone or tablet at least monthly.
| UK radio measure | Result | Measurement period |
|---|---|---|
| Weekly digitally enabled reach | 44 million adults aged 15+ | Q3 2025 |
| Digital weekly population reach | 76% | Q3 2025 |
| Digital share of total radio hours | 74% | Q3 2025 |
| Online share of total radio hours | 30% | Q3 2025 |
| Digital listening hours | 754 million per week | Q3 2025 |
The platform mix can help advertisers think about distribution and targeting, but these RAJAR figures remain audience and listening measures. They do not report campaign conversion or revenue.
Sales lift and revenue ROI
US evidence has linked radio exposure with measurable revenue outcomes, although the studies use specific brands, categories and periods. A Nielsen study of 2014 activity, published in 2015 in Radio’s Returns Have Advertisers Across Categories Tuning In, found that radio advertising could generate up to $17 in revenue per dollar spent, depending on the US retail category measured. Radio-exposed Hispanic consumers drove sales increases ranging from 9% to 49% across the retail categories measured.
Four US department-store brands averaged a 17-to-1 radio return on ad spend in Q3 2014. They invested $21 million in radio and generated $357 million in incremental revenue from exposed customers. Radio exposure delivered a 10% overall sales increase for those brands. Two US mass-merchandiser retailers achieved a 16-to-1 radio return on ad spend in Q4 2014 and generated more than $227 million in revenue above expectations from exposed customers. Two US home-improvement brands achieved a 9-to-1 return on ad spend in Q2 2014, investing more than $38 million in radio and generating nearly $370 million in incremental revenue from exposed customers.
A separate Nielsen Catalina Solutions analysis, described in For Advertisers, Radio is Worth Listening To, reported an average $6 in sales return for every $1 of radio ad spend during the 28 days after exposure across 10 US brands. Radio drove an average 5.8% of total sales across those brands. The mass-retailer brand had the highest radio contribution to total brand sales, at 15.1%.
Timing was associated with different brand-share results in that analysis. A purchase made within one day of radio exposure showed a 9% increase in brand share. When radio exposure occurred 28 days before purchase, the measured increase in brand share was 3.4%.
The findings are not a single universal benchmark. They are results from named US studies and should be interpreted with each study’s category, campaign period and outcome definition.
Brand awareness, consideration and response
The Big Audio Datamine from Radiocentre examined Radiogauge campaigns measured from 2008 to 2022. Across campaigns with the relevant measure, radio increased advertising awareness by an average of around 50%. Radio built positive brand sentiment by an average of up to 32%, depending on the sentiment measure used.
Purchase consideration also moved upward. Based on 828 campaigns, radio produced an 18% average uplift in purchase consideration among respondents highly likely to consider the advertised brand. This is a consideration result, not a direct sales or revenue estimate.
The same source reported actions among people who recalled hearing the radio advertisement. Of those respondents, 21% said they searched online for brand details, while 19% said they visited the brand’s website. The Big Audio Datamine said these search and website responses equated to an overall response rate of roughly 4% to 5% among exposed commercial-radio listeners.
These results use different denominators and stages of the customer journey. Awareness, sentiment, consideration, search, website visits and revenue should therefore be reported separately when evaluating a campaign. The Radiocentre results are industry-commissioned and should be read with their stated campaign and matched-listener designs.
Radio budget allocation and media-mix ROI
The Radio ROI Multiplier analysed a 2013 study dataset covering 464 observations. It found average revenue ROI of £7.70 for brands advertising on radio. Retail radio campaigns had the highest sector average in the dataset, with £18.90 in revenue returned per advertising pound.
The dataset also compared average revenue ROI with media-spend share:
| Medium | Average revenue ROI | Share of media spend |
|---|---|---|
| Radio | £7.70 | 5.8% |
| TV | £8.70 | 44.3% |
| Press | £5.80 | 18.1% |
| Outdoor | £2.00 | 11.7% |
| Online | £4.90 | 20.1% |
In the same modelling, moving budget from online into radio produced a 0.9% uplift in overall campaign ROI, with the model optimised when radio reached 11% of the total budget. Moving budget from press into radio produced a 2.4% uplift, optimised at a 14% radio share. Moving budget proportionately from online, press and TV into radio raised overall campaign ROI by 8.5% at a 20% radio share.
The Radio ROI Multiplier estimated more than £1.4 billion in untapped revenue for the top 100 UK advertisers if radio reached the modelled 20% share. This is a modelled scenario from the 2013 study dataset, not a current-market forecast.
A newer High Gain Audio analysis, published in 2026, used historical econometric datasets and modelled budget scenarios across six brands. It found total campaign short-term ROI was maximised when audio received 25% of total media spend, producing a 9% gain versus the no-audio mix. Because this is modelled evidence using historical datasets, it should not be treated as a universal allocation rule.
Creative context, attention and memory
Media placement is only part of effectiveness. Radiocentre’s Hear and Now study reported that listeners were participating in another activity on 90% of occasions while listening to radio. Creative therefore has to work in contexts where attention may be divided.
The top-performing contextually tailored radio advertisements achieved a 70% increase in engagement and a 40% increase in memory encoding. Across six situationally relevant advertisements, hearing the ad in a relevant context increased engagement by 23% versus the control context and increased memory encoding by 22%.
The study also placed situational test advertisements against a benchmark of 400 recent TV and radio campaigns. When heard in a relevant context, the test ads rose from the 53rd to the 94th percentile for memory encoding.
These results concern engagement and memory measures from the Hear and Now study. They do not establish a direct percentage increase in sales. Together with the reach, response and ROI findings above, they indicate that radio effectiveness can be evaluated across several stages: potential exposure, attention, memory, brand response, sales and revenue return.
The evidence spans UK and US studies and uses different outcome definitions. Revenue ROI, profit ROI, sales lift, brand-response uplift, listening reach and hours are not interchangeable. Older studies are reported with their original measurement periods, while High Gain Audio is a 2026 publication using historical econometric datasets and modelled budget scenarios.