Short answer: density is the spacing between rows of thread. About 0.40 mm between same-direction rows is the standard starting point for 40 wt thread. Go more open (0.45–0.5 mm) on light, stretchy or small work, and tighter (0.36–0.38 mm) only where fabric shows through. At standard density, a square inch of tatami fill with underlay comes to roughly 1,200 stitches, and an inch of satin column 130–200, depending on width.
Density and stitch count are the two numbers people ask about most, for opposite reasons. Density decides how the design looks and feels. Stitch count decides how long it takes to sew, and so what it costs. Both are set while you digitize.
What "density" actually measures
Density is the distance between neighbouring rows of thread, measured in millimetres. A smaller number means denser stitching. Software doesn't all measure it the same way:
- In a satin column, the stitches zig across and zag back. Measured between stitches going the same direction (peak to peak), 0.40 mm is standard. Measured between every stitch, the same column reads 0.20 mm.
- In a tatami fill, rows run back and forth, so the same two conventions apply.
When you copy a density value from a tutorial or another program, check which convention it uses. Mixing them up doubles or halves your stitch count.
Starting values by fabric
| Fabric | Spacing (same direction) | Why |
|---|---|---|
| Twill, canvas, structured caps | 0.40 mm | Stable: standard coverage |
| Pique polo | 0.40 mm | Textured; underlay matters more than density |
| Jersey tees | 0.42 mm | Stretchy: lighter to avoid puckering |
| Performance / dri-fit | 0.45–0.48 mm | Thin: heavy stitching puckers it |
| Fleece, towels | about 0.36 mm | Pile swallows stitches: tighter, plus knockdown |
| Leather | about 0.6 mm | Every needle hole is a perforation |
Adjust per object, not just per design. Small satin columns (under about 2 mm) sew cleaner a little more open, because the stitches at the column edges crowd together on tight curves. Large fills on soft fabric often look better slightly open too.
Too dense or too light?
- Too dense: stiff, "bulletproof" embroidery, thread breaks, needles deflecting, puckering around the design, and on caps, stitches cutting the fabric.
- Too light: fabric or underlay showing between rows, a washed-out look, and edges that look ragged.
If fabric shows through, fix underlay first. A proper edge run plus tatami underlay often solves coverage without adding top stitches. Then tighten density in small steps (0.02 mm at a time).
How to estimate stitch count
Stitch count comes mostly from how much area is filled solid, not from how big the logo looks. We measured EasyDigitizer's output at standard density (0.40 mm) to give working numbers:
| Element | Stitches |
|---|---|
| 1 square inch of tatami fill, no underlay | about 970 |
| 1 square inch of tatami fill, with underlay | about 1,200 |
| 1 inch of 1.5 mm satin column | about 150 |
| 1 inch of 3 mm satin column, with underlay | about 180 |
| 1 inch of 6 mm satin column, with underlay | about 200 |
| 1 inch of running stitch (2.5 mm) | about 10–20 |
So a 3.5″ left-chest logo that's mostly lettering might sew in 5,000–8,000 stitches. Put a solid 3.5 × 1.5″ panel behind it and you add another 6,000 or so. Note that satin stitch count barely changes with width: a satin column costs stitches by length, while a fill costs them by area.
How to reduce stitch count without hurting quality
- Drop solid backgrounds. Let the garment colour be the background. This is almost always the biggest saving.
- Turn large fills into satin outlines where the design allows it.
- Remove hidden stitching. Where a later object fully covers an earlier one, cut the earlier one out underneath. Stacked layers add stitches and stiffness and cause thread breaks.
- Use lighter underlay on small objects. A centre run is enough under narrow satins.
- Shrink slightly. Fill stitches scale with area, so going from 4″ to 3.5″ wide cuts about a quarter of the fill stitches.
- Don't over-tighten density to fix coverage; fix underlay instead.
How long will it take to sew?
Divide the stitch count by the machine speed, then add time for colour changes and trims. Commercial machines run around 700–1,000 stitches per minute on flat goods and 500–650 on caps. A 10,000-stitch logo is about 12–15 minutes at 800 spm once you include a few colour changes and trims, per head. Fewer trims and colour changes often save more time than fewer stitches.
In EasyDigitizer
Density, underlay and pull compensation start from the garment you pick, and you can override them on any object. The status bar shows the live stitch count, trims, colour changes and an estimated sew time for your machine speed, so you can see what removing a background or resizing does before you export.
Frequently asked questions
What is a good embroidery density?
0.40 mm between same-direction rows is the standard for 40 wt thread. Adjust from there by fabric: more open for light and stretchy fabrics, a little tighter for fleece and towels.
How many stitches are in a square inch of embroidery?
At standard density, about 1,000 for a tatami fill without underlay and about 1,200 with underlay. Denser settings and pattern fills go higher.
Does a bigger logo always have more stitches?
No. A small, solid-filled logo can easily out-stitch a larger outline or lettering logo, because fill stitches scale with area.
Why is my embroidery so stiff?
Usually too much density or stacked layers. Open the spacing a little, cut out hidden areas under later objects, and check you're not using heavy underlay on a light fabric.