Before you stitch

What hoop size do I need for an embroidery design?

A design sold as 5 × 7 can measure 132 mm across, and a hoop called 5 × 7 can stitch a little less than its name suggests. The size you need comes from two numbers, and neither of them is on the listing.

What hoop size do I need for this design?

The smallest hoop whose stitchable area is comfortably larger than the design’s real width and height in millimetres. Two numbers decide it: what the design measures, which is stored in the file itself, and the biggest area your machine can actually stitch, which is in its manual. The inches on the product listing decide nothing.

Open the design in Hoopside and the size is the line under the file name — 41.5 × 96.1 mm, to a tenth of a millimetre, read out of the design’s own extents. Underneath, next to the stitch count and the colour stops, it names the smallest common hoop that holds it: 100 × 100 mm, 130 × 180 mm, 200 × 200 mm, or no standard hoop when the design is larger than all three. Opening a design and reading those figures is free.

Standard machine embroidery hoop sizes, in millimetres

Hoops are sold by an inch nickname and built to a millimetre size, and the two do not match. The nicknames round in both directions.

Sold as	Actually	Which is
4 × 4	100 × 100 mm	3.9 × 3.9 in — under its name
5 × 7	130 × 180 mm	5.1 × 7.1 in — over its name
6 × 10	160 × 260 mm	6.3 × 10.2 in — over its name
8 × 8	200 × 200 mm	7.9 × 7.9 in — under its name

So a 100 mm hoop will not take a design that is a true 4 inches wide, while a 130 mm one has a few spare millimetres over 5. Worse, the nickname is not even unique: hoops marketed as 6 × 10 are sold at both 160 × 260 mm and 150 × 240 mm, which is a centimetre of difference under one label. Measure in millimetres and the ambiguity disappears.

Hoop size and sewing field are not the same number

The size on the box describes the frame. What matters is the sewing field: the area inside it the needle can actually reach. The presser foot and the needle bar need clearance at the edges, so the field is always smaller than the frame, by a few millimetres on each side.

Two consequences, and both bite:

A design whose measurements exactly equal a hoop’s millimetre size does not fit that hoop. It needs a slightly bigger one.
The exact field is a property of your machine, not of the hoop, so the number lives in your manual. Two machines taking the same 130 × 180 hoop can stitch slightly different areas inside it.

Find the field for each hoop you own, write it on a sticker, and keep it with them. It is the one number you will check every time, and the only place it is authoritative is the manual.

How to find out how big the design really is

Every machine format stores coordinates in tenths of a millimetre, so a design’s extents are a fact in the file rather than a claim in a description. A viewer reads them and does the arithmetic. That is why the measured size and the seller’s inches disagree so often: the inches were rounded by a person, and the millimetres were written by the software that exported the design.

One subtlety worth knowing: a design can be turned. A design measuring 170 × 96 mm is too wide for a 130 × 180 hoop as it stands, and fits perfectly rotated a quarter turn. Hoopside’s hoop line already accounts for that — it tries both orientations before it says a design fits — and so should you when you are checking by hand. What the other figures on that screen tell you about whether a design is worth starting is in reading a design before you stitch.

Which hoop when two of them fit?

The usual advice in the trade is the smallest hoop the design fits in, and it is good advice. A smaller hoop holds the fabric tighter over a shorter span, which helps a dense fill lie flat, and it uses less stabiliser and less fabric per run. A tiny motif floating in the middle of a big hoop is the easiest way to get a wrinkle.

The exception is a design that only just fits the smaller hoop. If it clears the field by a millimetre or two, go up a size: hooping is never perfectly centred, and a design that fits on paper can still catch the foot.

What if the design is bigger than your biggest hoop?

There are three honest answers, and none of them is a conversion.

A bigger hoop, if your machine supports one. The machine’s maximum field is a limit of the machine, so check what it accepts before buying.
Split the design and stitch it in sections, repositioning the fabric between them — multi-position hooping. Each section has to fit the field, the stitching order has to survive the split, and the sections need generous overlap to line up. It is done in desktop embroidery software; splitting is a real editing job, not a setting.
Find the design in a smaller size. Many sellers include several sizes in one pack, which is the cheapest fix of the three and the one people forget to look for.

What Hoopside will and will not do here

It reads the design’s real size in millimetres, and names the smallest of 100 × 100, 130 × 180 and 200 × 200 mm that holds it in either orientation — or says plainly that none of them does. All of that is free.

It does not know which hoops your machine has, and it does not know your exact sewing field; those come from the manual. It does not resize a design, and it does not split one into sections. Converting a design to another format changes the encoding, never the dimensions: a 200 mm design is still 200 mm afterwards.

The two-minute check before you hoop

Four things, in this order, all of them before the fabric comes out:

The real size, in millimetres, read from the file rather than the listing.
Against the field, not against the hoop’s nickname — and in both orientations.
With a margin. If it clears by a millimetre, treat it as not fitting.
Then the rest: the stitch count for the area, and the colour stops you will need to supply.

A design that is too big for the hoop is one of the reasons a machine turns a design down, and some models simply refuse without explaining why; the rest of the causes, in the order worth checking, are in why your machine rejects an embroidery file. If you would rather have the figures on paper beside the machine, the printable thread chart prints the hoop line with them — that one is part of the one-time unlock, where viewing is free.

Stitch count, size and hoop fit: reading a design before you stitch — What the numbers on a design mean, and which ones decide whether it is worth starting.
Why your machine rejects an embroidery file — Six reasons a design will not load, in the order worth checking.
Printing a thread chart for an embroidery design — Why a printed colour-stop list beats a phone at the machine, and what belongs on it.

Read a design’s real size before you hoop

Hoopside opens PES, DST, JEF, EXP, VP3, XXX and PEC designs on Android and shows each one the way it will stitch — real size, stitch count, numbered colour stops and the thread list. Viewing is free, with no ads and no account, and nothing leaves your phone.