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What total ink coverage means
Total ink coverage, often shortened to TIC, is the sum of the four CMYK percentages in one spot of a print file. If a dark shadow uses 60% cyan, 40% magenta, 30% yellow and 80% black, its total ink coverage is 210%. That number matters because a press and a paper can only hold so much ink. Pile on too much and the ink stays wet, pages stick together, colours shift, and drying time grows. Every print shop therefore sets an ink limit, and files that break it get fixed or rejected.
Why ink limits differ by paper
Coated paper has a sealed surface, so it can usually accept around 300% total ink. Uncoated paper soaks ink into its fibres, so its limit is lower, often near 240%. Newsprint is the most absorbent and fragile, and many printers cap it around 240% or less. Glossy stocks sit between coated and matte. The limit is not a law of nature; it is a practical line your printer draws from experience with their press, their inks and their drying setup. Always ask your printer for their number before you export a long run.
How to use this calculator
Enter the four CMYK percentages for the darkest area of your design, then pick the paper type. The tool adds the four values and compares the sum with the limit for that stock. A pass means the colour is within the safe range. An over-limit result tells you exactly how many points you must remove. The fix is usually to lower the black channel first, because black contributes the most to the total without changing the visible colour much. Rich black built from all four channels is the classic offender: a 100-100-100-100 black is 400% and fails every limit.
Rich black done right
Designers build rich black deliberately so large black areas look deep instead of grey. A common recipe is 60% cyan, 40% magenta, 40% yellow and 100% black, which totals 240% and passes most limits. For small text, pure 100% black alone is better: it prints sharper and avoids registration problems where four plates must line up perfectly. Use rich black for big fills and backgrounds, and plain black for body text and thin lines.
Where high coverage hides
Shadows in photographs are the usual hiding place. A photo converted to CMYK can carry 320% or more in its darkest corners without anyone noticing on screen, because screens show colour with light, not ink. Gradients that fade to black, dark product photos and night scenes deserve a check before print. Run the darkest sampled value through this calculator, not the average of the whole image, because the press fails at the worst spot, not at the average.
Fixing an over-limit file
Open the file in your design or prepress software and use its ink-limit or total-area-coverage setting during CMYK conversion. Most tools let you set a cap, and the conversion then redistributes the colour to respect it. If you fix by hand, reduce black first, then cyan, and re-check the visual result: heavy cuts can flatten shadows. A soft proof on the real paper stock is the final check, because numbers alone cannot show how a shadow will look once the ink dries.
Common mistakes
The most common mistake is checking only the colours you typed in, while photos and placed images carry their own CMYK values. Another is using one limit for every job: a file that passes on coated stock can fail on uncoated. A third is trusting the screen: monitors cannot show ink overload. Check the darkest values, use your printer’s limit, and keep rich black recipes inside it, and your files will pass preflight the first time.