How to read it
The percentage tells you whether sales went up or down compared to the previous period:
Positive %: The product sold more in the most recent 7 days than it did in the prior 7 days.
Negative %: The product sold less in the most recent 7 days than it did in the prior 7 days.
0%: Sales were roughly the same across both periods.
What it's comparing
This metric compares two 7-day windows back to back:
Period A: Last 7 days
Period B: The 7 days before that
The percentage shows the change from Period B to Period A.
What this does not mean
It doesn't show these things:
It does not predict future sales.
It does not guarantee the product will keep selling.
It does not show who caused the sales.
A big percentage increase doesn't always mean big sales. Sometimes it just means the product sold very little before, and then a bit more recently.
That's why you should always look at the actual number of units sold, not just the percentage.
How to use it
Two ways to use it well:
Use this metric to spot products that are selling more right now.
Pair it with total units sold and stock to avoid reacting to a small base.