Influencer campaign CPM calculator

Start with a completed campaign or a clearly labelled forecast. For a completed campaign, use the fee and the actual impressions for the agreed deliverables. Record the reporting date: a result collected seven days after publication will differ from one collected after a month.

Decide what the cost includes before comparing campaigns. A creator fee alone gives a different result from a total that includes production expenses, agency fees and paid promotion. Both can be useful when labelled. Use the same cost basis for each comparison.

If you include paid promotion spend, the delivery figures must cover the same paid and organic activity without counting the same result twice. If the exports cannot separate or reconcile them, report the two activities separately.

This calculator uses pounds sterling. Convert both campaign costs to the same currency before comparing them, and keep your conversion date and rate in the report.

This is an illustrative calculation, not a suggested rate. A campaign costs £600 and records 40,000 impressions in its agreed reporting window. £600 ÷ 40,000 × 1,000 gives a CPM of £15.

A second campaign costs £900 and records 75,000 impressions. Its CPM is £12. The second has a lower cost per thousand impressions, but that alone does not establish which campaign met the brief. Audience relevance, creative work, usage rights and the intended outcome may differ.

If the first result was 40,000 video views instead, the arithmetic would still give £15, but the label would be cost per 1,000 video views. It would not be an impression-based CPM. Keep the platform’s metric name beside the number when you share it.

For a forecast, write the assumption explicitly: “At an assumed 40,000 impressions, a £600 fee would equal £15 CPM.” Replace the estimate with the measured result after the agreed reporting window.

Impressions count displays under the platform’s reporting definition. Video views follow a platform’s view rules. Reach counts unique people or accounts within the platform’s stated scope. Repeated exposure can raise impressions or views without adding another person to reach.

Do not turn reach into impressions with an assumed multiplier. If you have reach only, record the reach result separately. Likewise, do not add the reach of several posts and label the sum unique campaign reach: the same account may have seen more than one post.

For several posts measured in the same way, divide the total relevant cost by the total relevant impressions. Do not take a simple average of the individual CPMs. That would give a small post as much weight as a large one.

Google’s CPM definition describes cost per thousand impressions in advertising. The calculation here applies that arithmetic to the campaign costs you supply; it does not reproduce an advertising auction or estimate a platform payout.

Keep the fee, included costs, deliverables, metric name, reporting window and data source next to your result. A brand can then see what it is comparing without asking you to reconstruct the calculation.

Use the campaign report template to record that evidence. If your brief is about website visits, agree a tagged campaign link and destination reporting with the brand before publishing.

A low CPM is not evidence of sales, profit or incremental reach. For a sales brief, report the agreed conversion evidence separately and explain the attribution method. For a content production brief, describe the deliverables and approved usage as well as distribution.

For the next campaign, build a quote around its actual scope. Past unit costs can inform the conversation, but they do not replace a fee for your work or a separate agreement about rights.