Lace Yarn Weight Guide
Lace weight is CYC category 0 — the finest weight in regular production, sometimes called cobweb or thread weight for the very finest end of the range. It's thin enough that a full skein looks deceptively small next to a worsted-weight ball, while actually holding several times the length: a typical 100-gram lace skein runs 800-1,100 yards, against roughly 190-225 yards for the same weight in worsted.
Gauge
Standard lace-weight gauge is 33-40 stitches per 4 inches in stockinette (about 8.25-10 stitches per inch) and 32-42 stitches per 4 inches in single crochet. At the midpoint of that range, a plain stockinette hat sized to an average adult head would take roughly 331 yards by the same gauge-based model used across this site — a genuinely large yardage for a small project, which is the core trade-off of working this fine: gorgeous stitch definition and drape, at a real time and yarn-management cost.
Recommended needles and hooks
US 000-1 needles (1.5-2.25mm) and steel 1.6-1.4mm to B-1 crochet hooks. This is a genuinely different tool range than most other weights on this site — steel crochet hooks in particular are a distinct product line from standard aluminum hooks, sized on their own numeric scale.
Typical put-ups
Lace-weight skeins are almost always sold in 100-gram put-ups rather than 50-gram, because a 50-gram lace skein would be an awkwardly small amount of usable yardage for most lace projects. Expect 800-1,100 yards per 100 grams, with the exact figure depending heavily on fibre — a silk or bamboo lace yarn drapes and yields differently than a wool one at the same nominal weight.
What lace weight is good for
Shawls, wraps, and fine lace doilies are the classic uses — anything where an open, airy, heavily blocked lace pattern is the whole point of the project. It's a poor choice for anything meant to be structurally sturdy or quick to finish; a lace-weight sweater is a real undertaking, both in stitch count and in hours.
Blocking matters more here than at any other weight
Lace fabric is dramatically transformed by blocking — an unblocked lace swatch can look tight and unremarkable, while the same fabric pinned out wet opens into the pattern's actual intended lace structure. Never judge a lace project's finished look, or its finished gauge, before blocking; see how blocking changes your gauge for the general mechanics.
How it compares to fingering weight
Fingering (CYC category 1) is the next weight up and the more commonly stocked "fine" option for garments like socks and shawls that still want some structure — lace is finer again, with noticeably more stitches per inch and correspondingly more time invested per square inch of fabric. If a pattern calls for lace and you're unsure whether your fingering-weight stash yarn is close enough, swatch and compare against lace's 33-40 stitches per 4 inches range rather than assuming adjacency in the CYC numbering means the gauges are close.
FAQ
Is cobweb weight the same as lace weight? Cobweb is generally used for the very finest end of what CYC groups into category 0, thinner again than a typical lace-weight yarn — both share the same CYC category number, but "cobweb" signals an even finer specific yarn within it.
How much lace-weight yarn does a shawl typically need? Commonly in the 400-1,000+ yard range depending on the shawl's size and how open the lace pattern is — open lace patterns use less yarn per square inch than a denser stitch would, which partly offsets lace weight's fine gauge. Use the Yarn Quantity Estimator with your actual swatch for a number specific to your pattern.
Can I hold two strands of lace weight together to substitute for fingering? It's a reasonable approximation for gauge purposes, though the resulting fabric will behave somewhat differently (two thinner plies rather than one yarn engineered at that thickness) — always swatch the doubled strand rather than assuming it behaves identically to a true fingering-weight single strand.