Frequency in Meta Ads is the average number of times each person in your audience saw your ad over a given period. It is worked out by dividing impressions by reach: if an ad was shown 30,000 times to 10,000 different people, its frequency is 3.0.
How frequency works
Ads Manager reports frequency for any campaign, ad set or ad, and for any date range you choose. Because it is an average, a frequency of 3 can hide a wide spread: some people saw the ad once, while others saw it eight or nine times. Frequency over the lifetime of a campaign will always be higher than frequency over the last seven days, so compare like with like.
Most campaigns do not let you set frequency directly. Meta decides how often to show an ad based on your objective, budget and audience size. The exceptions are campaigns using the Reach objective, where you can set a frequency cap such as “no more than twice every seven days”, and reach and frequency buying, where you agree reach and frequency in advance at a fixed price.
Frequency rises when the budget is large relative to the audience. Spend £50 a day on an audience of 20,000 people and the same faces will see your ads again and again; spend the same amount across 2 million people and most will see them once or not at all.
Why it matters for a UK business
Some repetition helps. People rarely act on the first sight of an ad, and seeing a brand two or three times builds familiarity. Too much repetition wastes money and irritates people: click-through rate falls, cost per result rises, and negative feedback such as “hide ad” can increase. That decline is usually called creative fatigue.
Frequency climbs fastest for small audiences, which is common in UK local advertising. A dog groomer targeting a few miles around Guildford, or a retargeting campaign for a small site, can show the same ad to the same people many times a week without anyone noticing until results drop.
There is no single safe number. Retargeting a warm audience can tolerate higher frequency than prospecting to strangers, and a short sale can justify more repetition than an always-on campaign.
Common mistakes
- Looking at lifetime frequency only, which hides a sharp rise in the last week.
- Treating any frequency above a magic number as bad without checking whether results have actually dropped.
- Putting a large budget behind a tiny local or retargeting audience.
- Responding to high frequency by raising the budget, which makes it worse.
- Running one ad for months with no new creative behind it.
How to act on it
Add frequency, click-through rate and cost per result as columns in Ads Manager and look at them over the last seven days and the last 30. If frequency is climbing while click-through rate falls and cost per result rises, the audience is tiring of the ad.
Fixes, in rough order: add fresh creative, widen the audience or location, lower the budget to fit the audience size, or set a frequency cap where the objective allows it. When planning, the reach and frequency calculator gives a rough idea of how often a budget will reach an audience. Watching for audience saturation like this is a weekly task in the Facebook and Instagram ads management I provide.