Pantone to CMYK Converter

Converting Pantone to CMYK turns a single pre-mixed spot ink into a four-colour process build — Pantone 485 C, for example, comes out as C 0 M 81 Y 87 K 15.

Try “485-C”, “Reflex Blue”, “871-C”, “Black-C”, “Cool Gray 11-C”

Most-requested process builds — click for the C M Y K values

Search any of the 3,679 PMS colours above to get its cyan, magenta, yellow and black percentages.

Below the tool: a 100-colour PMS to CMYK ink chart with total area coverage and an ink-headroom flag, the 25 builds that lean hardest on the press, what rich black and the 300% ink limit actually mean for your file, how to convert in Illustrator and the InDesign Ink Manager, and when paying for a fifth plate is the cheaper decision.

Ink chart

Pantone to CMYK Conversion Chart — 100 Most-Used PMS Colors

A hundred PMS colours with their four-colour builds: the fourteen base inks the Pantone system mixes from, the deck blacks, the Cool Grays, four speciality colours and sixty-four numbered colours that recur in brand work. It is a hand-picked set, not a popularity ranking, grouped by ink family.

TAC is total area coverage — the four percentages added together. It is the number a prepress operator looks at first, because it decides whether the sheet will dry, and whether a rich black underneath will push the total past what the press allows. Across the whole coated deck the median build lands at 116% and the heaviest, PMS 2738 C, reaches 239%.

Ink headroom flags how hard the recipe leans on the chromatic inks. A build marked “None” drives cyan, magenta or yellow to 95% or more, which means the press has nothing left to give: if the printed sheet comes back short of the target, there is no ink adjustment that fixes it. 312 of the 1,565 coated colours fall into that category. This is a property of the recipe, computed exactly — it is not a measured press ΔE, and the methodology note explains why we do not publish one.

Pantone PMS to CMYK ink chart. Percentages are the process build this site's converter returns for each colour; TAC is their sum; ink headroom counts how many of cyan, magenta and yellow the build drives to 95% or more. Scroll sideways on a narrow screen; the colour name column stays in place.
Pantone colourC %M %Y %K %TACInk headroom
PMS Yellow C0131000113%None — 100% ink
PMS Yellow 012 C0161000116%None — 100% ink
PMS Orange 021 C0691000169%None — 100% ink
PMS Warm Red C073772152%Comfortable
PMS Red 032 C079736158%Comfortable
PMS Rubine Red C01005719176%None — 100% ink
PMS Rhodamine Red C01003212144%None — 100% ink
PMS Purple C078027105%Comfortable
PMS Violet C56100040196%None — 100% ink
PMS Blue 072 C9096038224%None — 96% ink
PMS Reflex Blue C10085046231%None — 100% ink
PMS Process Blue C10034021155%None — 100% ink
PMS Green C10002333156%None — 100% ink
PMS Black C091682107%Comfortable
PMS Black 2 C083580123%Comfortable
PMS Black 3 C1501585115%Comfortable
PMS Black 4 C0224181144%Comfortable
PMS Black 5 C0312676133%Comfortable
PMS Black 6 C5025087162%Comfortable
PMS Black 7 C07137696%Comfortable
PMS Neutral Black C3308692%Comfortable
PMS Cool Gray 1 C0011516%Comfortable
PMS Cool Gray 2 C0011819%Comfortable
PMS Cool Gray 3 C0012122%Comfortable
PMS Cool Gray 4 C1002627%Comfortable

Metallic and neon rows are marked. Four-colour process cannot reproduce either — see “Which Pantone colours cannot be reproduced in CMYK” below.

C vs U

Coated vs Uncoated CMYK Breakdowns

The C and U suffixes are not a labelling convention — they have two different approximate reference values, so they convert to two different builds. Pantone 186 C and Pantone 186 U are the same ink on two papers, and the uncoated printing is lighter and duller because the fibre drinks the vehicle and scatters the light. Ask any converter for “186” without a suffix and you are letting it choose for you.

Six well-known PMS numbers, showing the process build and total ink coverage for the coated printing alongside the difference between the coated and uncoated swatches.
PMS colourCoated buildTACC vs U difference
PMS 186 CC 0 M 92 Y 77 K 22191%ΔE 11.74 — uncoated prints lighter and much duller.
PMS 485 CC 0 M 81 Y 87 K 15183%ΔE 10.83 — uncoated prints lighter and much duller.
PMS Reflex Blue CC 100 M 85 Y 0 K 46231%ΔE 14.61 — uncoated prints lighter and much duller.
PMS 300 CC 100 M 49 Y 0 K 28177%ΔE 6.35 — uncoated prints lighter and much duller.
PMS 355 CC 100 M 0 Y 62 K 41203%ΔE 6.59 — uncoated prints about as light and much duller.
PMS Black CC 0 M 9 Y 16 K 82107%ΔE 17.32 — uncoated prints lighter and similarly saturated.

Why uncoated needs different ink percentages

The reason is dot gain. A halftone dot printed on uncoated stock spreads as the ink wicks into the fibres, so a 50% tint on the plate can measure 70% or more on the sheet. Coated stock holds the dot much closer to its intended size. That is why press profiles for uncoated work carry a different tone curve and a lower total ink limit — a build that was engineered against a coated profile prints darker, muddier and flatter on uncoated paper if nobody re-separates it.

Two practical consequences. First, convert the variant your brand sheet names rather than the bare number. Second, if the same brand colour is going onto both coated and uncoated stock in the same campaign, expect two different builds and say so in the guidelines — chasing one build across both papers is how colour arguments start. The coated vs uncoated guide covers the paper side in more depth, and the Pantone to HEX converter shows the same split on the screen side.

Gamut

Which Pantone Colors Cannot Be Reproduced in CMYK

Four-colour process describes a smaller set of colours than the Pantone library does. That is not a defect in anyone’s software; it is arithmetic. A spot colour is one pre-mixed pigment laid down as a solid film at full strength, and the ink maker can reach for whatever pigment the colour needs. A process build has four transparent inks and a halftone screen, and every colour it can produce lies inside the volume those four inks can mix. Anything outside that volume gets pulled to the nearest point on its surface.

The colours that never survive

  • Metallics. Pantone 871 C, 872 C, 877 C and the whole 8000 series work by suspending aluminium or bronze flake, which reflects light directionally so the colour shifts as the sheet moves. Process inks contain no metal. Pantone 877 C converts to C 3 M 1 Y 0 K 44 — a flat grey with no reflection in it at all.
  • Fluorescents. The 800-series neons re-emit ultraviolet as visible light, so they are literally brighter than the white paper around them. No combination of four subtractive inks can be brighter than the substrate.
  • The saturated corners. Orange 021, Red 032, Reflex Blue, Blue 072, the 265 and 266 violets and the 354 and 355 greens all sit outside or right on the edge of what process can reach. They do not disappear — they arrive duller and slightly shifted in hue, which is worse, because it looks like a printing mistake rather than an obvious limitation.

Ranking the difficult builds

The table below ranks the coated deck by ink headroom: how many of cyan, magenta and yellow the build drives to 95% or more, then by total ink coverage. It is exact arithmetic on the approximate CMYK build. A build with an ink at 100% is a build the press cannot push any further, so if the printed sheet comes back short of target, the only remaining lever is black — which darkens the colour rather than saturating it.

Deep blues dominate the top of this list, and that is genuinely informative rather than an artefact. Colours like Reflex Blue and the 2740s need cyan at 100%, heavy magenta and 45–60% black simultaneously: the recipe is asking for a chroma the inks cannot deliver, and the black is doing the work that saturation should. That is precisely why those colours print as flat, slightly grey navies in process and look electric as spot inks.

What this ranking is and is not
It measures the recipe, not a printed sheet. A true out-of-gamut figure needs a spectrophotometer reading of the spot ink and an ICC characterisation of the press condition — SWOP, GRACoL or FOGRA — and this site has neither. So we publish the arithmetic we can stand behind and say plainly that it is a screening tool for deciding which colours deserve a proof, not a substitute for one.
The 25 coated PMS colours whose process build leans hardest on the chromatic inks, ranked by how many of cyan, magenta and yellow the recipe drives to 95% or more, then by total ink coverage. These are the builds with nowhere left to go on press.
PMS colourSpot HEXProcess buildTACInks at 95%+
PMS 2738 C#06038DC 96 · M 98 · Y 0 · K 45239%2
PMS 2748 C#001871C 100 · M 79 · Y 0 · K 56235%1
PMS 662 C#001A70C 100 · M 77 · Y 0 · K 56233%1
PMS 2747 C#001A72C 100 · M 77 · Y 0 · K 55232%1
PMS 2758 C#001E62C 100 · M 69 · Y 0 · K 62231%1
PMS 2757 C#001E60C 100 · M 69 · Y 0 · K 62231%1
PMS Reflex Blue C#001489C 100 · M 85 · Y 0 · K 46231%1
PMS 281 C#00205BC 100 · M 65 · Y 0 · K 64229%1
PMS 280 C#012169C 99 · M 69 · Y 0 · K 59227%1
PMS Blue 072 C#10069FC 90 · M 96 · Y 0 · K 38224%1
PMS 655 C#002554C 100 · M 56 · Y 0 · K 67223%1
PMS 2745 C#280071C 65 · M 100 · Y 0 · K 56221%1
PMS 295 C#002855C 100 · M 53 · Y 0 · K 67220%1
PMS 6413 C#017F27C 99 · M 0 · Y 69 · K 50218%1
PMS Dark Blue C#00239CC 100 · M 78 · Y 0 · K 39217%1
PMS 288 C#002D72C 100 · M 61 · Y 0 · K 55216%1
PMS 648 C#002E5DC 100 · M 51 · Y 0 · K 64215%1
PMS 2965 C#00263EC 100 · M 39 · Y 0 · K 76215%1
PMS 294 C#002F6CC 100 · M 56 · Y 0 · K 58214%1
PMS 6406 C#016A2FC 99 · M 0 · Y 56 · K 58213%1
PMS 2735 C#2E008BC 67 · M 100 · Y 0 · K 45212%1
PMS 7463 C#002B49C 100 · M 41 · Y 0 · K 71212%1
PMS 287 C#003087C 100 · M 64 · Y 0 · K 47211%1
PMS 540 C#003057C 100 · M 45 · Y 0 · K 66211%1
PMS 539 C#00263AC 100 · M 34 · Y 0 · K 77211%1
From the dataset

How Much Ink a Pantone Build Actually Puts on the Sheet

Total area coverage decides whether a job dries, offsets or cracks at the fold, and it is the first number a prepress operator checks. This chart sorts every one of the 1,565 coated PMS builds into coverage bands.

Total ink coverage across the coated Pantone deckHorizontal bar chart of 1565 coated Pantone process builds grouped by total area coverage. Under 50 percent: 215. 50 to 100: 429. 100 to 150: 474, the largest group. 150 to 200: 394. 200 to 250: 53. 250 and over: 0.0250500PMS buildsUnder 50%215 (13.7%)50 – 100%429 (27.4%)100 – 150%474 (30.3%)150 – 200%394 (25.2%)200 – 250%53 (3.4%)250% and over0 (0%)
Total area coverage (C + M + Y + K) for all 1,565 coated Pantone builds. Computed from data/pantone.json by scripts/build-color-stats.mjs.

The takeaway: a single Pantone build is never the thing that breaks your ink limit. The median build is 116% and the mean is 112.97%. Only 53 builds — 3.4% of the deck — exceed 200%, and the heaviest in the whole coated library, PMS 2738 C, reaches 239%. Nothing here comes close to the ~300% limit of commercial sheetfed work.

What breaks the limit is stacking. Drop a 239% build on top of a 240% rich black, or knock one colour out of another with a trap, and the total on that spot is what the press has to dry. The number to watch is not the swatch in your palette — it is the heaviest square millimetre of the finished artwork, which is what a preflight ink-coverage check reports.

From the dataset

Ink Build Comparison — Eight Colours Side by Side

Two builds can carry the same total coverage and behave completely differently on press, because what matters is which inks are doing the work. These eight bars show the composition rather than the total.

Four-colour ink composition of eight Pantone coloursPMS Yellow C: cyan 0, magenta 13, yellow 100, black 0, total 113 percent. PMS Orange 021 C: cyan 0, magenta 69, yellow 100, black 0, total 169 percent. PMS 186 C: cyan 0, magenta 92, yellow 77, black 22, total 191 percent. PMS 485 C: cyan 0, magenta 81, yellow 87, black 15, total 183 percent. PMS 355 C: cyan 100, magenta 0, yellow 62, black 41, total 203 percent. PMS Reflex Blue C: cyan 100, magenta 85, yellow 0, black 46, total 231 percent. PMS 266 C: cyan 38, magenta 69, yellow 0, black 26, total 133 percent. PMS Black C: cyan 0, magenta 9, yellow 16, black 82, total 107 percent.CyanMagentaYellowBlack050100150200250Total ink coverage (%)Yellow C113%Orange 021 C169%186 C191%485 C183%355 C203%Reflex Blue C231%266 C133%Black C107%
Cyan, magenta, yellow and black percentages for eight well-known Pantone colours, stacked to a shared 250% scale, with total area coverage printed at the end of each bar.

The takeaway: the heavy builds are heavy because of black, not because of colour. Pantone Yellow C is a 113% build made almost entirely of one ink — clean, cheap and easy to hold on press. Pantone Reflex Blue C runs to 231% with cyan at 100%, magenta at 85% and black at 46%. That black is not adding depth, it is compensating: the chromatic inks have run out and the recipe is darkening the colour to get it close.

Compare Pantone 186 C at 191% and Pantone 485 C at 183% — two similar reds with different balances. 186 leans on magenta (92% against 81%), 485 on yellow, which is exactly why 186 reads as the cooler, more crimson red and 485 as the warmer, more orange one. And Pantone Black C is only 107%: a warm black built from 82% K plus a little magenta and yellow, which is why it never matches a flat 100% K.

Press reality

Rich Black, Total Ink Limit and Press Reality

A solid area of 100% K alone looks disappointing — washed out, slightly mottled, obviously thinner than the black you had in mind. The fix is a rich black: 100% K with one or more chromatic inks printed underneath to deepen it. A common commercial recipe is 60C 40M 40Y 100K, which totals 240% coverage. A cooler variant drops the yellow; a warmer one leads with magenta.

The constraint is the total ink limit, the maximum coverage the press and stock will carry before the sheet stops behaving. Roughly: commercial sheetfed offset on coated stock sits around 300%, heatset web around 300%, uncoated work lower still, and coldset newsprint as low as 240%. Exceed it and you get set-off — wet ink transferring onto the back of the next sheet — along with slow drying, cracking at the fold and plugged shadows where detail should be.

Those limits are baked into the standard profiles rather than being universal truths. U.S. Web Coated (SWOP) v2 targets American web offset. GRACoL 2006 and its successors target American sheetfed on premium coated stock, with a heavier ink limit and a different grey balance. Coated FOGRA39 and FOGRA51 target the European ISO 12647-2 condition, FOGRA51 assuming paper with optical brighteners. The same Pantone number converted against each of those produces a different build. This is why the useful question to a printer is never “what is the CMYK”, it is “which profile should I convert against”.

Two rules that prevent most reprints

  • Never set small text in rich black. Four plates cannot stay in perfect register at speed, and 9pt type built from four inks arrives fringed with cyan or magenta. Body copy is 100% K, always. Save the rich black for areas large enough that a fraction of a millimetre of misregistration is invisible.
  • Check the artwork, not the swatch. Individual Pantone builds are modest — the heaviest in the coated deck is 239% — but they stack. Run an ink-coverage preflight on the finished file and look at the worst spot, which is usually where a heavy colour overlaps a rich-black panel.

And on Process Black specifically: the K ink on a four-colour press is Process Black, so specifying it means 100% K by definition. Pantone Black C is a different ink entirely — a warm spot black whose build, C 0 M 9 Y 16 K 82, carries magenta and yellow precisely because it is not the process ink. The two are not interchangeable, and the Pantone black comparison page shows all seven deck blacks together.

Step by step

How to Convert Pantone to CMYK in Illustrator and InDesign

The converter above gives you the numbers. Inside a real document you usually want the application to do the conversion, so that every object using the colour changes together and nothing is left behind on a stray spot plate.

Converting Pantone swatches to CMYK in Illustrator

Illustrator will convert one swatch, a selection, or the whole document, and the three routes behave differently enough to matter.

  1. To convert one swatch permanently: double-click it in the Swatches panel, change Color Type from Spot Color to Process Color, set Color Mode to CMYK, and click OK. Everything using that swatch updates.
  2. To convert a selection only: select the objects, then choose Edit, then Edit Colors, then Convert to CMYK. This rewrites the fills in place and leaves the spot swatch in the panel.
  3. To convert everything at output: choose Window, then Output, then Separations Preview, tick Overprint Preview, and check which plates are still listed. Any spot plate you did not intend shows up here.
  4. Load the right book before you start. Choose Window, then Swatch Libraries, then Color Books, then PANTONE+ Solid Coated for a C number or PANTONE+ Solid Uncoated for a U number — Illustrator derives the process build from whichever book the swatch came from.
  5. Set the document CMYK profile deliberately under Edit, then Assign Profile. A build converted against U.S. Web Coated (SWOP) is not the same build as one converted against Coated FOGRA39.

Converting Pantone to CMYK in InDesign with the Ink Manager

InDesign has the better tool for this, because the Ink Manager converts at export without touching your swatches — so the file stays correct if the job goes back to spot.

  1. Open Window, then Output, then Ink Manager. Every ink the document will separate onto its own plate is listed here, including spot inks arriving inside placed EPS and PDF artwork.
  2. Tick “All Spots to Process” at the bottom of the dialog. The spot plates disappear from the list and the colours will output as process builds.
  3. Leave the swatches themselves alone. Because the change lives in the Ink Manager rather than in the swatch definitions, you can untick it later and the spot colours come back intact.
  4. Use the alias column instead when two spot swatches are really the same ink — for example a supplied logo carrying “PANTONE 186 C” and your own “Brand Red”. Aliasing them merges the plates and saves a plate charge.
  5. Check the result in Window, then Output, then Separations Preview before you export, and again in the exported PDF, since placed artwork can reintroduce a spot plate.
Always finish in Separations Preview
Whichever route you take, the last check is the same: open Separations Preview and confirm the plate list shows only Cyan, Magenta, Yellow and Black. A single forgotten spot colour inside a placed logo is the most common cause of an unexpected fifth-plate charge, and it is invisible in the layout view.
Decision

Spot vs Process — When to Pay for the Extra Plate

A fifth plate costs money: an extra plate, an extra unit on the press or an extra pass, extra make-ready, extra wash-up. Whether it is worth it is a real decision with a real answer, and it is not “always use spot for brand colours”.

Pay for the plate when

  • The colour covers a large area — a cover, a bag, a pack face. A process build that is slightly off is obvious across a big flat, and invisible in a small logo.
  • The colour is the brand and customers recognise it from across a shop. Some reds and some blues are load-bearing in a way that a 6% hue shift genuinely damages.
  • Our chart flags the build as having no ink headroom. Those are the colours a press operator cannot chase, so a proof that comes back short cannot be corrected on the day.
  • The job is short-run and simple — a two-colour letterhead runs cheaper as two spot plates than as four process plates, not more expensive.
  • The substrate is unusual. Uncoated, kraft and coloured stock all pull process builds around far more than they pull a solid spot ink.

Take the process build when

  • The artwork already needs full-colour photography. The four plates are on the press regardless, so the brand colour rides along free.
  • The colour appears small — a footer logo, a spine, an icon. Nobody compares a stamp-sized mark against a swatch book.
  • The colour is comfortably inside process reach. Most mid-tone corporate blues, greens and neutrals convert with a shift nobody notices.
  • The run is digital. Most digital presses are CMYK-only and cannot take a spot plate at all, though some offer extended gamut with orange, green and violet units.

The middle route worth knowing about is extended-gamut printing — CMYK plus orange, green and violet, run as a fixed seven-colour set. It reaches a large share of the Pantone library without a job-specific spot plate, which makes it attractive for packaging runs carrying many brands at once. Ask your printer whether they run it before you assume the choice is binary.

Frequently Asked Questions

The converter on this page returns C 0 M 81 Y 87 K 15 for Pantone 485 C, a total ink coverage of 183%. That is a starting build, not a guaranteed match: 485 is one of the reds that four-colour process struggles to hold, and a press proof will read duller than the spot ink. If the red is load-bearing for the brand, run it as a fifth spot plate.
Pantone Black C converts to C 0 M 9 Y 16 K 82 — note the magenta and yellow. Black C is a warm black, not a neutral one, so a build of 100% K alone prints noticeably cooler and flatter than the spot ink. The magenta and yellow are what carry the warmth, and the 82% K rather than 100% is what keeps it from going dead.
Search the PMS number in the tool at the top of this page and the four ink percentages appear immediately. Inside Adobe software, change the swatch from Spot Color to Process Color in Illustrator, or tick “All Spots to Process” in the InDesign Ink Manager. Whichever route you take, tell your printer which CMYK profile the build was made against, because the same PMS number produces different percentages under SWOP, GRACoL and FOGRA.
Because a spot ink is one pre-mixed pigment laid down as a solid film, and a process build is a halftone pattern of up to four transparent inks that your eye mixes. The four process inks describe a smaller range of colours than the spot ink library does, so any spot colour outside that range gets pulled to the nearest reachable one. Saturated oranges, blues, greens and violets shift the most.
Pantone 871 C is the standard metallic gold, and this converter returns C 0 M 11 Y 41 K 48 for it. That build reproduces the flat olive-brown a gold ink looks like when you photograph it, and none of the metallic reflection, because process inks contain no metal flake. If the job needs gold, it needs either a metallic spot plate or a foil.
Ask the printer first. If the job runs four-colour process, converting yourself lets you see and approve the shift rather than discovering it on a proof. If the job runs spot, or spot plus process, converting destroys the specification and costs you the accuracy you were paying for. Never convert a file without knowing which of the two you are printing.
This converter returns C 100 M 85 Y 0 K 46 for Pantone Reflex Blue C, which is a total ink coverage of 231% — one of the heaviest in the deck. Cyan is at 100%, so the build has no headroom left; anything the recipe still needs has to come from black, which is why the process version reads darker and greyer than the spot ink.
No. The C and U variants of a PMS number have different approximate reference values, so they produce different builds. Beyond that, uncoated stock absorbs more ink and gains more dot, so a press running uncoated is normally profiled with a lower total ink limit and different tone curves — the same numbers behave differently on the sheet.
TAC is simply C plus M plus Y plus K for a given build. It matters because ink has to dry: too much of it on one spot and the sheet offsets onto the next one, refuses to dry between passes, or cracks at the fold. Commercial sheetfed work is usually limited to about 300%, coldset web newsprint to around 240%. The builds in the chart on this page top out at 239%, so they leave room for the extra black a rich-black background adds underneath.
Process Black is the K ink itself — the black already on the press for four-colour work — so as a specification it means 100% K by definition. Pantone Black C is a different thing: a separate warm spot black from the solid deck with its own pigment, which is why it converts to a build that includes magenta and yellow rather than to plain K.
The metallics and the fluorescents, without qualification: process inks contain no metal flake and do not fluoresce, so nothing four-colour does can imitate them. Beyond those, the saturated inks lose the most — Orange 021, Red 032, Reflex Blue, Blue 072, the 265 and 266 violets and the 354 and 355 greens all read visibly duller as process builds. These are candidates for a fifth plate rather than a conversion.
It comes down to how much of the sheet the colour occupies and how well the audience knows it. A logo the size of a stamp on a leaflet is fine as a process build. A colour that fills a whole cover, or one customers recognise from a distance, is worth the plate. So is any colour our chart flags as having no ink headroom, because those are the ones a press cannot chase.
A rich black is 100% K with cyan, magenta or yellow underneath it, used because 100% K alone looks washed-out over a large area. A common recipe is 60C 40M 40Y 100K, giving 240% coverage. Use it for large solid areas and never for small text, where the plates cannot stay in register and the type ends up fringed with colour.
No, and no honest converter can claim otherwise without an ICC characterisation of a specific press condition. The builds here are computed from each colour’s approximate sRGB screen value by the standard non-colour-managed formula, which is what makes them reproducible and a reasonable starting point. Treat them as a first build to proof and correct, not as a final press-ready specification.
Methodology

Where These Numbers Come From — and What They Are Not

Every percentage on this page is read from this site’s Pantone dataset, which holds 3,679 colours across the coated, uncoated, metallic, pastel-and-neon, Colour of the Year and skin-tone libraries. Derived figures — total area coverage, the ink-headroom counts, the two charts — are computed at build time by scripts/build-color-stats.mjs and written to a JSON file this page imports, so anyone can re-run the script and get the same numbers. No value is entered by hand and no row appears for a colour the dataset does not contain.

Colour differences quoted anywhere on this page use CIEDE2000 as formulated by Sharma, Wu and Dalal (2005) with kL = kC = kH = 1, on Lab values converted from sRGB through CIE XYZ under the D65 illuminant and the 2° standard observer. Total area coverage is simply C + M + Y + K. Ink headroom is the count of cyan, magenta and yellow at 95% or above.

The limitation, stated plainly
The CMYK builds in this dataset are computed from each colour’s approximate sRGB screen value by the standard non-colour-managed formula. They are not spectrophotometer readings of printed ink, and they are not the output of an ICC conversion against a named press condition. That is why this page ranks difficult colours by ink headroom rather than publishing a press ΔE it cannot substantiate — a real gamut figure needs measured Lab for the spot ink and a characterisation of the press, and neither is in this dataset. Use these builds as a starting point to proof and correct, and ask your printer which profile to convert against for the actual job.

Ink builds and coverage figures on this page were last recomputed from the dataset on ; this converter has been online since .