Every quotation eventually reduces to a number per square foot, and most shops arrive at it by dividing last month's invoice by last month's output. That produces an average, not a cost, and it cannot tell you whether a particular job made money.

This guide sets out how to build the number properly: why it is not a price list, what the published ink figure covers, how to move between square metres and square feet, what belongs beside ink, how machine time and yield enter the calculation, how waste is counted, and how to structure the result so it survives a customer conversation.

Why is a cost per square foot not a price list?

Because it depends on the job, not the machine.

Two shops running the same model produce different costs per square foot, since the number is built from the job mix, the yield, the labour and the waste rate.

The machine sets a floor. Ink and media have a published or purchased cost, and no amount of efficiency drives the cost below them. Everything above that floor is decided by how the work is organised: how many parts fit on a sheet, how long loading takes, how often the run is interrupted, how many pieces are rejected and what share of the rent the job has to carry.

That is why a single industry benchmark is misleading. A shop printing large simple panels has a very different cost structure from a shop printing small personalised parts, even if both use the same platform. The number is a property of the operation rather than of the machine, and it has to be built in the shop.

What does the published ink figure cover?

Ink only, at roughly 0.80 to 1.20 USD per square metre.

The published figure for this range is an ink cost per square metre, and it excludes media, machine time, labour, waste and overhead.

Reading the scope of a published figure correctly is the first discipline in costing. A number that covers ink only is useful because it is verifiable and stable, and it is dangerous when it is mistaken for a total. The published material and process guidance for this range repeats the same caution in other contexts: a specification describes one variable, not the whole job.

The practical use is as an anchor. Take the printed area of the job, apply the published ink cost, and you have the ink element. Then add the other elements from your own records. A quote built that way can be defended line by line, which is the difference between a price and an assertion.

How do you move between square metres and square feet?

One square foot is about 0.0929 square metres.

The published figures are metric, so the area of a job is converted once and then multiplied by the cost per square metre rather than by a pre-converted number.

The common error is to convert the final price rather than the area. Converting the area keeps the arithmetic traceable, because every element is still expressed in the unit it was measured in. Converting the total hides the assumptions inside a single number and makes the quote impossible to audit when a customer asks why it changed.

What belongs beside ink in the calculation?

Media, time, labour, waste and overhead.

Ink is the smallest and most visible element, while media, machine time, direct labour and waste usually decide the total cost of the square foot.

Media is the easiest to count and the most sensitive to layout, because the sheet is bought whole and sold by the part. Machine time is the element most often omitted, because the machine is already paid for and the hour feels free. Labour is the element most often underestimated, because loading and inspection happen around the print rather than during it. Waste is the element most often assumed away. Overhead is the element that keeps the shop open.

The published guidance for this range gives a way to establish the time element: time the complete representative batch rather than the print, because loading, positioning, artwork changes, curing, unloading and inspection all sit inside the real cycle. Once that figure exists, the machine cost can be divided by the hours the batch actually consumes.

How should machine time be costed?

From a timed batch, divided by usable hours.

The published guidance is to time the complete batch including loading and inspection, then divide the machine cost by the hours that batch actually consumes.

Three inputs are needed. The annual or monthly cost of owning and running the machine, including depreciation, power, service and consumables that are not priced per job. The usable hours in the period, after maintenance and idle time. And the hours a representative batch consumes, measured rather than assumed.

Dividing the first by the second gives an hourly rate. Multiplying that by the batch hours and dividing by the parts produced gives a machine cost per part, which can then be expressed per square foot. The published caution about headline speed applies here: a quoted output figure describes one workflow, not your batch, so the rate has to come from your own timing.

How does yield change the cost?

It changes the media share of every part.

A layout that leaves material on the sheet raises the cost of every part cut from it, which is why nesting and yield belong in the same calculation.

The arithmetic is straightforward. If a sheet produces eight parts and the layout could produce ten, the media cost carried by each part is a quarter higher than it needs to be. That difference is invisible in a quote built from invoice averages, and it is exactly the kind of gap that makes a busy shop unprofitable.

The published nesting guidance for this range addresses the same problem from the production side: review the largest panel, the most frequent panel and the changeover pattern, and treat the layout as part of the job rather than as a detail of the file. Where a customer supplies the sheet, the yield question belongs in the conversation about who pays for the offcut.

How is waste included?

As a measured rate, not a guess.

Setup, test prints and rejects each consume ink, media and time, and the measured reject rate turns those into a cost that the quote can carry.

Three sources belong in the rate. Setup, which includes the sample print and any test pieces produced before the run is released. Rejects, which the published inspection discipline is designed to catch early rather than late. And the difference between the sheet and the sellable parts, which is the yield question above.

The published inspection and acceptance guidance is what produces the rate: a shop that records rejects by reason can price the risk into the unit cost, while a shop that records only a total cannot. That is the same discipline that makes a repeat order predictable, applied to money instead of quality.

What does a worked structure look like?

Area times ink, plus media, time, labour and waste.

A useful structure adds the elements in a fixed order, then divides by the sellable area so the result is a cost per square foot rather than per sheet.

Start with the printed area in square metres and the published ink cost per square metre. Add the media consumed, divided across the sellable parts. Add the machine hours multiplied by the hourly rate. Add the direct labour for loading, inspection and packing. Add the measured waste share. Add the overhead allocation. Divide the total by the sellable area and convert the result to square feet if the customer quotes in feet.

Two refinements make the structure more useful. Keep a separate line for any finishing, because cutting, routing, edging and assembly are labour and machine time in their own right. And keep a line for the customer-specific requirements that change the process, such as a durability test or a colour tolerance, because those are real costs that a generic rate hides. The method behind this structure is set out in more detail in the guide to job costing and quotation, and the ink element itself is covered in the article on UV ink cost per square metre.

Where the finished goods are exported, the landed cost also carries freight, duty and customs handling, and the trade requirements are summarised by the relevant authority (trade.gov). Process practice for industrial print is published by the bodies in the field (PRINTING United Alliance, Fogra), colour management guidance comes from the International Color Consortium, chemical obligations for the inks follow the applicable regulations (REACH), and occupational guidance for the workshop is published by the relevant authority (HSE printing).

What the decision comes down to

A cost per square foot is built in five layers: ink from the published figure, media from the layout, time from a timed batch, labour from the real handling, and waste and overhead from the shop's own records. Convert the area once, keep every element visible, and divide by what the customer can actually sell.

The published ink and platform figures for this range sit with the AJ1206 and AJ2513G/R pages, and the two companion guides are UV ink cost per square metre and job costing and quotation.