Why a reporting window defines micro influencer campaign metrics

What to take away

The ICO's online tracking guidance took effect on 5 October 2023, so anything that tracks a creator audience needs a lawful basis before the campaign starts.
Agree the reporting window before you brief30 days suits a launch push, 90 days suits considered purchases.
Separate reach metrics from outcome metrics, then report both against a stated objective.
File disclosure evidence alongside performance data, following the ASA and CAP advice for businesses on complying with advertising rules.
Keep every figure in one place so the client sees what you see.

Why the reporting window defines your metrics

The same campaign looks successful or weak depending on when you stop counting. A 30-day window flatters fast-moving products. A 90-day window captures repeat purchase.

30-day vs 90-day window

30-day window

Best for: fast-moving products
Day 31 sale: does not count
Risk: flatters results

90-day window

Best for: repeat purchase
Day 31 sale: counts
Risk: slower feedback

Write the window into the brief before creators are booked. State the start date, the end date and how late conversions are handled. A sale landing on day 31 of a 30-day window does not count, and your report should say so.

Attribution matters too. Last-click credits the final touch, which often sits with search or email rather than the creator. A holdout group gives you a firmer comparison. Name the method in the report.

The metrics worth reporting

Reach metrics show distribution. Outcome metrics show effect. Report them in separate blocks.

Metrics to report

Reachimpressions, accounts reached, average views
Engagementsaves, shares, comments, profile visits
Responselink clicks, click-through rate, cost per click
Outcomeleads, purchases, revenue, cost per acquisition
Efficiencycost per thousand impressions, cost per engagement

For a small campaign, for example a team paying £400 a month across four creators, cost per acquisition is the first number a finance lead asks about. Reach alone will not answer it.

Saves and shares often predict downstream action better than likes, so treat them as leading indicators rather than proof of sales. Our guide to a micro influencer marketing reporting dashboard shows how to lay out both blocks side by side.

Setting a benchmark before you start

Pull your own historical data first. If earlier campaigns produced a cost per acquisition of £18, that becomes the line a new campaign must beat. For example, a team aiming for 120 tracked leads from a £2,400 campaign is working to £20 a lead.

Handling incomplete data

Some platforms withhold granular data or report it late. Note the gap rather than filling it with an estimate presented as fact. If you must estimate, show the assumption behind it.

Attribution, tracking and UK data protection

Tracking a creator audience usually involves personal data. The ICO's guidance on online tracking explains the consent and transparency expectations that apply.

That shapes how you build tracking links, pixels and landing pages. Check the lawful basis before launch. Retrofitting consent after a campaign has run leaves you with data you may not be able to use.

Where leads are the goal, LinkedIn's lead generation ads are one route for capturing and reporting creator-driven conversions, though the same reporting discipline applies.

A measurement checklist

Objective written in one sentence, with a number attached.
Reporting window agreed and dated.
Attribution method named in the brief.
Tracking links and pixels tested before launch.
Lawful basis for audience tracking recorded.
Disclosure evidence filed with performance data.
Reach and outcome metrics reported separately.
Benchmark from a previous campaign shown for comparison.
Gaps and estimates labelled as such.

The wider process, including the order these tasks should follow, is set out in our guide to micro influencer marketing measurement and reporting.

Common questions

How long should a micro influencer campaign reporting window be?

Thirty days suits impulse purchases and launch pushes. Ninety days suits considered purchases and repeat orders. Pick one and state it in the brief.

Which single metric matters most?

Cost per acquisition, if the campaign has a commercial goal. It links spend to an outcome a finance lead recognises. Reach and engagement are context, not proof of payback.

Do I need consent to track influencer campaign clicks?

Often yes. The ICO guidance sets out consent and transparency expectations for tracking technologies, so check the lawful basis for your setup before launch.

How do I report results when platform data is incomplete?

Say what is missing, why, and what it means for confidence in the numbers. Label any estimate and never present a modelled figure as measured.