Yarn Count Converter (Ne/Nm/Tex)
Industrial indirect-to-direct yarn count conversions.
The number printed on the cone or spec sheet.
29.5 Tex
The common base every system is reduced to.
- Denier
- 265.7
- Nm (metric)
- 33.9
- Ne (cotton)
- 20
- Mass
- 30 g / km
- Yield
- ~16799 yd / lb
Tex and Denier are direct systems, so a larger number means a heavier yarn, while Nm and Ne are indirect, so a larger count means a finer one. Converting everything to Tex first is the safe way to compare a supplier figure against a pattern note written in a different language entirely.
About This Tool
The Yarn Count Converter bridges the industrial numbering systems that describe how thick a yarn is, taking a figure written in any one of them, the cotton count Ne, the metric count Nm, Tex or Denier, and restating that single yarn across all four plus the grams per kilometre and the yards per pound a supplier sheet quotes.
You type the count exactly as it appears on a cone.
You pick which of the four systems wrote that number.
It reduces everything to a shared Tex base first.
The answer ends a yarn bought wrong because a foreign count looked alike.
Two families count a fixed weight, and two count a fixed length.
Confusing those families is where costly ordering mistakes actually begin.
One Tex value lets a mill spec and a pattern note agree at last.
Why Yarn Count Converter (Ne/Nm/Tex) Math Matters
Yarn is sold under several numbering systems with no single global standard.
A number that looks alike can mean a very different actual thickness.
Tex and Denier are direct, so a larger figure is a heavier yarn.
Nm and Ne are indirect, so a larger count marks a finer yarn instead.
Wrong yarn weight changes fabric density, drape and the final cost.
Knitting or weaving to the wrong count warps gauge and ruins sizing.
Reading every label as one Tex value stops repeat ordering errors.
Knowing a number's family is the whole skill of buying yarn right.
The Formula
Every count is first reduced to Tex, the grams in one thousand metres of yarn, so Tex stays itself, Denier divides by nine, Nm becomes one thousand over the count, and cotton Ne becomes about five hundred ninety over the count, after which the tool can rebuild each of the other systems from that single base value.
- Tex —
- the direct weight giving grams for one thousand metres
- Denier —
- the direct weight giving grams for nine thousand metres
- Yield —
- the length in yards that a single pound of that yarn holds
Because two systems weigh a fixed length while the other two measure a fixed weight, the bare number never tells fine from heavy on its own, and only the family a figure belongs to reveals whether a rising value means a thicker or a far finer thread.
Worked Example: Step by Step
- 1A cone is labelled as twenty Ne cotton-count yarn.
- 2You enter twenty and choose Ne as the counting system.
- 3The tool reduces that to a Tex near twenty nine and a half.
- 4It restates the same yarn at about two hundred sixty six Denier.
- 5The metric Nm reads close to forty two for that yarn.
- 6Its yield prints near sixteen thousand yards per pound weight.
- 7A mill sheet quoted in Tex now matches your cone exactly.
- 8Comparing the shared Tex value proves the two yarns truly agree.
- 9Had you only weighed them you would still fear a costly mismatch.
- 10So one foreign count unlocks the real thickness behind the printed label.
How to Use This Calculator
- Find the count number printed on your yarn cone or band.
- Choose which of the four systems wrote that number.
- Type the figure into the tool and read the four restatements.
- Compare the Tex value when matching two differently labelled yarns.
- Use the yield figure to check a supplier weight listing.
- Confirm the fibre before trusting a cotton-based Ne too closely.
Key Terms
- Tex
- a direct system giving the grams in one thousand metres of yarn
- Denier
- a direct system weighing nine thousand metres of a single strand
- Metric count
- the indirect Nm number counting metres held in one gram
- Cotton count
- the indirect Ne figure counting hanks per defined weight
- Direct system
- a scale where a bigger number means a heavier yarn
- Indirect system
- a scale where a bigger number means a finer yarn
- Yield
- the length a fixed weight of yarn contains, often yards per pound
- Turn per inch
- the twist density often quoted beside a count on spec sheets
Yarn Count Converter (Ne/Nm/Tex) Reference Table
| System | Family | Bigger number means |
|---|---|---|
| Tex | direct | heavier yarn |
| Denier | direct | heavier yarn |
| Nm / Ne | indirect | finer yarn |
The Ne conversion shown here assumes cotton, the fibre the cotton-count system was built around, so a wool or synthetic yarn of the same Nm reads a little differently on the Ne scale. For exact matching, weigh a known length or trust the Tex figure, which stays honest across every fibre you might buy.
Common Mistakes & Pro Tips
- Assuming a bigger number always means a thicker yarn across all four systems.
- Confusing the indirect Nm or Ne with the direct Tex or Denier families.
- Ordering a matching cone by eye on the number while ignoring the named system.
- Applying the cotton Ne factor to a synthetic and misreading its true size.
- Mixing Denier and Tex in a buying note so the yarn weight comes out wrong.
- Skipping the yield check that a mill sheet quotes in yards per pound.
- Never comparing the Tex value, the one figure that reads alike everywhere.
- Weighing a known length only after a project is already badly underway.
Real-World Use Cases
- Matching a discontinued cone by its Tex value today.
- Reading a European Nm mill note against a US Ne yarn.
- Checking a supplier yield sheet against a sample.
- Confirming a Denier-labelled yarn suits a fine knit.
- Comparing two cones sold under different numbering systems.
- Sourcing an exact replacement for a weaving warp.
- Teaching why a larger count can mean a finer yarn.
Yarn Count Converter (Ne/Nm/Tex): Frequently Asked Questions
What is the difference between Tex and Denier?
Both are direct weight systems, but Tex weighs one thousand metres while Denier weighs nine thousand. Denier is always nine times the Tex figure, and in both a larger number means a heavier yarn.
Why does Nm get finer as it rises?
Nm is an indirect system measuring how many metres fit in one gram, so more metres per gram means a finer yarn. That is the opposite of Tex, where a larger number marks a heavier thread.
How do I match two differently labelled yarns?
Convert both to one system, usually Tex, and compare those figures directly. A yarn at a given Ne equals a fixed Tex, so the shared Tex value reveals whether the two cones genuinely agree.
Is the cotton count Ne exact for wool?
Not quite, since the Ne scale was defined around cotton. Wool and synthetics differ in density, so treat Ne as a close guide and confirm any match against the Tex figure instead.
What does the yield number mean?
Yield is the length held in a set weight, often yards per pound, so a fine yarn shows a very large number. It lets you check a mill weight listing against your own sample quickly.
This page explains how the yarn count converter (ne/nm/tex) works, what each input means and where the numbers come from, so you can plan your next make with confidence.
Written by Bobbin & Form Editorial Team
Home sewists & machine-embroidery practitioners
Reviewed by Marie Delacroix
Custom sewist & machine-embroidery technician, 15 years at the machine
Formulas follow standard sewing and needlework references. Results are estimates — always confirm against your pattern and a pre-washed swatch.
Sources & further reading
- Threads Magazine — fabric cutting & yardage guides
- ISO 13934 — textile tensile & fabric property standards
- Your local fabric store's bolt-width charts