Screen Printing Mesh Count Calculator: Mesh for Your Ink, Halftones and Fine Lines

How it works

Halftone mesh ≈ LPI × 4 to 5 (minimum 4×) · Fine-line mesh ≈ 2 × 25.4 ÷ line width (mm) · Maximum mesh set by the ink particles · Recommended = next standard count above the largest need, within the ink range · Theoretical ink volume (cm³/m²) = open area × mesh thickness (µm) · Wet deposit ≈ ink volume + EOM thickness · Ink per print (mL) = deposit (µm) × area (m²)

Mesh count (threads per inch, or per cm in Europe) sets two things at once: how much ink goes down and how fine a detail the screen can hold. Coarse mesh has big openings and a thick deposit for opacity, glitter and puff. Fine mesh has small openings for halftones and thin lines but lays down a thin film. The right count is boxed in from both sides. The ink particles must pass the openings, so glitter needs 25–60, metallics 110 or coarser and standard plastisol prints well up to about 230, while thin water-based and graphic UV inks go much finer. Halftone dots need enough threads to sit on: the common rule is a mesh of 4 to 5 times the line screen (45 lpi → 180–225, so a 230 is the safe choice), and a line should span at least two thread pitches. The calculator takes the largest of these needs, rounds it up to a standard mesh count and keeps it within the ink’s range. It then reads thread diameter, opening, open area and thickness from a standard-thread polyester mesh data sheet. The theoretical ink volume is open area × thickness, and the stencil (emulsion over mesh) adds its thickness to the wet deposit. One micron of wet deposit is one millilitre per square metre, so ink use is the deposit times the print area, plus waste.

Worked example

Standard plastisol with a 45 lpi halftone and 0.5 mm fine lines. Halftone: 45 × 4.5 = 202.5 mesh (minimum 45 × 4 = 180). Lines: 2 × 25.4 ÷ 0.5 = 102 mesh. The largest need is 202.5, so the next standard count is 230 mesh (91 threads/cm), within plastisol’s 110–230 range. The 156 you have is below the 180 minimum, so the halftone will fill in. Through the 156 (thread 64 µm, open area 30.1%, thickness 101 µm) the ink volume is 30.4 cm³/m², and a 15% stencil adds 101 × 0.15 = 15.15 µm, for a wet deposit of about 45.6 µm. 200 prints of 300 cm² use 45.55 × 0.03 = 1.37 mL each, so 0.34 L (0.09 US gal) with 25% waste, about 585 prints per litre.

Sources: ScreenPrinting.com: what mesh count to use for halftones (4–5 × LPI) · Solutions for Screen Printers: halftone-to-mesh moiré control · Monofilament polyester printing mesh data sheet (thread, open area, thickness, ink volume) · Printavo: screen printing mesh guide (thread diameter, thin-thread mesh)

Frequently asked questions