What is throat space on a sewing machine?

How throat space is measured

Throat space is usually given as the horizontal distance from the needle to the inside of the machine's body, sometimes along with the height from the bed to the underside of the arm. Makers may call it workspace, harp space or throat space.

Some brands quote the distance from the needle to the right side of the opening, others the full working area. Compare like with like, and check whether the figure is in millimetres or inches (25.4 mm per inch). Janome, for example, lists the MC1000 with 18 cm from the right of the needle and 11 cm arm height.

Typical sizes

These are general ranges for each class of machine. Individual models vary.

When more throat space helps

Throat space matters most for quilting large projects. When you quilt the centre of a double quilt, half of it must be rolled up under the arm. A wider throat means the roll fits more easily, you fight less drag and you can quilt larger areas before repositioning. It also helps with heavy curtains and bulky home furnishings.

For dressmaking, small crafts and lap size quilts, a standard throat is fine. Extra throat space adds weight and size, so it is not worth paying for unless you quilt larger projects regularly.

Other features that help with large quilts

Throat space is not the only thing that makes big quilts manageable. An extension table gives a large flat surface around the needle and supports the weight of the quilt; see sewing machine extension tables explained. A knee lifter lets you lift the foot while both hands hold the quilt.

A walking foot or built-in dual feed keeps layers moving together, and a stitch regulator helps with free motion. Our best sewing machines for quilting guide compares machines with large throats and these features, and quilting frames explained covers frame quilting.

See machines for quilting →

How to choose

Ask yourself these questions before paying for extra throat space.

• What is the largest quilt you make, and how often?
• Do you quilt the whole quilt yourself or send large quilts to a long arm service?
• Do you have a table big enough to support the quilt on the left and behind?
• Can you lift and store a heavier, larger machine?
• Would an extension table and walking foot solve the problem on your current machine?

Making the most of the space you have

Good handling can make a standard throat feel larger. Roll or fold the quilt neatly under the arm rather than stuffing it in, and support its weight on a table to the left and behind the machine so it does not drag. Quilt from the centre outwards, so the bulk under the arm reduces as you go.

Break the quilting into sections, and choose designs that do not need long continuous lines across the whole quilt. Quilt as you go methods, where blocks or rows are quilted separately and joined afterwards, avoid fitting a full quilt under the arm at all. Our how to machine quilt for beginners guide covers these techniques.

Frequently asked questions

What is a good throat space for quilting? For regular quilting of single or double quilts, around 20 cm or more makes a noticeable difference. Smaller quilts can be quilted on standard machines.

Is harp space the same as throat space? Yes. Makers use throat space, harp space and workspace for the same open area to the right of the needle.

Which sewing machine has the largest throat? Long arm quilting machines have the largest. Among domestic machines, large throat quilting models from Janome, Juki and Brother have the biggest workspaces.

Does throat space matter for dressmaking? Very little. Free arm access and feed quality matter more for garments.