Hair Colour Formula
Converter
Switching brands? Moving salon? ColourKey translates any hair colour formula between the 6 major professional brands — shade, developer, mixing ratio and timing — instantly and accurately.
Convert My Formula →7-day free trial · No credit card required
Convert Between Any of These Brands
What Gets Converted
Shade Equivalents
Finds the closest shade match in the target brand's range — same level, same tone family, same depth.
Developer Translation
Converts developer strength and brand-specific naming — Welloxon 6%, Shades EQ Solution, Dia Activateur — to the correct equivalent.
Mixing Ratios
Every brand mixes differently. Colorance is 2:1, Koleston is 1:1, Shades EQ is 1:1.5. ColourKey converts the ratio correctly every time.
Processing Time
Timing adjusted for the target product — a demi-permanent needs different timing than a permanent oxidative colour even at the same level.
Grey Coverage Notes
Flags if the converted product handles grey differently — important when moving from a grey-specialist to a standard permanent.
Save Against Client
Converted formulas save to client history so you never need to convert the same formula twice.
Common Formula Conversions
Formula Converter Questions
Is the conversion exact or approximate?
ColourKey finds the closest equivalent — same level, same tone family. Where an exact match doesn't exist, it recommends the nearest shade and notes any difference in coverage or result.
Does it convert the developer strength too?
Yes. Developer is converted both by strength (3%, 6%, 9%, 12%) and by brand-specific product name, so you always know exactly which bottle to reach for.
I'm moving from one salon to another with different stock. Will this work?
Yes — this is one of the most common use cases. Upload a photo of your client's existing result, ColourKey reads the current formula and converts it to whatever brand the new salon uses.
Does it handle boosters and corrective tones?
Yes. If the original formula includes a corrective booster (e.g. Wella /89 mix), ColourKey finds the equivalent in the target brand's range.
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