Free · No sign-up · 8–30 cm
Resize an amigurumi pattern without touching a calculator
Set any finished height from 8 to 30 cm and every round count, stitch count, yarn estimate and safety eye size is recomputed from the shape itself.
Ask a room full of crocheters what they wish existed and one answer keeps winning: a way to take an amigurumi pattern and make it bigger — or smaller — without redoing all the math. People have asked Reddit for an online calculator that resizes amigurumi patterns for years, and the honest answer has always been "no such thing, here's how to do it by hand."
This page is the better answer. The amigurumi pattern generator builds every toy from an actual 3D shape, so resizing isn't an edit to the text — it's a rebuild. Move the size slider and the whole pattern is recomputed from the geometry. Keep reading for why the manual way hurts, what the tool recalculates for you, and one honest caveat about what "resize" means here.
Why resizing an amigurumi pattern by hand hurts so much
A flat chart scales with a photocopier. An amigurumi pattern doesn't, because it's not a picture — it's a schedule of increases and decreases. Double the size and every round needs new stitch counts, but you can't just double each number: the shaping rate has to change too. A sphere that grows by 6 stitches per round becomes a different sphere at double size — same principle, different rhythm — and if you keep the original "inc every 3rd stitch" cadence your bigger toy comes out pointy, or lumpy, or quietly wrong in a way you only discover at round 30.
Then the collateral damage. More rounds means the assembly instructions ("sew the head at R6") point at rounds that no longer make sense. The yarn estimate is off — and not linearly: yarn use grows roughly with the surface area, so a toy twice as tall needs about four times the yarn, not two. The safety eyes are now the wrong size for the head. Every one of these is a separate little math problem, and getting any of them wrong costs an evening.
That's the pain people are actually describing when they search for an amigurumi resize calculator: not laziness, just the entirely reasonable wish to never re-derive a sphere again.
How to make an amigurumi bigger or smaller the easy way
The generator sidesteps the whole problem by never storing stitch counts at all. Your toy lives as a 3D shape — a set of rounded pieces with real centimeter dimensions. When you set the finished height anywhere from 8 to 30 cm, the engine slices that shape into rounds at a standard amigurumi gauge and writes a brand-new pattern for exactly that size. The increase and decrease rhythm falls out of the geometry, so the shaping stays smooth at every scale.
In practice: open the generator, start from the doll base or animal base (or build your own from the 8 base shapes), and drag the size slider. The written pattern, the assembly steps and the materials list update live. Print the 8 cm version for a keychain, the 30 cm version for a pillow-sized cuddle — both from the same design, both with stitch counts that add up.
There's also a second, older way to resize that pairs nicely with the first: keep the pattern and change the yarn. The same instructions worked in super bulky yarn with a 6.5 mm hook come out noticeably bigger than in sport weight with a 2.5 mm hook. Pattern-first resizing gives you exact control; yarn-first resizing gives you a different fabric feel. Experienced amigurumi makers use both.
What the amigurumi resize tool recomputes for you
Everything that depends on size, which turns out to be nearly everything: the number of rounds per piece, the stitch count at the end of every round, where the increases and decreases fall, the assembly steps (re-referenced to real round numbers at the new scale), the yarn estimate per piece with sewing allowance, the stuffing weight, and the recommended safety eye size — 6 mm for toys up to 10 cm, 9 mm up to 20, 12 mm up to 30.
What it doesn't change is the design. Proportions are preserved because the shape itself scales uniformly — your bear at 25 cm is the same bear as at 12 cm, just bigger. The 3D preview shows the resized toy before you commit, so there are no surprises after round one.
One honest note: it regenerates, it doesn't convert
This tool resizes by rebuilding your toy from shapes at a new size. It does not take an existing written pattern — a PDF you bought, a chart from a book — and rewrite its numbers. Nobody's tool reliably does that, because a written pattern doesn't contain the shape it describes; the geometry has to come from somewhere, and here it comes from the 3D editor.
So the honest workflow is: recreate your idea with the base bodies and shape library (usually a ten-minute job — most amigurumi are a handful of rounded pieces), then resize freely forever. If your goal is to double-check a written pattern you already own, the pattern stitch checker verifies its stitch counts against the math — a different tool for that different job.
Stop resizing by hand
Pick a base body, drag the size slider to any height from 8 to 30 cm, and print a pattern that was computed for that exact size.
Frequently asked questions
Can I upload an existing PDF pattern and resize it?
No — and be suspicious of any tool that claims to. A written pattern doesn't contain the 3D shape it describes, so its numbers can't be reliably recomputed. This tool resizes by regenerating: you build (or start from a ready-made base body) in the editor, and the size slider recomputes every round from the actual geometry. Recreating a design from the base shapes takes about ten minutes; after that, resizing is free forever.
What happens to my gauge when I resize?
Nothing — that's the point. The resized pattern assumes the same standard amigurumi gauge (worsted weight yarn, 4 mm hook, 16 sc × 18 rounds = 10 cm) and changes the round and stitch counts to reach the new size. Your hands, yarn and hook stay the same. If you also switch yarn weight, you get a second resizing effect on top: same instructions, chunkier fabric, bigger toy.
How do safety eye sizes change when I resize?
They scale with the finished height, using the tiers safety eye sellers actually stock: 6 mm for toys up to 10 cm tall, 9 mm up to 20 cm, and 12 mm up to 30 cm. The materials list picks the right size automatically — a resized 25 cm bear won't tell you to buy the 6 mm eyes its 9 cm sibling uses.
How do I estimate yarn for the new size?
You don't have to — the materials list recomputes yarn amounts per piece, with sewing tails included. If you're sanity-checking: yarn use scales roughly with the toy's surface area, so a toy twice as tall takes about four times the yarn, not double. That non-obvious jump is exactly why hand estimates go wrong and why the estimate lives in the pattern.
Does resizing change the shape of my design?
No. The 3D shape scales uniformly, so all proportions — head-to-body ratio, ear length, belly chub — are identical at every size. What changes is how the shape is sliced into rounds: more, smaller-increments rounds for a bigger toy. Check the live 3D preview after moving the slider; what you see is exactly what the pattern makes.