How Print Quantity
Changes the Economics.

Two different cost structures, not two prices for the same thing

The offset-versus-digital decision is really a question about how each process’s cost is structured, not which one is inherently cheaper. Every print job has a fixed cost (paid once, regardless of quantity) and a variable cost (paid again for every additional piece). The two processes split those very differently.

Offset: expensive to start, nearly free to continue

Offset’s fixed cost is real and it is paid before the first good sheet comes off the press: imaging a plate for every ink color, mounting those plates, and running makeready — adjusting ink and water balance and running sheets, discarded, until color and registration settle in. All of that happens once, whatever the run length. After it, the variable cost per additional sheet is comparatively tiny: mostly the paper and ink actually consumed, with the press running at production speed. Average cost per piece is the fixed cost divided by the quantity, plus that small variable cost — a curve that drops steeply at first and then flattens as the fixed cost spreads over more and more pieces.

Digital: almost nothing to start, a steadier cost per piece

A digital press images each impression straight from the file, so there is no plate to make and only a token amount of makeready — a calibration sheet or two, not a full press setup. Its fixed cost is small. But its variable cost per impression is comparatively higher and stays close to constant across the run, because toner or ink consumption and machine time scale almost linearly with the number of pieces rather than dropping off the way offset’s does. Plotted against quantity, digital’s cost-per-piece line is close to flat.

Where the lines cross

Put offset’s steeply dropping curve next to digital’s nearly flat one and they cross at some quantity. Below that crossover point, digital’s total cost is lower, because offset has not yet spread its fixed cost thin enough to catch up. Above it, offset is cheaper, and it keeps getting relatively cheaper the further past the crossover you go, because its fixed cost keeps dividing over a larger number while its variable cost per piece barely moves.

Total cost vs. cost per piece - a common confusion

These are genuinely different numbers, and mixing them up is the most common mistake in this decision. Offset’s total cost is front-loaded and can be higher than digital’s even at a fairly small quantity, purely because of the fixed setup cost — exactly why running fifty pieces offset is usually a poor decision even though the marginal hundred-and-first sheet is nearly free. The crossover question is about which process wins at your specific quantity, not about which process is cheaper in the abstract.

What moves the crossover point

• Number of colors. More ink colors on offset means more plates and more units to make ready, which raises the fixed cost and pushes the crossover to a higher quantity.
• Sheet size and press. Different presses carry different setup costs.
• Stock. An unusual or difficult-to-feed stock can add makeready time on either process.
• Complexity. A job needing tight registration across multiple colors takes longer to make ready than a simple one-color piece.

There is no single crossover number that applies to every job, which is why a quote asks for the specifics rather than quoting a formula.