How to Increase (INC) in Amigurumi

An amigurumi increase (INC) is two single crochets worked into the same stitch — the only technique that transforms flat rounds into the three-dimensional spheres, heads, and bodies that amigurumi is built from. This article teaches you the exact mechanics, how to read increase notation in patterns, and how to track your stitch count so every round stays on shape. By the end, you will place increases correctly and confidently in any amigurumi pattern.

The first time I tried a sphere, it came out looking like a flying saucer. Flat in the middle, flaring at the edges, completely wrong. I had placed every increase correctly — but in the wrong stitches. That one positional error ruined the shape entirely. Understanding not just how to work an amigurumi increase, but exactly where to place it, is what this article is here to fix.

What Is an Amigurumi Increase and What Does It Do

An amigurumi increase (INC) is two single crochets worked into the same stitch, adding one stitch to the total count — and it is this controlled stitch addition that expands a flat circle into a three-dimensional curved surface.

How Two Single Crochets in One Stitch Creates Shape

When you work a standard single crochet, you use one stitch from the previous round and produce one new stitch in the current round. The count stays equal, and the fabric grows straight up without changing width. When you work an amigurumi increase, you use one stitch from the previous round but produce two new stitches in the current round. The total count rises by one.

Do that six times across a round, and you add six stitches to the circumference. Do it in the next round at the right intervals, and you add six more. That systematic circumference expansion is exactly how a flat circle becomes a dome — and eventually a full sphere. The increase does not change how the stitch works. It only changes how many stitches you place in a single location.

Why Increases Are the Core Shaping Tool in Amigurumi

Amigurumi shaping is almost entirely controlled by two operations: increases and decreases. Increases expand the piece outward as you build from the magic ring toward the widest point of the form. Decreases contract the piece inward as you close the form toward its base. Every head, body, arm, and leg you will ever make follows this same structure — expand with increases, hold steady for a cylindrical section, then contract with decreases.

This means that mastering the amigurumi increase is not a preliminary skill you will leave behind. It is a technique you will use in every round of shaping in every project, indefinitely. Getting it right from the start matters for every piece you will ever make.

The Difference Between an Increase and a Regular Stitch

Visually, a completed increase looks like two V shapes sitting side by side on top of a single stitch base. A regular single crochet shows one V sitting on one stitch base. When you look down at a completed increase round from above, you can see where each pair of Vs appears — those are your increase points, and they should be evenly distributed around the circle.

If you understand the single crochet well, you already know how to work an increase — the increase is just two of them. For a full breakdown of the single crochet mechanics underlying this technique, see the guide to the single crochet stitch.

For context on where increases fit within the full beginner skill sequence, the complete beginner’s guide to amigurumi maps every technique in the order you will learn them.

How to Work an Amigurumi Increase — Step by Step

Working an increase requires no new technique — you work a standard single crochet into a stitch, then immediately work a second single crochet into that exact same stitch before moving forward to the next stitch.

Step 1 — Work the First Single Crochet Into the Stitch

Identify the stitch your pattern designates as the increase stitch. Insert your hook under both loops of that stitch in the standard way. Yarn over, pull up a loop — two loops on hook. Yarn over again, pull through both loops. One single crochet complete. Do not move to the next stitch. Your hook is still positioned at the stitch you just worked into, and you need to stay there.

The first single crochet of an increase looks and feels exactly like any other single crochet. There is no visual cue yet that this stitch will become an increase. That is what makes positional accuracy so important — the increase point is determined by your count, not by anything visible in the stitch itself.

Step 2 — Work the Second Single Crochet Into the Same Stitch

Re-insert your hook into the exact same stitch you just worked into — the same two loops, the same location. Yarn over, pull up a loop. Yarn over, pull through both loops. One more single crochet complete. You have now worked two single crochets into one stitch. That is the complete amigurumi increase. Move to the next stitch in the pattern.

The re-entry on the second single crochet can feel slightly tighter than the first because the stitch has already been partially worked. On a 2.5mm (approx. US C/2) hook with fingering-weight mercerized cotton, this tightness is especially noticeable. Do not pull the loop up larger to compensate — keep the loop height consistent with every other stitch in the round.

How to Confirm the Increase Was Worked Correctly

After completing the increase, look at the top of the stitch you just worked into from directly above. You should see two distinct V shapes emerging from one stitch base — two sets of front and back loops sitting side by side. If you see only one V, you worked only one single crochet. If you see three Vs, you accidentally worked into the stitch a third time or into an adjacent stitch.

Emma’s experience shows that the most reliable confirmation method for beginners is to count the V tops after each increase immediately rather than waiting until the end of the round. Catching a missed or extra stitch at the point of the error takes five seconds to fix. Catching it at the end of a full round requires frogging the entire round.

Emma’s Pro Tip: On mercerized cotton with a 2.5mm hook, the second single crochet of an increase can feel like it barely fits. It does fit — the stitch is designed to hold two. If you are fighting to re-enter, your first stitch was too tight. Aim for snug, not locked, on every stitch in an increase round.

How to Read Increase Instructions in Amigurumi Patterns

Amigurumi patterns write increases as “INC” or “2 sc in next st” — both notations mean the same two-single-crochet action, and reading the full round instruction before you begin is what prevents misplaced increases that distort your shape.

Common Increase Notations and What They Mean

You will encounter several ways patterns indicate an increase. All of them mean the same thing:

• INC — the most common shorthand. Work 2 single crochets into the next stitch.
• 2 sc in next st — written out in full. Identical action to INC.
• inc — lowercase version of the same abbreviation. No difference in execution.
• [sc, sc] in next st — bracket notation used by some designers. Still two single crochets in one stitch.

Some patterns also write the round as a formula such as “(sc, INC) × 6” — which means you alternate one regular single crochet with one increase, repeating that pair six times around the round. The parentheses contain the repeating unit and the number after the multiplication sign tells you how many times to repeat it.

How Increases Are Distributed Across a Round

In a correctly written amigurumi pattern, increases are distributed at equal intervals around the round. If a round calls for 6 increases evenly spaced across 12 stitches, there will be one single crochet between each increase. If it calls for 6 increases across 18 stitches, there will be two single crochets between each increase. The spacing is what keeps the shape round rather than hexagonal or lopsided.

After testing dozens of handwritten and self-designed patterns, the most common error in beginner-written patterns is uneven increase distribution — and the result is always visible in the finished piece as a slightly flattened or polygonal shape rather than a true sphere. Follow the published pattern’s distribution exactly.

Reading a Full Increase Round From Start to Finish

Before beginning any increase round, read the entire round instruction first. Identify how many stitches the round starts with, how many increases are called for, and what the total stitch count should be at the end. Then calculate: starting count plus number of increases equals ending count. If your math does not match the pattern’s stated ending count, reread the round before you begin — not after you have already worked it.

For example: Round 3 reads “(sc, INC) × 6 — 18 sts.” You start with 12 stitches (from round 2). The pattern calls for 6 increases within a (sc, INC) pair repeated 6 times: 12 regular stitches plus 6 increase stitches added equals 18. The math confirms the pattern. Begin the round.

How Increases Build the Amigurumi Sphere Shape

Every standard amigurumi sphere follows a predictable increase formula where each shaping round adds a fixed number of stitches at evenly spaced intervals — expanding the piece symmetrically outward from the magic ring until it reaches maximum circumference.

The Standard Sphere Increase Formula Explained

The most common amigurumi sphere begins with a magic ring and 6 single crochets. Every subsequent increase round adds 6 stitches to the total count — one increase per original stitch segment. The formula looks like this:

• Round 1: 6 sc into magic ring — 6 sts
• Round 2: INC × 6 — 12 sts
• Round 3: (sc, INC) × 6 — 18 sts
• Round 4: (sc, sc, INC) × 6 — 24 sts
• Round 5: (sc, sc, sc, INC) × 6 — 30 sts

The pattern is consistent: each increase round adds one more regular single crochet between increases than the previous round did. This even, incremental spacing is what produces a smooth, symmetrical dome. For a complete walkthrough of the magic ring that begins this sequence, see the guide to how to make a magic ring.

Why Even Spacing of Increases Matters for Round Shapes

If increases are clustered together rather than evenly distributed, the fabric accumulates extra width in one area and not others. The result is a piece that curves more sharply in some sections and less in others — producing an egg shape, a flattened disc, or a lumpy irregular form instead of a sphere. The math of even distribution is what guarantees roundness. This is why reading the full round before you begin is non-negotiable.

How Many Increase Rounds a Typical Head or Body Requires

For a standard amigurumi head worked with fingering-weight yarn on a 2.5mm (approx. US C/2) hook, most patterns use 5 to 6 increase rounds to reach the maximum circumference — typically 36 to 42 stitches across at the widest point. The piece then holds that circumference for several straight rounds before the decrease rounds begin to close the form.

Larger pieces — bodies, oversized heads — may require 7 or 8 increase rounds to reach a wider circumference. The number of increase rounds is directly proportional to the final size. A pattern that specifies a gauge will tell you exactly how many rounds to work. Always follow the pattern’s stitch counts rather than estimating visually.

Common Amigurumi Increase Mistakes and How to Fix Them

The three most common increase errors are working the increase into the wrong stitch, missing the second single crochet so only one stitch is added, and over-increasing which causes the fabric to ruffle — each has a direct fix.

Working the Increase in the Wrong Stitch

Placing an increase one stitch early or one stitch late shifts its position relative to the other increases in the round. Do that across multiple increase points and the spacing becomes uneven. Across multiple rounds, uneven spacing accumulates into a visibly asymmetrical piece.

The fix is counting. Before working each increase, count from your stitch marker to confirm you are at the correct stitch. On rounds written as “(sc, INC) × 6,” count every single crochet and every increase worked so far in the round — you should always be able to verify your position within the repeating pair. If your count does not match where you think you are, do not guess. Frog back to the last increase point you are certain of and recount from there.

Accidentally Working Only One Single Crochet Into the Stitch

A missed second single crochet — working one SC instead of two into the increase stitch — produces no increase at that point. The stitch count at the end of the round will be one less than the pattern states. One short stitch across one round is enough to start pulling the fabric inward rather than outward, and the shape will begin to deviate from round.

The prevention is the two-V confirmation check immediately after each increase. If you complete an increase and see only one V top on the base stitch, you missed the second single crochet. Re-enter the same stitch and work the missing single crochet before moving on — as long as you catch it immediately, the fix takes three seconds.

What Ruffling Tells You About Your Increase Placement

Ruffling — fabric that waves, flares, or refuses to lie flat — means too many stitches were added relative to the circumference of the form. In practical terms, it means extra increases were worked that the pattern did not call for, or the same stitch was used as an increase point more than once in a round.

If you see ruffling appear partway through an increase sequence, frog back to the last flat round and recount the total stitches. If the count is higher than the pattern states, you have extra stitches from over-increasing. Frog the over-increased round, recount from the previous correct round, and work the increase round again following the pattern notation exactly. A flat circle expanding smoothly is the visual confirmation that your increase count and placement are both correct.

Tracking Your Increases to Keep Stitch Count Accurate

After every increase round your stitch count must match the pattern exactly — one missed or extra increase changes the total, and that error compounds with every subsequent round until the piece no longer matches the intended shape.

How to Count Stitches After an Increase Round

After completing an increase round, count every stitch before moving to the next round. Insert the tip of your hook briefly into each stitch top as you count — the physical contact eliminates the visual skip errors that counting by eye produces. Count the V tops, not the stitch bases. Two V tops emerging from one base is one increase point that contributed two stitches to your total count.

Your final count should match the number stated at the end of the round in your pattern. If it does not, identify whether you are over or under by how many stitches, then frog back to find the error before continuing. One off-count stitch not caught now becomes a shape problem that cannot be fixed six rounds later.

Using a Stitch Marker to Anchor Your Round Boundary

In continuous rounds, the end of one round and the beginning of the next are marked only by your stitch marker. Without it, you will not know when an increase round has been completed — and working an extra or fewer increase than specified because you lost your round boundary is one of the most common sources of stitch count errors in beginner amigurumi.

Place your stitch marker in the first stitch of every round, immediately after working it. Move it — never remove it — at the start of each new round. The marker is your only objective evidence of where the round begins and ends. Treat it as non-negotiable equipment on every increase round, not just when the count gets complicated.

What to Do When Your Count Does Not Match the Pattern

Do not continue past a round with an incorrect stitch count. The shape distortion that results from one extra or missing increase compounds with every round that follows — the piece will not self-correct, and there is no way to fix a shape error from the outside once the piece is stuffed and closed.

When your count is off: first, recount carefully using hook-tip contact on each stitch. Counting errors in the count itself are more common than actual stitch errors. If the recount confirms the discrepancy, frog back to the previous correctly counted round and rework the increase round. Once the correct stitch count is confirmed, the next step after mastering increases is learning the invisible decrease — the technique that closes every form increases have built.

The amigurumi increase is a small action with an enormous structural consequence. Every sphere, head, and body you will ever make depends on these two single crochets placed in the right stitch at the right interval, round after round. Master the placement as carefully as the mechanics, and the shapes will follow.

Ready to take your next step? Learn how to work the invisible decrease and build on what you just mastered.

Frequently Asked Questions About Amigurumi Increases

What does INC mean in an amigurumi pattern?

INC stands for increase. In amigurumi, it means working two single crochets into the same stitch instead of one. This adds one stitch to the total count at that position. You may also see it written as “2 sc in next st” or “inc” — all three notations mean the same two-single-crochet action in the same stitch.

How do I know I worked the increase into the right stitch?

Count from your stitch marker to confirm your position before working each increase. On rounds written as repeating pairs like “(sc, INC) × 6,” verify that you are at the second stitch of each pair before working the increase. If your count within the repeat matches the pattern notation, you are in the correct stitch. Never place an increase based on visual estimation alone.

Why does my amigurumi look ruffled after the increase rounds?

Ruffling means too many stitches were added — usually from working extra increases, accidentally working into spaces between stitches, or misreading the round notation. Frog back to the last flat round, recount your total stitches, and compare to the pattern’s stated count for that round. Work the increase round again following the exact pattern notation, counting after every increase pair.

Do I need to use a stitch marker on increase rounds?

Yes — on every round without exception, including increase rounds. In continuous rounds, the stitch marker is the only evidence of where one round ends and the next begins. Without it, you risk working more or fewer increases than the pattern calls for because you cannot accurately identify your round boundary. Move the marker to the first stitch of each new round before proceeding.