Stockinette stitch — knit one row, purl the next, repeat — is the most common fabric in knitting, and thankfully it's also the most straightforward to count accurately. The right side shows a field of interlocking V shapes stacked in columns, and each V represents one stitch. Read across a column of V's from the cast-on edge to your needle, and the number of V's you count is the exact number of rows you've knit.
The wrong side looks completely different: horizontal purl bumps instead of clean V's. This asymmetry is actually useful, because it means you always have an obvious way to check which side you're looking at, and by extension whether your row count logic applies. Count from the V side. If you're looking at bumps, flip the work over first.
The actual counting method
Pick a single column of stitches — ideally one near the edge of the work, since edge stitches are usually easier to distinguish from each other than stitches buried in the middle of a busy pattern. Starting from the cast-on edge, count each V shape moving upward toward the needle. Each V is one row. If you cast on and then knit five rows, you should see five V's stacked in that column when you look at the right side.
A trick that helps a lot with accuracy: use a contrasting scrap of yarn or a locking stitch marker looped through the fabric every ten rows as you go. Then, if you ever need to recount, you're only ever counting a maximum of nine rows at a time between markers, rather than squinting at forty or fifty V's in a row and losing your place partway through.
Where the counting gets harder
Stockinette has one well-known enemy: curling. The fabric naturally rolls at the edges, especially before blocking, which can obscure the outermost columns of stitches — exactly the ones you'd normally count from. If your edges are curling, count from a column a few stitches in from the border instead, where the fabric lies flatter.
Color changes and variegated yarn are the other common problem. A busy, high-contrast colorway can visually break up the V shapes so they're harder to distinguish from the surrounding stitches, particularly in low light or with darker colorways where the shadow between stitches doesn't show up as clearly. If you're working with a print yarn like this on a project where the row count actually matters — a fitted garment, a lace panel, anything with shaping tied to a specific row — this is exactly the situation where visual counting starts to fail you, because the very thing that makes the yarn attractive also makes it hard to read.
Rows versus stitches — don't mix them up
One common point of confusion in stockinette specifically: rows and stitches are not interchangeable, even though the fabric can make them look similar at a glance. Rows run horizontally across the piece — how tall it is. Stitches run vertically within a row — how wide it is. When a pattern says 'work 40 rows,' it means 40 passes across the piece, not 40 stitches. When it says 'cast on 40 stitches,' that's the width, established once, before any rows are worked at all.
This distinction matters most during shaping, when you're increasing or decreasing stitch count on specific rows. Losing track of which number you're tracking — rows completed versus stitches on the needle — is one of the most common sources of shaping errors, and it's worth deliberately keeping the two separate in your head, or better, on a counter that tracks both at once so you're not doing the mental math mid-row.
A digital counter removes the ambiguity entirely for both problems. You're not hunting for V's in a busy colorway, and you're not trying to hold two separate numbers in your head while your hands are occupied. Tap for rows, tap for stitches, and the display tells you both instantly, regardless of how the yarn looks.