est_trend_3m, on products, shops and trending results.
est_trend_3m compares estimated sales in the last three completed calendar months (UTC) with the three months before them:
0.12 means 12% more sales than the three months before, -0.3 means 30% fewer. In October 2026 it compares July to September with April to June.
The monthly sales come from the monthly history described in Sales estimates: each month’s reviews divided by the shop’s review rate.
est_trend_3m is null when:
- any of the six months is missing from the history, or
- the earlier three months add up to 0, so there is nothing to compare with.
0 for an unknown trend: 0 means sales were flat.
Limits
- The latest month fills in as late reviews arrive (see Sales estimates), which can pull the trend down for a few weeks after a month ends.
- Small numbers swing: a product going from 3 to 6 sales shows
1(+100%). Trending’srisinglist ranks only items with at least 30 estimated sales a month on average for this reason.