Gray Coverage Formulas: Percentages, Naturals and Developer

Gray coverage comes down to three calls: how much gray the client has, how much natural base the formula carries, and which developer lets that pigment develop inside the hair. Each brand draws its own lines for those calls, so the same 60% gray head gets a different formula in Majirel than in IGORA Royal.

Estimate the gray percentage by zone

Gray is rarely even. A client can be 80% white at the temples and 30% at the crown, so one number for the whole head leads to a formula that is right in one place and wrong everywhere else.

1. Part the dry hair at the front hairline, both temples, the crown and the nape.
2. In each part, look at a section about a finger wide and count how many strands out of ten are white.
3. Round each zone to a bracket: under 25%, 25 to 50%, 50 to 75% or 75 to 100%.
4. Formulate for the heaviest zone, which is usually the hairline and temples.

Write the percentage down by zone on the client card. When the spread is wide, a coverage formula on the heavy zones and a softer one elsewhere is normal.

The bracket matters because brands change their formulas at different points. Majirel switches at 50%. iNOA and Illumina Color switch at 70%. Koleston Perfect changes at 30% and again at 50%. An estimate of 45% that is really 60% puts you on the wrong side of the line. Read the client's natural level on the pigmented hair, not the white, using the same method as in our student guide to hair color levels.

Why naturals and gold naturals go into coverage formulas

White hair has no pigment left to give depth or warmth. A fashion shade is built to shift tone on hair that already has pigment underneath it. On white hair that tone sits alone, so the result reads too light, too see-through or off tone.

A natural shade carries a balanced mix of the primaries at its level. That balance supplies the depth white hair is missing, which is why natural series cover best and why every brand below adds a natural for heavier gray.

Gold naturals do the same job for warm results. White hair has no warm underlying pigment for a formula to build on, so a neutral or cool base alone can look flat or slightly ashy on gray. Gold at the same level puts that warmth back. L'Oréal Professionnel writes this choice directly into its rules: warm targets pair with a Gold shade, cool targets pair with a Natural.

Every rule below adds the natural or gold at the same level as the target. The depth stays the same and only the coverage changes.

How three brands publish their coverage rules

The coverage number on a chart is a ceiling. The mixing rule is how you reach it.

L'Oréal Professionnel: Majirel and iNOA

L'Oréal Professionnel gives Majirel up to 100% coverage. Under 50% white, use the client's desired shade on its own. Over 50%, mix half a tube of the desired shade with half a tube of the Gold (.3/G) shade at the same level for a warm target, or the Natural (N) shade at the same level for a cool target. Majirel mixes 1:1.5 with Majicrème Developer, and 20 vol is the coverage of white strength, with up to 2 levels of lift, for 35 minutes.

So a 7.43/7CG target over 60% white becomes half 7.43/7CG and half 7.3/7G. A cool 7.1/7B target pairs with 7/7N.

Majirel Cool Cover works off the client's natural level. At natural level 3 to 5, the target shade alone covers up to 100%. At level 6 and above, the target alone gives natural-looking coverage, and half target plus half natural on the same level gives opaque coverage, such as 6.1/6B with 6/6N.

iNOA sets its line at 70%. Up to 70% white, the target shade alone works with 10, 20 or 30 vol iNOA Oil Developer, mixed 1:1, for 35 minutes. From 70 to 100%, mix half target with half Gold Natural at the same level for warm results or half Natural for cool ones. For a deeper or more opaque result, the second half is the Extra Coverage Natural at the same level.

Wella Professionals: Koleston Perfect and Illumina Color

The Wella Professionals usage guidelines for Koleston Perfect say a Pure Natural shade is required for sufficient grey coverage. For 30 to 50% grey, a third of the color is a Pure Natural. For 50 to 100%, half is. Wella's own examples use 15 g 7/0 plus 45 g 7/75 with 60 g of 6% for 30 to 50%, and 30 g 7/0 plus 30 g 7/75 with 60 g of 6% for 50 to 100%. For resistant grey, the natural is an Intense Natural such as 66/0.

Illumina Color covers up to 70% with any shade. From 70 to 100%, the shade mixes 1:1 with its matching natural and goes on with 6%, so 7/81 pairs with 7/.

Schwarzkopf Professional: IGORA Royal

On Schwarzkopf Professional IGORA Royal, Naturals cover up to 100% through level 9 and fashion shades up to 70% on their own. From 70 to 100%, mix 2 parts fashion to 1 part natural, and 1:1 on resistant hair. A 6-46 target on heavy gray becomes 2 parts 6-46 to 1 part 6-0. Shades mix 1:1 with IGORA Royal Oil Developer, with 6% for 1 to 2 levels of lift and white coverage, for 30 to 45 minutes. Natural Extra shades such as 6-00 take 9%, or 6% on hair that is 90% white or more.

Coverage rules side by side

Resistant gray

Resistant gray is coarse, glassy white hair with a tight cuticle. It shows up as wiry, shiny strands, most often at the temples and front hairline. Color that covered the rest of the head looks translucent there, or fades from those strands first.

The brand rules handle it the same few ways:

• More natural in the formula. IGORA Royal moves from 2:1 to 1:1 fashion to natural on resistant hair.
• A deeper natural. Koleston Perfect calls for an Intense Natural such as 66/0. iNOA uses its Extra Coverage Natural for more opaque results.
• Resistant areas first. Wella's guidelines say to apply first where the grey percentage is highest, so those zones get the full processing time.
• Full timing. Majirel and iNOA process 35 minutes and IGORA Royal 30 to 45. Cutting the time short leaves resistant strands translucent.

Keep the coverage formula on the regrowth. iNOA says to mix a fresh batch of the target shade alone, with no Natural, Gold Natural or Extra Coverage Natural, for the mid-lengths and ends. A natural-heavy formula pulled through the lengths at every visit builds depth and dulls the tone.

Developer choice for coverage

For permanent coverage, 20 vol (6%) is the standard across all three brands. L'Oréal Professionnel labels 20 vol Majicrème and 20 vol iNOA Oil Developer as coverage of white, Wella lists 6% Welloxon Perfect for 1 level of lift and coverage of grey, and Schwarzkopf lists 6% for 1 to 2 levels of lift and white coverage.

Higher volume trades deposit for lift. Majirel lists 30 vol for up to 3 levels as maximum lift, not coverage, and IGORA Royal keeps 12% for Highlifts and Fashion Lights only. More lift on the pigmented hair means more exposed warmth, while the white hair still needs the full deposit, so the result looks uneven.

Lower volume works only where the brand allows it. iNOA lets 10 vol carry the target shade up to 70% white. Above 70%, the half-and-half natural formula takes over, and 20 vol is the strength iNOA labels for coverage of white. For the full breakdown of volumes and lift, see developer volume explained.

Demi-permanent lines blend gray, permanents cover it

Demi-permanent ratings top out lower. L'Oréal Professionnel rates Dia Color up to 70% gray coverage. IGORA Vibrance blends up to 50% white hair, and up to 70% with the Natural Extra shades on regrowth. Schwarzkopf says to move to IGORA Royal above 70%. Wella's Color Touch blends up to 50%. When a client wants the gray gone rather than softened, the formula belongs in a permanent line.

Some shades do not cover at all: Majirel High-Lift, Koleston Perfect 12/ Special Blonde, and IGORA Royal Highlifts, Boosters and Fashion Lights. Our guide on how to read a hair color chart shows where coverage ratings and those groups sit. Formula Finder builds gray coverage formulas from real shade codes in your brand, starting from the client's inspo pic.