How do I fix a knitting mistake several rows down?

Dropping one column down to the error and reworking it with a crochet hook, when to unpick stitch by stitch instead, and when ripping back is genuinely the faster answer.

Difficulty: intermediate
Time: 30 min
Read: 4 min

Short answer

For a single wrong stitch — a purl where a knit should be, or a twisted stitch — drop that one column deliberately down to the mistake, then use a crochet hook to work each rung back up correctly. For anything involving a change in stitch count, unpick row by row instead, because a dropped column cannot restore a missing stitch.

There are three ways back to an error, and choosing wrongly costs an evening. Laddering one column down is surgical and quick but only works when the stitch count is right. Unpicking stitch by stitch, sometimes called tinking, is slow but safe. Ripping back to a lifeline is fastest for anything more than a few rows.

What you'll need

A crochet hook a size smaller than your needles
A stitch marker or safety pin
Spare smooth yarn for a lifeline (optional)

Step by step

Work out what kind of mistake it is.A stitch worked the wrong way, twisted, or in the wrong colour leaves the stitch count intact and can be laddered down. A missed increase, an extra stitch, a dropped stitch or a cable crossed the wrong way changes the structure and cannot.
For a wrong stitch, mark the column.Put a safety pin in the offending stitch on the row below your needle so you can find it once the fabric moves.
Knit to the column, then drop it deliberately.Work along the current row until the marked column is the next stitch, then slip it off the needle and let it run down. It will ladder cleanly to the mistake, leaving horizontal rungs between the two sound columns.
Stop the run one row below the error.Put the crochet hook through the loop as soon as it reaches the row you need. Letting it run further just means more rungs to rework.
Work the rungs back up with the hook.For a knit stitch on the right side: hook through the loop from front to back, catch the lowest rung, pull it through, and repeat with each rung upwards. For a purl on the right side, work from the back instead — or turn the work round and treat it as a knit.
Put the last loop back on the left needle the right way round.Leading leg at the front on most Western knitting. A stitch remounted backwards knits up twisted and you will be back here tomorrow.
Check the tension of the reworked column.It often sits slightly loose or tight. Work the yarn along the column with a needle tip to even it out; a light blocking removes what is left.
For a stitch-count error, unpick row by row instead.Put the work back onto the needle one stitch at a time, working backwards: slip the left needle into the stitch below, drop the stitch off the right needle, pull the yarn free. Slow, but nothing is lost.
For more than five or six rows, rip back.Pull the needle out, unravel to one row above the error, then pick the stitches back up onto a needle several sizes smaller before working them onto the right size. Picking up on a smaller needle stops stitches escaping.
Put a lifeline in before attempting anything complicated.Thread smooth waste yarn through every live stitch on a good row using a tapestry needle. If the repair fails, you can rip straight back to it without losing your place. Essential in lace.

Tips

Fix it now. A mistake ten rows down is a fifteen-minute job; fifty rows down it is an evening.
Take a photo of the work before you start dropping stitches. It helps enormously when re-establishing a pattern.
In garter stitch, remember alternate rungs go the other way — turn the work over each time rather than trying to reason it out.

Common mistakes

Laddering down to fix a missing or extra stitch — Dropping a column can only rework the stitches that are there. It cannot conjure a stitch you never made, so the count stays wrong and the fabric distorts around it.
Ripping back without a lifeline in lace — Lace has yarn-overs and decreases that are almost impossible to identify once the stitches are loose. A lifeline turns a lost project into a five-minute setback.

If it doesn't work

Reworked column is looser than the rest

Cause: Yarn redistributed unevenly while hooking up — Fix: Ease the slack along the column with a needle tip over several stitches, then block.

Stitches escaped while ripping back

Cause: Picked up on a needle the same size, or unravelled too far — Fix: Pick up on a much smaller needle or a spare circular, then transfer. Any stitch mounted backwards can be corrected as you work the next row.

The repaired stitch is twisted

Cause: Loop replaced on the needle the wrong way round — Fix: Slip it off, turn it, and replace it with the leading leg at the front.

Cannot tell which row the error is on

Cause: Pattern lost — Fix: Count rows from a landmark such as a cast-on edge or a colour change, marking every tenth row with a pin.

Questions people ask

Is it worth fixing, or should I just leave it?

On a plain area of a garment, a single wrong stitch that you can only see because you know it is there is usually not worth an evening. On a rib, a cable or anywhere it interrupts a repeating pattern, it will catch your eye forever, so fix it.

What is a lifeline?

A length of smooth waste yarn threaded through all the live stitches on a known-good row. It costs two minutes and means the worst outcome of any later disaster is ripping back to that row rather than starting again.