QoQ (Quarter over Quarter)
Comparing this quarter with the quarter right before it — catches the latest change quickly, but is affected by seasonality.
QoQ change (%) = (This quarter's value − Previous quarter's value) ÷ Previous quarter's value × 100
A positive QoQ means an increase from the previous quarter; a negative one means a decrease.
In plain terms
QoQ means "comparing this quarter with the one right before it." For example, Q3 measured against Q2. It's a way to catch the most recent change quickly.
While YoY compares with a year ago, QoQ compares with just the previous quarter. Changes show up faster, but it takes seasonal effects head-on (it's like comparing summer with autumn).
What it tells you
The strength of QoQ is "speed." When a trend has just started to shift, it can pick up the change in a single quarter instead of waiting a full year as YoY does. It's especially useful for spotting the moment results hit bottom and turn around.
So the roles get divided: QoQ is used to see quickly whether "the direction is changing," and YoY is used to check whether things "really grew compared with a year ago."
Formula
QoQ change (%) = (This quarter's value − Previous quarter's value) ÷ Previous quarter's value × 100
What high or low means
A positive QoQ means an increase from the previous quarter; a negative one means a decrease. However, for seasonal businesses it's normal for QoQ to be negative (or positive) in certain quarters, so the figure alone doesn't divide into good or bad.
That's why QoQ takes on meaning only when you also ask, "did it fall this much in the same quarter in past years too?"
The biggest trap with QoQ is seasonality. For retailers, it's normal for revenue to surge in Q4 (year-end shopping) and then drop sharply in Q1. Without knowing this, seeing only a negative Q1 QoQ can easily lead to the misreading that "the business has broken down."
So for businesses with strong seasonality, YoY is more reliable than QoQ. QoQ works as a supplementary measure for businesses with weak seasonality, or when you want to spot a shift in trend quickly.
Because it covers a single quarter, it swings with one-off events (a big contract, a power outage, a strike). Rather than a single QoQ figure, the picture shows up across several quarters.
Metrics to read alongside
See it in real stocks
Search US stocks on Stocklore to see SEC-filing-based financial metrics alongside the sector benchmark.
This explanation is for information and reference only and is not a recommendation to buy or sell any security. Investment decisions and their consequences are your own.