Once you know how to make a few basic crochet stitches, increases and decreases are what allow those stitches to become something more interesting than a rectangle.
An increase makes your fabric wider by adding stitches. A decrease makes it narrower by combining stitches. Those two simple ideas are responsible for much of the shaping you see in hats, sleeves, sweaters, shawls, amigurumi, baskets, bags, circles, triangles, and countless other crochet projects.
The techniques themselves are not difficult. The challenge for beginners is usually understanding where to place them, how they affect the stitch count, and how to recognize when the shaping is working correctly.
Once you understand those principles, increases and decreases stop feeling like special techniques and become ordinary tools you can use to make crochet curve, taper, flare, and fit.
🧶 What Is a Crochet Increase?
A crochet increase simply means creating more stitches than you had in the previous row or round.
The most common way to increase is to work two stitches into the same stitch.
If you have one stitch from the previous row and make two single crochets into it, you have turned one stitch into two. Your stitch count has increased by one.
A pattern might write this as 2 sc in next st, sc inc, or simply inc, depending on the designer.
The idea remains the same: more than one new stitch is placed into one existing stitch.
🪡 What Is a Crochet Decrease?
A decrease does the opposite.
Instead of making separate complete stitches into several stitch locations, you partially work two or more stitches and finish them together as one.
For example, sc2tog means single crochet two stitches together.
Two stitches from the previous row become one finished stitch in the new row, reducing the stitch count by one.
You may also see dec or decrease written instead of a specific abbreviation.
Always check the pattern’s abbreviation key because designers sometimes use slightly different notation.
🌱 How to Make a Single Crochet Increase
A single crochet increase is one of the easiest shaping techniques to learn.
Work one single crochet into the designated stitch as usual. Instead of moving to the next stitch, insert your hook back into the same stitch and make a second single crochet.
You have now worked two single crochets into one stitch.
If your row originally contained 10 stitches and you make one increase without any other shaping, the new row will contain 11.
This simple technique is used constantly in amigurumi, hats, circles, bags, and shaped garments.
➖ How to Make a Single Crochet Decrease
A standard single crochet decrease is usually written sc2tog.
Insert your hook into the next stitch, yarn over, and pull up a loop. You now have two loops on the hook.
Do not finish the single crochet.
Insert the hook into the following stitch, yarn over, and pull up another loop. You should now have three loops on your hook.
Yarn over and pull through all three loops.
Two stitch locations have become one completed single crochet.
If the previous row had 10 stitches and you work one sc2tog without any other shaping, the new row will contain nine.
🧸 What Is an Invisible Decrease?
If you crochet amigurumi, you will probably encounter the invisible decrease.
A standard single crochet decrease can leave a small bump or visible gap. The invisible decrease creates a smoother surface by working primarily through the front loops of the next two stitches.
Insert the hook through the front loop of the first stitch and then through the front loop of the following stitch. Yarn over and pull through both front loops, then yarn over again and complete the stitch.
This creates a less noticeable decrease on the outside of the fabric.
Invisible decreases are especially useful for stuffed animals and other projects where a smooth, tight surface matters.
They are not necessarily the correct decrease for every project, however. Follow the pattern if it specifies another method.
🧶 Half Double Crochet Increases
To increase in half double crochet, make two half double crochet stitches into the same stitch.
Yarn over, insert the hook into the designated stitch, pull up a loop, yarn over, and pull through all three loops.
Then repeat the entire half double crochet in that same stitch.
One existing stitch has now produced two new stitches.
The technique is exactly the same concept as a single crochet increase, even though the stitch itself is taller.
➖ Half Double Crochet Decreases
A half double crochet decrease may be written hdc2tog.
Yarn over and insert the hook into the next stitch. Yarn over and pull up a loop.
Instead of completing the stitch, yarn over again and insert the hook into the following stitch. Pull up another loop.
You will have several loops on the hook.
Yarn over and pull through all the remaining loops to finish the two stitches together as one.
The exact number of loops can look intimidating the first time, but the principle is simple: begin one stitch, begin the next, then finish them together.
🌿 Double Crochet Increases
A double crochet increase is typically made by working two double crochets into one stitch.
Make the first double crochet normally.
Then insert your hook back into the same stitch and make a second double crochet.
The resulting fabric spreads outward slightly because two new stitches now occupy the space previously held by one.
Double crochet increases are common in shawls, circular motifs, sleeves, skirts, hats, blankets, and many lace patterns.
➖ Double Crochet Decreases
A double crochet decrease is often written dc2tog.
Yarn over and insert the hook into the first stitch. Yarn over and pull up a loop, then yarn over and pull through two loops.
Stop before completing the stitch.
Yarn over and insert the hook into the next stitch. Pull up a loop, yarn over, and pull through two loops.
You now have the unfinished top of both double crochets waiting on the hook.
Yarn over and pull through all remaining loops.
Two double crochets have been joined into one.
🧭 Where You Place an Increase Matters
Increasing at the beginning of a row produces a different shape from increasing in the middle.
If you add stitches only at one edge, the fabric begins slanting outward on that side.
If you increase at both edges, the entire piece gradually becomes wider.
If increases are placed repeatedly in the same central location, the fabric can form a point or wedge.
In a circle, increases distributed evenly around each round allow the piece to expand while remaining relatively flat.
This is why patterns do not simply say “increase six times” without telling you where. Placement determines shape.
📉 Decrease Placement Changes Shape Too
The same principle applies to decreases.
A decrease at one edge creates a slope. Decreases on both edges taper the entire piece.
Centered decreases can create darts, points, neck shaping, or decorative lines.
In amigurumi, decreases distributed evenly around a round gradually close a sphere or cylinder.
Once you begin looking at crochet this way, shaping becomes much easier to understand. The pattern is essentially telling the fabric where it should expand and where it should contract.
📏 Always Watch Your Stitch Count
Increases and decreases deliberately change your stitch count, which makes counting especially important.
Suppose you begin with 20 stitches and the next row tells you to increase once at each edge.
You should finish with 22 stitches.
If the next row decreases once at each edge, you should return to 20.
Patterns often include the expected stitch count in parentheses at the end of a row or round.
Use it.
If the pattern says (36 sts) and you count 35, something went wrong. Finding the error immediately is much easier than discovering it five rows later.
🔢 Understand What an Increase Adds
One standard increase generally adds one stitch.
If you work two single crochets into one stitch, you are not adding two stitches to the total. One stitch already existed in that location. You are replacing it with two, so the net change is plus one.
This distinction becomes important when calculating stitch counts.
Three standard increases add three stitches.
Six increases add six.
If a designer tells you to place three double crochets into one stitch, however, that creates a larger increase because one old stitch has produced three new ones.
Read the exact instruction rather than assuming every increase has the same effect.
🔢 Understand What a Decrease Removes
A standard two-stitch decrease usually reduces the stitch count by one.
Two old stitches become one new stitch.
If you work five sc2tog decreases in a round, the total stitch count decreases by five.
Some patterns combine three stitches instead, such as dc3tog. In that case, three previous stitches become one new stitch, reducing the stitch count by two.
Again, the numbers in the abbreviation tell you what is being combined.
🌀 How Increases Create a Flat Crochet Circle
Flat circles are one of the best ways to see increases in action.
Imagine starting with six single crochets in a magic ring.
If you place two single crochets into every stitch on the next round, the stitch count doubles from six to twelve.
On the following round, you might alternate one regular single crochet with one increase. The next round might place two regular stitches between each increase.
As the circle becomes larger, increases are spaced progressively farther apart.
This controlled expansion allows the circumference to grow along with the diameter.
Too few increases and the circle begins cupping upward.
Too many and the edge begins rippling.
The fabric itself gives you visual clues about whether the shaping is balanced.
🎩 How Decreases Shape the Top of a Hat
Imagine crocheting a simple hat from the bottom upward.
The body of the hat may maintain the same stitch count for many rounds, creating a tube.
Once you reach the crown, evenly spaced decreases begin reducing the circumference.
The opening becomes progressively smaller until only a few stitches remain.
Those decreases transform a tube into a rounded hat.
The same idea appears in many other projects. Decreases turn straight sections into tapered shapes.
🧸 How Increases and Decreases Make Amigurumi Shapes
Amigurumi depends heavily on shaping.
A ball typically begins with a small ring followed by several rounds of increases. Once the widest point is reached, the pattern works even for a while with no increases or decreases.
Then decreases gradually close the shape.
Changing the placement and frequency of increases and decreases can turn that same basic idea into a head, body, paw, snout, fruit, animal, or nearly any three-dimensional form.
If you understand the mathematics of a basic crochet sphere, many amigurumi patterns become much easier to visualize.
🧣 Shaping Crochet in Rows
Projects worked flat can also be shaped easily.
Suppose you begin with a narrow row and increase at both ends of every other row. The fabric gradually widens into a trapezoid.
Continue long enough and it may become a triangular shawl or flared garment section.
Reverse the process and decrease at the edges to narrow the fabric again.
Sleeves, necklines, armholes, skirts, cardigans, and shaped accessories all use variations of this technique.
🧶 Increasing at the Beginning of a Row
There are several ways to increase at the edge of a row depending on the stitch and pattern.
The simplest approach is often to work two stitches into the first stitch.
If your turning chain counts as a stitch, however, the instructions may handle that edge differently.
Some patterns use extra chains to create additional stitches at the beginning of a row.
Do not automatically apply one method to every project. Edge shaping interacts with turning chains and stitch height, so follow the pattern’s instructions closely.
🧵 Increasing at the End of a Row
Increasing at the end may be as simple as working two stitches into the final stitch.
Again, watch whether the turning chain from the previous row counts as a stitch.
Missing the true final stitch is extremely common, especially in taller stitches such as double crochet.
Placing a stitch marker in the first and last stitch can make edge shaping much easier while you are learning.
📐 Smooth Shaping vs. Stepped Shaping
Frequent small increases or decreases create a gradual slope.
Larger changes made less often create more obvious steps.
In a garment neckline, for example, the designer may combine decreases with slip stitches or fastened-off sections to produce a particular curve.
After blocking and seaming, those small steps often become much less noticeable.
Do not assume a shaped crochet edge should look perfectly smooth while it is still on the hook.
The finishing process is part of the construction.
🧶 How to Space Increases Evenly
Patterns sometimes tell you to increase evenly across a row or round.
Suppose you have 40 stitches and need to add five stitches.
You need approximately one increase for every eight existing stitches.
A designer may provide the exact spacing, but if you are adapting your own project, simple division can help distribute the increases.
Perfect mathematical spacing is not always possible, particularly when the numbers do not divide evenly. In that case, spread the increases as symmetrically as possible rather than clustering them in one area.
Even distribution helps prevent noticeable bulges.
➖ How to Space Decreases Evenly
The same principle applies to decreases.
If a round contains 48 stitches and you need six decreases, spacing them approximately every eight stitches distributes the shaping around the piece.
In actual pattern notation, this might become something like several regular stitches followed by a decrease, repeated around.
As rounds become smaller, the number of ordinary stitches between decreases usually decreases too.
That is how circular and three-dimensional pieces close smoothly.
🌀 Why Is My Circle Ruffling?
If a flat crochet circle begins developing wavy edges, you may be adding stitches too quickly.
The outer edge has more fabric than it needs to lie flat, so it begins forming ripples.
Check whether you accidentally added extra increases.
Your hook size and personal tension can also affect the result, so the mathematically standard formula may need slight adjustment for a particular yarn or stitch.
A small amount of waviness may disappear with blocking, but pronounced ruffling usually means the increase rate is too high.
🥣 Why Is My Circle Turning Into a Bowl?
If your intended flat circle begins curling upward into a bowl, it may not contain enough increases.
The circumference cannot expand fast enough to remain flat.
This is not always a problem. In fact, deliberately reducing the increase rate is exactly how many hats, baskets, bowls, and amigurumi shapes are created.
The difference between a flat circle and a three-dimensional object is often simply the rate at which stitches are added.
Crochet shaping is geometry made from yarn.
🧩 Why Are My Decreases Leaving Holes?
Standard decreases can sometimes create visible gaps, particularly in tightly stuffed amigurumi.
Loose tension can make those gaps more noticeable.
An invisible decrease can help when working single crochet in the round. Using an appropriate hook size and keeping the fabric comfortably firm also reduces openings.
For garments and looser fabrics, a tiny gap may not matter at all and can disappear after blocking.
The correct decrease depends on the project, so do not automatically replace every standard decrease with an invisible one.
🪡 Why Is My Shaping Uneven?
If one side of a project slopes differently from the other, check your stitch counts and placement.
You may be missing an increase at one edge, placing a decrease into the wrong stitch, or accidentally treating a turning chain inconsistently.
Marking the shaping points can help.
If the pattern tells you to increase at both ends of every fourth row, place removable markers where those increases occur. The visual reminder makes it easier to see whether both sides are progressing symmetrically.
📖 Read the Entire Shaping Instruction First
Garment patterns often combine several instructions in the same section.
You might be told to continue a stitch pattern while decreasing at both edges every second row.
That means two things are happening simultaneously.
The stitch pattern continues in the middle while the stitch count changes at the edges.
Read the whole section before beginning so you know what must be maintained and what must change.
Mark completed shaping rows if necessary.
This is one of those situations where writing notes directly on a working copy of the pattern can save a great deal of frustration.
🧵 What Does “Decrease in Pattern” Mean?
Sometimes a decrease falls inside a textured or lace stitch pattern.
Instead of simply making a standard decrease, the designer may need you to adjust the surrounding stitch sequence so the pattern remains visually consistent.
This is common in garment shaping.
The instruction may say something like “maintain pattern as established while decreasing at each edge.”
When this happens, the pattern repeat becomes as important as the stitch count.
Look at the rows below and determine which elements of the design need to continue even as the available space becomes narrower.
This is more advanced shaping, but the underlying idea is still the same: remove stitches while preserving the visual pattern as much as possible.
📏 Gauge Matters When Shaping Garments
If you are making a fitted project, increases and decreases assume your gauge is reasonably close to the designer’s.
Suppose a sleeve is shaped by increasing every sixth row.
If your rows are much taller than the pattern’s gauge, those increases will be spaced farther apart in actual inches. The sleeve may become longer before reaching the intended width.
If your stitch gauge is too loose, the piece may become wider than expected even when you follow the stitch counts perfectly.
That is why gauge is especially important for sweaters, cardigans, fitted hats, and other shaped garments.
Correct shaping depends on both stitch count and physical measurements.
🧶 Don’t Confuse Increases With Stitch Multiples
Some stitch patterns naturally place several stitches into one location.
A shell containing five double crochets may look like an enormous increase, but later instructions may skip several stitches to compensate.
The overall stitch count may therefore remain unchanged.
Always look at the complete repeat rather than judging one part in isolation.
Crochet lace frequently expands in one location and contracts somewhere else within the same row.
The pattern’s final stitch count tells you whether the row truly increased.
✂️ Frogging a Shaping Mistake
If you discover an increase or decrease in the wrong place, the cleanest solution is often to unravel back to the mistake and redo it.
Crocheters call unraveling frogging, supposedly because you “rip it, rip it.”
It may be tempting to hide an extra stitch by skipping one somewhere later in the row.
Sometimes that works in a simple project, but in shaped pieces it can move the shaping line and create a visible distortion.
If the pattern depends on symmetry or fit, correcting the actual mistake is usually worth the extra few minutes.
🧠 Learn to Read the Shape as You Crochet
Patterns provide instructions, but your fabric provides information too.
If a supposed flat circle is becoming a bowl, something about the increase rate is changing the shape.
If a sleeve is meant to taper but stays the same width, perhaps a decrease was missed.
If one edge slopes and the other remains straight, check whether both shaping instructions have been worked.
The more you crochet, the more quickly you will notice when the fabric does not match the shape you expected.
That visual awareness is one of the biggest steps from simply following patterns to actually understanding crochet construction.
🧣 Practice With a Simple Shaping Swatch
You can practice increases and decreases without committing to a full project.
Begin with a chain and work several rows of single crochet.
Then work an increase at both ends of the next few rows. Watch the rectangle gradually widen.
After several rows, begin working one decrease at both ends instead.
The fabric will narrow again.
This simple swatch lets you see shaping clearly because there is no complicated stitch pattern distracting you.
Try the same experiment in half double crochet or double crochet and notice how the taller stitches change the slope.
🔺 Make a Simple Triangle
A triangle is another excellent practice project.
Begin with a small number of stitches and increase at both edges on every row or every other row, depending on the angle you want.
The piece gradually expands outward into a triangular shape.
This same concept appears in shawls, bandanas, bunting, and decorative motifs.
Once you understand how repeated increases create the triangle, patterns using the technique become much easier to visualize.
🧺 Use Shaping to Create a Basket
A simple crochet basket demonstrates both flat and three-dimensional shaping.
Begin by crocheting a flat circle with regularly spaced increases.
Once the base reaches the desired size, stop increasing.
Continue working the same number of stitches around.
The fabric can no longer expand outward, so it begins growing upward and forming the walls of the basket.
No complicated architectural trick is involved.
The shape changes because the increases stop.
🧢 Use Shaping to Make a Hat
Many top-down hats follow a similar process.
Begin with a small ring.
Increase evenly for several rounds until the crown reaches the correct diameter.
Then stop increasing and continue with the same stitch count.
The fabric bends downward and forms the sides of the hat.
Bottom-up hats reverse the logic, maintaining the same circumference through the body before using decreases to close the crown.
Understanding shaping lets you see why the construction works instead of simply trusting mysterious pattern numbers.
🌟 Shaping Is What Makes Crochet Come Alive
A basic stitch gives you fabric.
Increases and decreases give that fabric shape.
Two stitches worked into one can make a circle expand, a shawl widen, a skirt flare, or an amigurumi head become round.
Two stitches worked together can narrow a sleeve, close a hat, sculpt a toy, or form the curve of a neckline.
The techniques are small, but their effect is enormous.
Begin with the simplest versions: two stitches in one for an increase and two stitches together for a decrease. Watch your stitch counts, pay attention to placement, and notice how each change affects the shape growing beneath your hands.
Soon, increases and decreases stop feeling like special instructions buried in a pattern.
They become exactly what they are: the tools that let you tell your crochet where to go.
🔗 Related Articles
- Crochet Abbreviations Guide: Common Stitch Terms & What They Mean
- How to Read Crochet Patterns: A Beginner’s Guide to Abbreviations, Repeats & Symbols
- Mastering the Single Crochet: A Beginner’s Guide
- Mastering the Treble Crochet: A Beginner’s Guide
- The Art of the Bobble Stitch: A Guide to Creating Eye-Catching Crochet Designs
