Increase Calculator

Why the amount per row isn't always the same

Whenever the total stitches to add don't divide evenly across your row count, some rows need one more added than others to land on target — there's no avoiding a little unevenness in the raw numbers, only in how well it's spread across the piece. This calculator distributes the "extra" rows as evenly as possible over the full range, which is the same spacing logic behind a pattern instruction like "increase every 3rd row 4 times, then every 4th row 3 times" — just shown as a direct row-by-row result instead of interval shorthand.

Increasing at more than one point

If you're increasing at both edges in the same row (typical for a symmetric taper, like widening from a cuff toward a sleeve cap), the number shown for that row is the combined total across every increase point — split it evenly (2 sts on a row means 1 at each of 2 edges; for gusset shaping with increases on both sides of a marked stitch, that's often 2 separate increases worked right next to each other).

Picking an increase that matches the look you want

In knitting, a make-one (M1L or M1R) lifts the bar between stitches and is nearly invisible, while a knit-front-and-back (kfb) is faster to work but leaves a small visible bump — for a visible edge like a sleeve seam, kfb's extra bump is easy to hide in the seam allowance, but for an increase that will show in the middle of a piece, M1 in the correct left- or right-leaning direction keeps the fabric looking clean. In crochet, working 2 stitches into the same stitch is the standard increase and reads fine almost anywhere; a yarn-over-based increase deliberately leaves a small eyelet, which is a design choice for lace rather than a shaping technique to reach for by default.

How to Work an Increase

An increase adds one stitch where there was one before. Which increase you choose changes how visible it is and, in knitting, which direction it leans — and on anything with paired shaping, that lean is the difference between a garment that looks deliberate and one that looks approximate. These instructions use US terms.

Crochet increases

The standard crochet increase is simply two stitches worked into the same stitch. There is no special technique to learn; you complete one stitch, then insert your hook into the very same stitch and work another. Patterns write this as "2 sc in next st" or just "inc."

For amigurumi there is a tidier option. The invisible increase works the first stitch into the front loop only of the stitch below, then works the second into both loops of that same stitch. It closes the small gap a standard increase leaves, which matters on dense stuffed pieces where any gap shows the fiberfill through it. On a blanket or a garment, nobody will ever see the difference and the standard increase is fine.

Knitting increases

Increase	How to work it	Character
kfb (knit front and back)	Knit into the stitch as normal but don't slip it off; knit into the back loop of the same stitch, then slip off.	Easiest to learn. Leaves a small horizontal bar — visible, but fine in garter or textured fabric.
M1L (make one left)	Lift the bar between stitches from front to back with the left needle, then knit into the back of it.	Nearly invisible. Leans left.
M1R (make one right)	Lift the bar between stitches from back to front, then knit into the front of it.	Nearly invisible. Leans right.
yo (yarn over)	Bring the yarn over the needle before the next stitch.	Creates a deliberate hole. For lace, not for shaping.

The reason M1L and M1R must be knit through the awkward loop is that it twists the lifted bar. Skip that and you get a hole instead of an increase — which is the most common mistake with these two, and an easy one to spot.

Pairing increases so they mirror

Anywhere you increase on both sides of a piece — a sleeve, a raglan yoke, a triangular shawl — the two sides should lean toward each other or away from each other symmetrically. Use M1R at the start of the row and M1L at the end, and the increases form two mirrored lines running up the fabric.

Using the same increase on both sides is not wrong exactly, but the shaping lines will visibly slant the same direction on both edges, and it reads as a mistake even to people who couldn't name what's off.

Where to place them

Work increases one or two stitches in from the edge rather than in the very first and last stitch. This leaves a clean column of edge stitches for seaming or picking up, and it makes the shaping line itself a decorative feature rather than a lumpy selvedge.

When you need several increases spread across a whole row rather than at the edges, the spacing is its own small calculation — the evenly spaced increase and decrease calculator handles it.

Working out how many and how often

Most shaping is described as a total number of stitches to add over a total number of rows — a sleeve going from 40 to 68 stitches over 60 rows, for instance. That means 28 stitches added, 14 increase rows if you increase at both edges, spread across 60 rows, so roughly every fourth row. The calculator above does this arithmetic and tells you the row interval.

When the interval isn't a whole number, alternate. Every third and fourth row alternately is completely normal, entirely invisible in the finished fabric, and much better than rounding and ending up with the wrong stitch count at the top.

Keeping count

Increases are worked over long stretches with many plain rows between them, which is exactly the condition under which people lose track. Two habits fix it: mark your increase rows with a removable marker as you work them, so you can count backward and see when the last one happened; and count your stitches every ten rows rather than at the end, because finding a missed increase forty rows later is expensive.

Common problems

Problem	Cause and fix
A hole where the increase is	M1 worked without twisting the lifted bar. Knit into the back loop for M1L, front for M1R.
Shaping lines slant the same way on both edges	Same increase used on both sides. Pair M1R with M1L.
Edge is bumpy and hard to seam	Increases worked in the very first and last stitch. Move them one or two stitches in.
Wrong stitch count at the end	A missed or doubled increase row. Recount and adjust across the next few shaping rows.
Amigurumi shows stuffing at increases	Standard increase leaving a gap. Switch to the invisible increase, or go down a hook size.

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