Originally sent to the AmpliSell newsletter on February 26, 2026. Join the list here.
I had a dozen calls this month with ecomm operators and every single one who had launched on TikTok saw an uplift in Amazon sales.
A director of ecommerce at a $50M CPG brand told me: "If something's on TikTok, we end up getting like 60% of that as halo sales on Amazon. It is a direct feed to Amazon."
A founder said: "Every time we turn TikTok off, we see sales decrease on Amazon. It's happened so many times that the data doesn't lie at this point."
And a third was shared: "I have no idea if [our halo] data is accurate. It's cool if it's true, but I don't know if I 100% believe it."
Three different brands. Three different revenue levels. Three different categories.
But they all saw the same thing:
TikTok videos lead to an increase in Amazon sales.
And they all had the same problem:
They couldn't measure it.
The Problem
When you can't measure the halo effect, you can't justify the investment in TikTok. And when you can't justify it, one of two things happens. Either leadership pulls the plug on TikTok because "the CAC is too high" or you keep spending with no confidence that you're investing in the right channel.
Both outcomes leave money on the table.
We've seen brands where TikTok Shop generates $30K in direct GMV per month, but the actual revenue impact across Amazon and DTC is closer to $90K when you account for halo. Measuring only direct TikTok Shop sales means you're seeing 30% of the picture.
Our 4-step Framework
How we measure the halo effect at AmpliSell
Step 1: Capture your Amazon baseline
Pull 90 days of Amazon data for the ASINs you plan to promote on TikTok.
Break it down by these metrics:
And the following for your brand name:
Put it in a spreadsheet. This is your "before" picture.
Step 2: Pick a control ASIN.
Choose one product you're NOT promoting on TikTok, ideally something at a similar price point with comparable sales.
Track the exact same metrics for this ASIN.
If Amazon is naturally trending up due to seasonality or market forces, your control ASIN will show it.
But if your TikTok promoted ASINs spike and your control stays flat, the only variable that changed is TikTok.
Step 3: Build your daily correlation tracker.
Once TikTok goes live, create a simple spreadsheet that logs these numbers every single day:
Or just sign up for Cruva and get it all in a nice dashboard.
When TikTok videos and views climb, does Amazon revenue for those specific ASINs follow?
Does branded search volume trend upward?
Does your control ASIN stay roughly flat during the same window?
After 30 days you will see the pattern.
After 60 days you will have conviction.
After 90 days you will be pouring into TikTok.
Step 4: Calculate your incremental Marketing Efficiency Ratio (MER).
Incremental MER = (Current Total Revenue − Baseline Revenue) ÷ (Current Total Marketing Spend − Baseline Marketing Spend)
Use total revenue across all channels, not just TikTok Shop GMV. The whole point is capturing the halo.
Say before TikTok you were doing $200K/mo on $50K/mo in spend. Two months after launch, you're at $260K/mo on $68K/mo.
Incremental MER = $60K ÷ $18K = 3.3x
Every incremental dollar into TikTok generated $3.30 across your entire business.
It's not a perfect measurement, but it's directional enough to make the case for your investment!
We build this attribution framework into every client engagement from day 1. If you need our help, let's talk.
→ Book a Call: https://calendar.app.google/zjKYWXc3YvjRZt3q9
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