Silk is sold by weight more often than by a single “light” or “heavy” label. Two systems show up on product pages: momme (a traditional silk measure) and GSM (grams per square meter). Knowing both helps you match a yardage listing to the garment you plan to sew.
What momme means
Momme (often abbreviated mm) is a Japanese unit used for silk. It describes how much silk is in a standard length and width of fabric. A higher momme number means denser, usually more opaque, and often more durable silk. Lower momme silk is lighter, sheerer, and more delicate to sew and wear.
Momme is the most common weight label on silk bolts and online listings for silk types such as habotai, charmeuse, chiffon, and crepe de chine.
What GSM means
GSM means grams per square meter. It is a metric fabric-weight measure used across many fiber types, not only silk. One square meter of fabric is weighed in grams. Higher GSM means a heavier fabric for that area.
If you already compare cotton, linen, or wool by GSM, the same number system applies to silk. That makes GSM useful when you are switching between silk and other materials for a similar silhouette.
How to translate momme to GSM
As a working rule of thumb, multiply momme by about 4.3 to estimate GSM. Exact listings can vary slightly by weave and finish, so treat conversions as a guide rather than a laboratory measurement.
Example: 19 momme × 4.3 ≈ 82 GSM. On the chart below, 19 momme is listed as 82 GSM.
When a seller lists only momme, use the chart to find the nearest GSM. When a seller lists only GSM, divide by about 4.3 to estimate momme, then check the chart for the closest match.
Silk weights and typical garment uses
Weights overlap by weave. A 12 momme charmeuse and a 12 momme crepe do not sew or drape the same way. Use the ranges below as project starting points, then confirm hand and opacity with a swatch when you can.
Very light: about 5–8 momme (about 22–35 GSM)
Common types: habotai (China silk), silk organza, some chiffons.
Typical uses: linings, underlinings, sheer overlays, scarves, gathered blouses with soft volume, and interlining layers that should add little bulk.
Sewing notes: Use fine needles (often size 60/8–70/10), a walking foot or tissue under the fabric if it shifts, and French or rolled seams when the edges will show. Many of these weights benefit from a lining or underlining for opacity in garments.
Light: about 8–12 momme (about 35–52 GSM)
Common types: chiffon, georgette, lightweight habotai, some silk organza blends by feel.
Typical uses: blouses, soft skirts, evening overlays, bias-cut pieces that need float, and dress layers where translucency is part of the design.
Sewing notes: Stabilize necklines and armholes. Test stitch length on a scrap. Sheer fabrics show every press mark, so press carefully with a press cloth.
Light-to-medium: about 12–16 momme (about 52–69 GSM)
Common types: crepe de chine, lightweight charmeuse, some silk satins.
Typical uses: blouses, shirts, dresses, wide-leg pants with soft drape, and slip dresses. This range is a frequent “everyday silk” zone for garments that need fluid movement without extreme sheerness.
Sewing notes: Crepe de chine is often more stable to cut than satin. Charmeuse can shift on the bias; pin generously and consider a rotary cutter on a single layer.
Medium: about 16–22 momme (about 69–95 GSM)
Common types: charmeuse, silk satin, some silk twills, midweight crepe.
Typical uses: dresses, skirts, tailored blouses, pajama sets, coat and jacket linings that need more substance, and garments where opacity matters without adding jacket-level weight.
Sewing notes: This range usually covers better than lighter silk. It still prefers sharp needles and clean finishes. Understitch facings so they stay flat.
Medium-heavy: about 22–30 momme (about 95–130 GSM)
Common types: heavier charmeuse and satin, silk twill, some dupioni and shantung depending on weave density, silk noil in denser weaves.
Typical uses: structured dresses, trousers, jumpsuits, light jackets, tailored skirts, and pieces that need the fabric to hold a silhouette.
Sewing notes: Heavier silk can take more pressing and more structured seams. Match interfacing weight carefully so the hand stays balanced.
Heavy silk for structure: about 30+ momme (about 130+ GSM)
Common types: dense silk twill, heavy satin, some suitings and specialty weaves.
Typical uses: jackets, coats, structured trousers, formal dresses that need body, and accessories that need lasting shape.
Sewing notes: Treat these closer to other midweight fashion fabrics for needle size and seam finishes, while still protecting the surface from shine marks when pressing.
Quick project map
| Project goal | Start around |
|---|---|
| Sheer blouse or overlay | 6–10 momme |
| Soft everyday blouse or dress | 12–16 momme |
| Opaque dress or slip with more coverage | 16–22 momme |
| Soft trousers or jumpsuit | 16–25 momme |
| Jacket, coat lining with substance, or structured dress | 22–30+ momme |
Weave still decides the final result. Organza at a low momme is crisp; charmeuse at a mid momme is fluid. Always read the fiber content, weave name, and width alongside the weight.
Momme to GSM conversion chart
| Momme | GSM |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 13 |
| 4 | 17 |
| 5 | 22 |
| 6 | 26 |
| 7 | 30 |
| 8 | 35 |
| 9 | 39 |
| 10 | 43 |
| 11 | 48 |
| 12 | 52 |
| 13 | 56 |
| 14 | 61 |
| 15 | 65 |
| 16 | 69 |
| 17 | 74 |
| 18 | 78 |
| 19 | 82 |
| 20 | 87 |
| 21 | 91 |
| 22 | 95 |
| 23 | 100 |
| 24 | 104 |
| 25 | 109 |
| 26 | 113 |
| 27 | 117 |
| 28 | 122 |
| 29 | 126 |
| 30 | 130 |
| 31 | 135 |
| 32 | 139 |
| 33 | 143 |
| 34 | 148 |
| 35 | 152 |
| 36 | 156 |
| 37 | 161 |
| 38 | 165 |
| 39 | 169 |
| 40 | 174 |
| 41 | 178 |
| 42 | 182 |
| 43 | 187 |
| 44 | 191 |
| 45 | 195 |
| 46 | 200 |
| 47 | 204 |
| 48 | 208 |
| 49 | 213 |
| 50 | 217 |
| 51 | 221 |
| 52 | 226 |
| 53 | 230 |
| 54 | 234 |
| 55 | 239 |
| 56 | 243 |
| 57 | 247 |
| 58 | 252 |
| 59 | 256 |
| 60 | 260 |
Use the chart when you are comparing a silk listing in momme to another fabric listed in GSM, or when you want a shared weight language across fibers.
A practical way to choose
- Name the garment and how opaque you need it to be.
- Note the weave (chiffon, crepe, charmeuse, twill, organza, and so on).
- Match a momme or GSM range from the sections above.
- Confirm with a swatch for hand, drape, and opacity in your lighting.
Silk weight is one decision among several. Fiber quality, weave, finish, and pattern ease all affect the finished garment. Weight gets you into the right family so those other choices are easier to make.
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