How to Increase and Decrease in Crochet means adding or removing stitches to control the width, circumference, or three-dimensional form of fabric. An increase places multiple stitches into one base stitch, while a decrease joins partial stitches from adjacent bases into one finished stitch. These techniques shape circles, garments, hats, blankets, and amigurumi.
Key Facts and Quick Answer
A single crochet increase usually changes one base stitch into two stitches, adding one stitch to the row count.
A two-stitch decrease changes two base stitches into one finished stitch, removing one stitch.
Flat single crochet circles commonly increase by 6 stitches per round, while double crochet circles commonly increase by 12.
An invisible single crochet decrease uses the front loops of two stitches and usually reduces gaps in stuffed toys.
Shaping evenly across a row creates a smoother curve than grouping every increase or decrease in one location.
Typical beginner practice takes 1-5 minutes for an increase and 10-30 minutes for a clean decrease.
What Do Increases and Decreases Do?
Crochet increases expand fabric because two or more completed stitches occupy one previous stitch. Crochet decreases contract fabric because partial stitches worked into separate bases are completed together. The stitch count changes at the point of shaping, not because the hook or yarn physically expands the existing stitches.
For example, a row with 20 single crochet stitches becomes 21 stitches after one single crochet increase. A row with 20 stitches becomes 19 after one single crochet two together. Repeating that arithmetic across several rounds determines whether the fabric remains flat, curves upward, or forms a sphere.
The same count has different visual effects in different stitch heights. A one-stitch change is subtle in single crochet but creates a taller diagonal in double crochet because the stitch itself is approximately twice the height of a single crochet.
Stitch-count Rules for Shaping
Use this basic equation to plan a row:
new stitch count = old stitch count + increases – decreases
A single increase usually adds one stitch. A two-together decrease usually removes one stitch. A three-together decrease removes two stitches because three bases become one finished stitch.
| Operation | Base stitches used | Finished stitches | Count change |
|---|---|---|---|
| sc increase | 1 | 2 sc | +1 |
| hdc increase | 1 | 2 hdc | +1 |
| dc increase | 1 | 2 dc | +1 |
| sc2tog | 2 | 1 sc | -1 |
| dc2tog | 2 | 1 dc | -1 |
| sc3tog | 3 | 1 sc | -2 |
The Craft Yarn Council’s standard abbreviation system identifies inc, dec, sc2tog, and dc2tog as pattern shorthand, but individual designers may define abbreviations differently. Read the pattern key before substituting a method, especially when “dec” might mean a specific invisible or stacked technique.
How to Work Common Crochet Increases
A crochet increase is made by completing two or more stitches in the same base stitch. The increase type must match the project’s stitch, because inserting two single crochet stitches into a double crochet pattern changes both stitch count and fabric height.
Single Crochet Increase
- Insert the hook into the next stitch.
- Yarn over and pull up a loop.
- Yarn over and pull through both loops to complete the first single crochet.
- Insert the hook into the same base stitch again.
- Complete a second single crochet.
The notation sc inc or 2 sc in next st normally means this operation. Mark the stitch after the increase when working a spiral round, because the second stitch can be mistaken for the next base stitch.
Half Double and Double Crochet Increases
A half double crochet increase consists of two hdc stitches in one base. A double crochet increase consists of two dc stitches in one base. Both methods preserve the stitch family used in the surrounding fabric.
For a double crochet increase, yarn over before entering the base stitch, pull up a loop, and complete the dc. Repeat in the same base stitch. Do not insert into the space between stitches unless the pattern specifically says to work into a chain space.
| Increase notation | Typical meaning | Common project | Visual result |
|---|---|---|---|
| 2 sc in next st | Two sc in one base | Amigurumi, bags | Compact expansion |
| 2 hdc in next st | Two hdc in one base | Hats, yokes | Medium-height expansion |
| 2 dc in next st | Two dc in one base | Shawls, blankets | Taller, more open expansion |
| 3 dc in next st | Three dc in one base | Shells, fans | Decorative flare |
| 5 dc in next st | Five dc in one base | Clusters, scallops | Strong local flare |
A three-, four-, or five-stitch increase is not interchangeable with several evenly distributed increases. A cluster concentrates width and often creates a shell, fan, ruffle, or point rather than a gradual curve.
Where Should Increases Go?
Place increases according to the shape required. Even distribution creates a smooth expansion, while placement at selected landmarks creates corners, raglan lines, points, or decorative texture.
For a 24-stitch row requiring four increases, place one increase approximately every six stitches. A practical sequence is:
- Work 6 stitches.
- Work an increase in the next stitch.
- Repeat the spacing pattern four times.
- Count the completed row and confirm 28 stitches.
The exact first and last spacing can vary by one stitch because of turning chains and pattern repeats. Symmetry matters more than forcing an identical gap at both edges.
How to Work Standard and Invisible Decreases
A crochet decrease combines partial stitches so that multiple base stitches produce one completed stitch. The standard method is useful for ordinary fabric and clear shaping, while the invisible decrease is preferred when the outside of the fabric must remain smooth.
Standard Single Crochet Decrease
- Insert the hook into the next stitch.
- Yarn over and pull up a loop, leaving two loops on the hook.
- Insert the hook into the following stitch.
- Yarn over and pull up a loop, leaving three loops on the hook.
- Yarn over and pull through all three loops.
This stitch is written as sc2tog, sc dec, or sc decrease. It removes one stitch from the total. Standard sc2tog can form a small horizontal bar or bump, which is often acceptable in blankets and garments.
Invisible Single Crochet Decrease
- Insert the hook under the front loop only of the next stitch.
- Insert the hook under the front loop only of the following stitch.
- Yarn over and pull through both front loops.
- Yarn over and pull through the two loops remaining on the hook.
The invisible decrease is normally worked from the outside of amigurumi. It hides the decrease line more effectively because the unused back loops remain behind the joined front loops. The technique does not eliminate every gap if stuffing is excessive or tension is loose.
Double Crochet Two Together
A dc2tog combines two partial double crochets into one completed double crochet:
- Yarn over and insert the hook into the next stitch.
- Yarn over and pull up a loop, creating three loops.
- Yarn over and pull through two loops, leaving two loops.
- Yarn over and insert the hook into the next stitch.
- Yarn over and pull up a loop, creating four loops.
- Yarn over and pull through two loops, leaving three loops.
- Yarn over and pull through all three loops.
The key control point is loop height. Pull each loop to the height of a normal double crochet. Short first loops make the decrease tight and distort the neighboring stitches; tall loose loops create a sagging diagonal.
| Decrease method | Loops or sections used | Typical surface | Best application |
|---|---|---|---|
| Standard sc2tog | Two complete stitch bases | Visible bar | Blankets, bags, flat fabric |
| Invisible sc decrease | Two front loops | Low-profile join | Amigurumi, dolls, spheres |
| hdc2tog | Two hdc partial stitches | Moderate diagonal | Hats, sweaters, yokes |
| dc2tog | Two dc partial stitches | Tall diagonal | Sleeves, necklines, lace |
| dc3tog | Three dc partial stitches | Strong taper | Points, shawls, dramatic shaping |
How Many Increases Make a Flat Circle?
A flat crochet circle remains approximately flat when each round adds enough stitches to compensate for the height and angle of the chosen stitch. A common starting rule is 6 increases per round in single crochet, 8 in half double crochet, and 12 in double crochet, although yarn, hook, tension, and stitch construction can change the result.
| Main stitch | Common starting increase | Typical starting chain or ring | Typical use |
|---|---|---|---|
| Single crochet | 6 per round | 6 sc in magic ring | Amigurumi base, coaster |
| Half double crochet | 8 per round | 8 hdc in ring | Hat crown, placemat |
| Double crochet | 12 per round | 12 dc in ring | Shawl center, blanket motif |
| Treble crochet | 16-18 per round | 16-18 tr in ring | Open lace circle |
| Linked double crochet | 10-12 per round | 10-12 linked dc in ring | Denser circular fabric |
These numbers are starting points, not universal laws. If the circle cups, the fabric needs more increases or a larger hook. If it ripples, the fabric has too many increases or the hook is too large.
Diagnosing a Circle That Curls or Ripples
Count after every round before changing the pattern. A 6-increase single crochet circle should gain six stitches per round when the pattern uses that construction.
| Symptom | Likely cause | First correction | Avoid |
|---|---|---|---|
| Bowl-shaped center | Too few increases | Add 1-2 increases next round | Pulling the fabric flat |
| Wavy outer edge | Too many increases | Remove 1-2 increases next round | Tightening only the final round |
| Six-sided shape | Increases align vertically | Offset increase positions | Randomly changing count |
| Spiral seam | Rounds are worked continuously | Join rounds or accept spiral | Miscounting as a defect |
| Hole at center | Magic ring is loose | Tighten tail and secure knot | Adding extra center stitches |
An expert rule of thumb is to change only one variable at a time. Altering stitch count, hook size, and tension in the same round hides the cause of the problem and makes the next correction unreliable.
How Does Shaping Change by Project?
The correct shaping method depends on whether the project needs a flat plane, a controlled slope, or a three-dimensional volume. A circle, sweater armhole, and stuffed sphere may all use increases and decreases, but each needs different spacing and tension.
Flat Circles and Squares
Distribute increases around the round for discs, coasters, mandalas, and blanket motifs. For a square, place increases at four corners, often by working 2 dc, chain 2, 2 dc into each corner space. Corner increases concentrate expansion at fixed points, so the sides remain comparatively straight.
Hats and Beanies
A hat crown usually increases until its diameter matches the intended head size, then continues with little or no increase. A typical adult beanie circumference is 20-23 inches, but negative ease of about 1-2 inches may be appropriate for stretchy fabric.
To estimate crown diameter:
target circumference divided by 3.14 = approximate crown diameter
For a 22-inch target circumference, 22 divided by 3.14 equals about 7 inches. Measure the actual fabric rather than relying only on round number because stitch height and elasticity affect fit.
Garment Panels and Sleeves
Garment shaping works best when increases and decreases are tied to measurements and gauge. If gauge is 4 stitches per inch, removing 8 stitches reduces a flat width by approximately 2 inches, before accounting for seam allowance and fabric stretch.
Place decreases one or two stitches inside the edge when a neat seam or armhole is required. This creates a stable edge stitch and reduces the staircase appearance caused by decreasing directly at every row end.
Amigurumi and Spheres
Amigurumi commonly uses single crochet in continuous rounds. Increase for the widest circumference, work even rounds to create length, then decrease symmetrically to close the form.
A basic sphere might use 6 sc in a ring, increase to 36 stitches, work several even rounds, and then decrease back to 6. The exact number of even rounds controls whether the result is a sphere, oval, or flattened ball.
Shawls, Blankets, and Borders
Shawls often increase at the center spine and both outer edges. A center increase may use a chain space or multiple stitches, while a straight blanket edge usually distributes increases only when a wider shape is wanted.
A border cannot correct a fundamentally miscounted body. If the final edge has too many stitches, forcing them into a smaller number of border spaces produces puckering rather than professional shaping.
Which Shaping Method Should You Choose?
Structural stitch shaping is usually the most predictable method because it changes the stitch count while preserving the chosen stitch family. Changing hook size, stitch height, or row construction can alter width, drape, and texture at the same time, so those alternatives require a gauge test.
| Method | Stitch count | Typical time to apply | Fabric effect | Best use |
|---|---|---|---|---|
| Even increases or decreases | Changes by 1 per operation | 1-5 minutes per row | Controlled curve | Circles, hats, garments |
| Hook size change | Unchanged | 2-10 minutes to test | Density and gauge shift | Minor ease adjustment |
| Stitch-height change | Often unchanged | 5-15 minutes to test | Slope and texture change | Shawls, leaves, borders |
| Short rows | Unchanged overall | 10-30 minutes to plan | Local depth or angle | Bust shaping, heels |
| Foundation chain adjustment | Starting count changes | 5-20 minutes | Entire width changes | Custom panels |
Changing hook size is not a substitute for precise shaping when a neckline, sleeve cap, or sphere must meet a specific measurement. A larger hook makes stitches wider and often looser, but it does not create the same geometry as adding a stitch.
Changing from single crochet to double crochet can create a slope because stitch height changes from row to row. That method may be ideal for a leaf or wedge, but the texture, yarn consumption, and drape will also change.
Cost, Yarn, and Time Effects
Increasing does not automatically require buying another skein. The effect depends on the number of shaped rows, stitch height, yarn weight, and project dimensions. Typical worsted-weight yarn costs about $4-$12 per skein in United States retail stores, while premium natural fibers often cost $12-$30 or more.
| Project example | Shaping pattern | Typical yarn range | Typical added time |
|---|---|---|---|
| 6-inch sc coaster | 6 inc rounds | 20-35 yards | 5-10 minutes |
| Adult worsted beanie | 6-10 crown rounds | 90-180 yards | 10-25 minutes |
| Small amigurumi | 6-12 inc and dec rounds | 50-120 yards | 20-45 minutes |
| Child sweater panel | 10-20 shaped rows | 500-900 yards total | 30-90 minutes |
| Medium dc shawl | Edge and center increases | 600-1,200 yards | 45-120 minutes |
These are typical planning ranges, not fixed consumption data. A tighter tension, taller stitch, textured yarn, or repeated frogging can change yardage substantially. Compare the label’s yards per skein rather than weight alone when budgeting.
Why Do Crochet Edges Become Uneven?
Uneven crochet edges usually result from inconsistent turning-chain treatment, misplaced stitches, concentrated shaping, or changing loop height during decreases. The most reliable repair is to identify the count error first, then decide whether the visual problem requires frogging or can be hidden by a border.
Stair-Step Edges
Decreasing at the row edge removes width abruptly and can create a visible staircase. Work one or two stitches before the edge, use the decrease there, and finish with a consistent edge stitch when the pattern allows that adjustment.
Turning chains create another source of irregularity. A pattern may count the chain as a stitch in double crochet but not in single crochet. If the chain counts, the first stitch is usually skipped; if it does not count, the first stitch is worked normally.
Accidental Stitch Creep
Stitch creep occurs when a crocheter works into a turning chain that should be skipped, works twice into the first or last stitch, or mistakes a slip stitch for a regular stitch. The count may increase by one each row, producing a diagonal edge rather than a deliberate curve.
Use a marker in the first and last actual stitch. In continuous rounds, move one marker after every completed round and place a second marker at each planned increase landmark.
Gaps and Loose Decreases
Loose loops expose stuffing in amigurumi and create holes in garments. Maintain the same loop height as surrounding stitches, reduce stuffing before the closing rounds, and use an invisible decrease when the pattern’s structure permits it.
Do not pull the working loop aggressively after a decrease. Excessive tension narrows the fabric at one point, while neighboring stitches remain loose and create a puckered ring.
Troubleshooting Table
| Visible problem | Count or technique check | Likely repair | Rework threshold |
|---|---|---|---|
| Edge gains 1 stitch per row | Check turning chain and last stitch | Mark first and last stitch | Rework after 2 incorrect rows |
| Circle ripples | Count increases per round | Remove 1 increase in next round | Rework if ripple exceeds 1 inch |
| Amigurumi holes | Check stuffing and decrease type | Use invisible decrease | Rework gaps larger than 2 mm |
| Slanted garment edge | Check increase spacing | Redistribute shaping | Rework if slope changes measurement |
| Bulky dc2tog | Check loop height | Pull partial loops to stitch height | Rework visible lumps over 3 stitches |
How Should You Track Shaping Accurately?
Accurate shaping requires a written stitch map, consistent markers, and a count taken at the same point in every round. Memory is unreliable when a round contains increases, decreases, turning chains, and skipped spaces.
Use this workflow for a new pattern or a translated pattern:
- Write the starting stitch count at the top of the row.
- Record every increase or decrease location.
- Calculate the expected ending count before crocheting.
- Place a marker at the first stitch and at repeated shaping landmarks.
- Count the row before turning or joining.
- Measure width, height, and circumference after every three to five rounds.
- Correct the first wrong count instead of compensating several rows later.
A shaping map might read: sc 4, inc, repeat 6 times, sc 4, starting with 28 stitches and ending with 34. The formula confirms six increases, so the final count must be 34.
Right-Side and Wrong-Side Shaping
The side on which a decrease is worked can change its visual direction. In rows, a decrease near the beginning and a decrease near the end may lean differently because the stitch bases are approached from opposite directions.
For symmetrical garment shaping, mirror the operation rather than blindly repeating the same written sequence. Many patterns use sc2tog on one side and a reversed decrease, sometimes called sc2tog through back loops or a specialized left-leaning decrease, on the other.
This distinction matters most in fitted necklines, armholes, and decorative panels. It matters less in a stuffed toy where the decrease line is hidden inside a seam or placed on the underside.
Expert Rules for Cleaner Shaping
The most useful shaping improvements come from controlling geometry rather than merely following decrease abbreviations. Experienced crocheters measure the fabric, preserve edge stitches, and adjust one factor at a time.
- Keep a stable edge stitch when shaping flat panels.
- Offset circular increases when vertical spokes become too pronounced.
- Test an invisible decrease on the project yarn before committing to an entire amigurumi.
- Count stitches after every shaping round, not only at the end of the piece.
- Use blocking only after correcting the stitch count.
- Mark increase groups with removable markers when the repeat exceeds 24 stitches.
- Reduce stuffing gradually during amigurumi decreases instead of compressing it at the final opening.
An important counterintuitive point is that a larger hook does not reliably flatten a rippling circle. It can make the fabric looser while leaving the incorrect increase geometry unchanged. Correct the count first, then alter hook size if the fabric density remains unsuitable.
A second practitioner rule concerns yarn tension. Pulling decrease loops tight often feels like improving neatness, but it creates a narrow ring that resists stuffing and distorts the next round. Matching the loop height to adjacent stitches produces a smoother result than tightening the final pull-through.
A third rule concerns symmetry. A mathematically even distribution can look uneven when the turning chain counts as a stitch or when the first and last stitches have different heights. Use the pattern’s structural landmarks, then verify the finished measurement.
Frequently Asked Questions About How to Increase and Decrease in Crochet
Can I Increase or Decrease Without Changing the Stitch Pattern?
Yes. A crocheter can preserve the surrounding stitch family while adding two stitches into one base or combining two partial stitches into one. The fabric will change width or circumference, but single crochet, half double crochet, or double crochet texture remains consistent when the matching operation is used.
Why Is My Crochet Circle Turning Into a Hexagon?
A crochet circle can look hexagonal when increases align above one another in consecutive rounds. The stitch count may still be correct. Offset the increase positions, or work the pattern’s increases in alternating locations, so the expansion distributes across more angles instead of forming visible vertical spokes.
Should I Use a Magic Ring for Increase Rounds?
A magic ring is useful when a round begins at a closed center, especially for amigurumi, motifs, and circular bases. A chain ring or adjustable loop also works. The choice affects the center opening, not the increase arithmetic. Secure the ring tail firmly because repeated shaping can pull on the first round.
How Do I Translate a Pattern From Single Crochet to Double Crochet?
Do not replace every single crochet with double crochet without recalculating the increase rate. Double crochet is taller and usually needs more increases to remain flat. Make a gauge swatch, compare the diameter after three rounds, and adjust the number and placement of increases before converting the full project.
Can a Crochet Border Hide an Incorrect Stitch Count?
A border can disguise a small edge irregularity, but it cannot reliably correct major count errors. If the final edge differs by one or two stitches, a pattern may absorb the difference through skipped spaces or corner placement. Larger differences usually cause puckering, stretching, or uneven corners and should be repaired first.
How Do I Know When to Stop Increasing a Hat?
Stop increasing when the crown diameter reaches the target circumference divided by 3.14, then work even rounds for the hat’s height. For a 22-inch head, a crown near 7 inches is a reasonable starting measurement. Adjust for stretch, yarn behavior, and the wearer’s preferred negative ease.
Conclusion
How to Increase and Decrease in Crochet is a matter of controlled stitch arithmetic, consistent loop height, and deliberate placement. Use increases to expand fabric, decreases to contract it, and stitch markers to verify every count. For flat circles, begin with the appropriate increase rate; for garments and amigurumi, prioritize measurements, symmetry, and the correct decrease style.