You paid a creator £200 for a post. Your sales went up that week. But did the creator cause those sales, or would they have happened anyway? And even if they did, was £200 a good price for what you got?
Most small brands can't answer these questions because they don't track the right numbers. They look at likes and comments, maybe follower growth, and call it a day. But engagement isn't ROI. ROI is money in versus money out.
Here's how to actually calculate it.
The formula
Influencer ROI = (Revenue from influencer - Cost of influencer) / Cost of influencer × 100
That's it. If you spent £200 and the creator drove £600 in sales, your ROI is (600 - 200) / 200 × 100 = 200%. You made £2 for every £1 you spent.
The hard part isn't the maths. It's knowing the revenue number. How much revenue did this specific creator actually drive?
Getting the revenue number right
There are three ways to attribute revenue to a creator, ranked from worst to best:
Discount codes (unreliable). Give the creator a unique code — SARAH10, JAKE20 — and count redemptions. The problem is code leakage. Within days, those codes end up on coupon aggregator sites. People who never saw the creator's content find the code via Google and use it at checkout. You end up attributing sales to Sarah that had nothing to do with her.
Discount code ROI is almost always inflated. Some brands report 300% ROI from codes, when the real number is closer to 80% once you account for coupon site traffic.
Post-purchase surveys (directional). Ask customers "how did you hear about us?" after they buy. This gives you a rough signal but it's wildly inconsistent. People forget. They say "Instagram" when they actually found you through a friend who saw an Instagram post. It's useful as a directional check, not as a measurement tool.
Tracked attribution links (accurate). Give each creator a unique tracked link. When someone clicks that link and buys, the sale is attributed to that creator. No codes to leak, no surveys to misremember. The attribution happens at the click level, server-side.
With LinkOwl, you create a link per creator, connect your payment system, and the dashboard shows exactly how much revenue each creator drove. That's your numerator for the ROI formula.
A worked example
Say you work with three creators for your small clothing brand:
Creator A — Micro-influencer (8K followers)
- Cost: £50 (gifted product only)
- Tracked link clicks: 120
- Sales attributed: 6
- Revenue: £240
- ROI: (240 - 50) / 50 × 100 = 380%
Creator B — Mid-tier (45K followers)
- Cost: £300 (flat fee)
- Tracked link clicks: 890
- Sales attributed: 11
- Revenue: £440
- ROI: (440 - 300) / 300 × 100 = 47%
Creator C — Micro-influencer (12K followers)
- Cost: £75 (gifted product + small fee)
- Tracked link clicks: 200
- Sales attributed: 8
- Revenue: £320
- ROI: (320 - 75) / 75 × 100 = 327%
Creator A had the best ROI by far. Creator B drove the most total revenue but at a much lower return rate. Creator C was strong across the board.
Without this data, you might have assumed Creator B was your best performer because they have the biggest audience. The numbers tell a different story.
What ROI should you aim for
There's no universal benchmark because it depends on your margins. A brand with 70% margins can afford a lower ROI than one running at 30%.
Some rough guidelines:
- Below 0%: You lost money. Not necessarily a failure if this was a test, but don't repeat it without changes.
- 0-100%: You're breaking even or making modest returns. Fine for awareness campaigns but not sustainable as your only strategy.
- 100-300%: Strong performance. Worth repeating and potentially scaling.
- 300%+: Exceptional. Double down on this creator.
For small brands, anything above 100% ROI is a win. You're making more than you spent, and you have data to refine your approach.
The numbers most brands forget to include
When calculating cost, include everything:
- Creator fee (flat rate, commission, or product gifting value)
- Product cost (if you sent free product, count your cost of goods)
- Shipping (sending product to the creator)
- Content production (if you paid for photography, editing, etc.)
- Your time (if you spent 3 hours managing the relationship, that has a cost)
Most brands only count the creator fee and forget product cost and shipping. This makes their ROI look better than it actually is.
On the revenue side, decide whether you're counting gross revenue or profit. Gross revenue gives you a higher ROI number but doesn't account for your product costs. If you want a true picture, use profit (revenue minus cost of goods).
Why per-creator tracking matters more than aggregate
Some brands track influencer marketing in aggregate: "We spent £2,000 on influencers this month and revenue was £8,000." That gives you an overall ROI of 300%, which sounds brilliant.
But within that £2,000, you might have one creator who drove £6,000 and another who drove £200. The aggregate number hides the fact that most of your budget was wasted. What you actually want is ROI per creator, so you can cut the underperformers and reinvest in the ones who convert.
This is only possible with per-creator attribution. One tracked link per creator, one clear revenue number per creator.
Improving ROI over time
Once you have data from a few campaigns, patterns emerge:
Content format matters. Try-on hauls might convert better than flat-lay photos. Stories with direct CTAs might outperform feed posts. Track which formats drive the most clicks and sales per creator.
Timing matters. A post that goes live on payday Friday might convert differently than one on a Tuesday morning. If you have enough data points, you'll start to see patterns.
Audience fit matters more than size. A creator with 5,000 highly engaged followers in your exact niche will almost always outperform a creator with 100,000 general followers. The data usually confirms this within the first few campaigns.
Repeated partnerships compound. A creator's audience needs to see your product 2-3 times before they buy. First-time partnerships often have lower ROI than repeat ones. Don't judge a creator on a single post if you can afford to test them twice.
Getting started
The minimum you need: one tracked link per creator, connected to your payment system. LinkOwl does this at 5p per attributed sale — no monthly fee. Create links, share them with creators, and your dashboard shows revenue per creator automatically.
From there, the ROI calculation takes 30 seconds. Revenue minus cost, divided by cost. No spreadsheet gymnastics, no guesswork. Just numbers you can act on.