How Much Ink Do You Actually Need for a Print Run
Running out of ink halfway through a 200-piece order is one of those mistakes you only make once. Mixing a custom color takes time, and matching a second batch to the first by eye is a gamble. The good news is that ink use is predictable enough to estimate before you start, once you break it down into what's actually happening on the screen.
It comes down to volume, not guesswork
Every stroke of the squeegee pushes a thin layer of ink through the open mesh and onto the garment. That layer has a thickness — the "wet deposit" — which depends mostly on your mesh count and how hard you're pressing. Multiply the print's area by that thickness and you get a volume; multiply the volume by the ink's density and you get a weight. Scale that up by how many pieces you're printing, and you have a real number to work from instead of a guess.
Plastisol is a thick paste, so it lays down a noticeably thicker wet deposit than water-based or discharge ink, which are formulated to sit into the fabric rather than on top of it. That's why a plastisol job and a water-based job of the same size and quantity can use meaningfully different amounts of ink even with identical artwork.
A worked example
Take a 10×10 inch chest print, 50 pieces, in plastisol. A typical wet deposit through a mid-range mesh is around 0.1mm. The area is 100 square inches, which converts to roughly 645 square centimeters. Multiply by a 0.1mm (0.01cm) deposit and you get about 6.45 cubic centimeters of ink per print. Plastisol runs around 1.45 grams per cubic centimeter, so that's roughly 9.4 grams per print — call it 470 grams before any waste allowance for a run of 50.
That last part matters: no shop uses every gram they mix. Some stays behind in the screen after the last pull, some goes into testing the color match, and some clings to the stencil instead of transferring. A 15% waste allowance is a reasonable default for an experienced printer; a beginner running a lot of test prints might want to budget more.
Why mesh count changes the math
A more open, low mesh count (say 86–110) lets a thicker layer of ink through per stroke, which is why bold spot-color art on a low mesh count tends to use noticeably more ink than fine detail through a tight, high-count mesh. If you know your setup runs thicker or thinner than the typical figure, adjust your deposit-thickness estimate accordingly rather than relying on a one-size-fits-all number.
Buying with a margin, not a guess
Once you have a per-print estimate, round up to account for color mixing, testing on scrap fabric, and the ink left in the screen when the job is done. Buying a bit more than the bare-minimum calculation is almost always cheaper than stopping a run to remix a color and hoping the second batch matches the first exactly — plastisol and water-based inks can shift slightly between batches even with a careful hand.
Keeping a running log
The fastest way to get better at this over time is to weigh your ink before and after a run and write down what you actually used against what you estimated. After a handful of jobs across different mesh counts and ink types, you'll have your own real-world deposit-thickness figures instead of textbook defaults — and your estimates will only get tighter from there.
An ink coverage calculator does this math for you in seconds, but understanding the volume-and-density logic behind it means you can sanity-check any number it gives you, and adjust it confidently when your own setup runs a little differently than the defaults assume.