Filament Fineness (DPF) Calculator — Denier/Filament · Dtex/Filament

From total denier (or dtex) and filament count, find the fineness of a single filament and see its microfibre/normal/coarse class.

Formula

DPF = total denier ÷ filament count · dtex/filament = total dtex ÷ filament count. Classes: < 1 denier/filament (≈ < 1.1 dtex/filament) is microfibre, 1–2 is fine, 2–7 is normal, ≥ 7 is coarse. Example: 150/48 → 150 ÷ 48 = 3.125 denier/filament.

Worked example

Yarn 150/48: 150 ÷ 48 = 3.125 denier/filament. On the dtex side 150 denier = 166.7 dtex, and 166.7 ÷ 48 = 3.47 dtex/filament. Since 3.125 sits in the 2–7 normal range, the yarn is a normal-fineness filament. Split the same 150 denier across 144 filaments and 150 ÷ 144 = 1.04 denier/filament → inside the fine band (1–2), bordering microfibre.

Frequently asked questions

What does 150/48 mean?

The first number is the total fineness (150 denier), the second is the filament count in the bundle (48). Dividing gives the fineness per filament: 150 ÷ 48 = 3.125 denier/filament. Spreading the same 150 denier over more filaments (e.g. 150/144) makes each filament finer and softens the fabric.

How many denier per filament is microfibre?

Microfibre is a filament finer than 1 denier per filament (about < 1.1 dtex/filament). For example 100/144 → 100 ÷ 144 = 0.69 denier/filament is microfibre; 150/48 → 3.125 is not.

How does DPF affect the fabric?

Low DPF (fine, many filaments) gives a softer hand, better cover and drape, and a more matte look. High DPF (coarse, few filaments) gives a firmer hand and a fuller, more durable structure. With total denier fixed, raising the filament count lowers DPF.

What if I enter dtex instead of total denier?

The logic is identical: dtex/filament = total dtex ÷ filament count. Denier and dtex relate by dtex = denier × 1.111; the microfibre threshold reads as < 1 in denier and ≈ < 1.1 in dtex.