1. How much ink does a plotter actually use? — you are here
2. Why one cartridge always runs out first
3. How much plotter ink should you buy?
There are only two ways to get plotter ink wrong. You run out of matte black at 4pm on a Thursday with a tender submission on the machine. Or you have AED 9,000 of yellow sitting in a cupboard, slowly going past its date, because someone ordered "a full set" without asking what a full set actually means for your work.
Both problems come from the same mistake: buying ink by the cartridge count instead of by what you actually print. A plotter doesn't consume ink per page. It consumes ink per square metre, and the amount varies by more than 50× between a mono CAD drawing and a full-bleed photograph on gloss.
This three-part guide gives you the numbers, the arithmetic and a calculator that turns them into an order. Part one covers the numbers: what a print actually costs in millilitres. Part three turns that into what you should buy.
1. Stop counting prints. Start counting square metres.
"We do about 400 plots a month" tells you almost nothing. Four hundred A3 proofs and four hundred A0 site plans differ by 16× in area. Four hundred mono drawings and four hundred colour renders differ again, on top of that.
Every usable ink figure in this article is expressed as millilitres per square metre (ml/m²) — total ink across all channels combined. It is the only unit that survives a change of paper size, and it converts to anything else with one multiplication.
2. The five ink tiers
Wide-format work sorts cleanly into five bands. The spread between the lightest and heaviest is the single biggest driver of what you should order.
Bands derived from wide-format ink-coverage thresholds (0–46, 48–186, 186–557 and 557+ microlitres per square foot) and from measured full-coverage photo output of roughly 0.5–1.2 ml per A4. Sources at the end.
| Tier | What it looks like | Coverage | ml / m² | Plan at |
|---|---|---|---|---|
| ■ Mono CAD line | Plans, sections, elevations, shop drawings on bond | 2–5% | 0.2–0.5 | 0.35 |
| ■ Colour CAD / dense line | Layered MEP, hatching, revision clouds, coloured services | 5–15% | 0.5–2 | 1.2 |
| ■ Map / render | GIS maps, site plans with aerials, 3D visuals, presentation boards | 15–40% | 2–6 | 4.0 |
| ■ Poster / graphic | Retail posters, exhibition panels, full-colour signage | 40–80% | 6–12 | 9.0 |
| ■ Photo / fine art | Full-bleed photography on gloss, canvas, backlit film | 80–100%+ | 12–22 | 15.0 |
3. Paper size: the doubling ladder
The A-series is built so each size up is exactly double the last. That makes ink forecasting almost trivial — but it also means the jump from an A2 proof to an A0 final is a 4× jump in ink, not a small one.
| Job type | A4 | A3 | A2 | A1 | ARCH D | A0 |
|---|---|---|---|---|---|---|
| ■ Mono CAD line | 0.02 | 0.04 | 0.09 | 0.18 | 0.19 | 0.35 |
| ■ Colour CAD / dense line | 0.08 | 0.15 | 0.30 | 0.60 | 0.67 | 1.20 |
| ■ Map / site plan / render | 0.25 | 0.50 | 1.00 | 2.00 | 2.23 | 4.00 |
| ■ Poster / full-colour graphic | 0.56 | 1.13 | 2.25 | 4.50 | 5.01 | 9.00 |
| ■ Photo / fine art / backlit | 0.94 | 1.88 | 3.75 | 7.50 | 8.36 | 15.00 |
Calculated from each tier's mid-point ml/m² × the sheet area. Full-bleed assumed; a drawing with a wide title-block margin uses slightly less.
4. Paper type changes everything
The same file, printed at the same size, can use well over twice the ink depending on what it lands on. This is not a printer setting being wasteful — it is physics, and it is deliberate.
Uncoated bond has no receptive layer. Ink soaks into the fibres and spreads, so the driver caps the total ink it will lay down — push past that limit and the paper cockles and the lines go fuzzy. A gloss photo paper has a micro-porous coating engineered to hold two to three times as much ink without bleeding, which is exactly why the blacks look deep and the colours look saturated. More ink is the product you are paying for.
Unlike the other figures in this guide, these four multipliers are an estimate rather than a published specification — they reflect how much ink a media profile will let the printer lay down, which varies between machines, drivers and paper brands. Treat them as the shape of the effect, not exact numbers. Your own plotter logs ink use per job: print the same file on bond, on coated and on gloss, read the counters, and you will have this table for your own machine and media.
A tank is per colour — your prints are not. Why a mono CAD office replaces matte black five times before the first yellow is half empty, and what that does to an order.
Not sure which tier your work falls into? Send us your monthly plot count, your usual sheet size and what you print on, and we’ll work out your real square metres.
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Notes
Figures are built from published wide-format coverage thresholds. Channel splits, media multipliers and maintenance overhead are indicative planning figures, not manufacturer specifications — your own machine’s ink-usage log is always the better number.