Developer Volume Calculator
Match the developer volume to what you're actually trying to do — deposit, cover grey, or lift a specific number of levels.
Recommended developer
20 volume — standard gray coverage, lifts natural hair roughly 1-2 levels while depositing full color
Standard mapping: 10 volume deposits color with no lift, 20 volume covers grey and lifts about 1-2 levels, 30 volume lifts about 3 levels, and 40 volume is maximum lift — used sparingly and only when the product instructions call for it.
The standard volume mapping
Developer volume is measured in the amount of oxygen it releases, which is what drives lift. The widely-used convention is: 10 volume for deposit-only work with no lift, 20 volume for standard grey coverage and 1-2 levels of lift, 30 volume for about 3 levels of lift, and 40 volume for maximum lift, used sparingly.
Using more volume than a job requires doesn’t improve results — it just adds unnecessary processing stress to the hair and scalp.
Frequently Asked Questions
What's the difference between 10, 20, 30, and 40 volume developer?
Volume controls how much the developer opens the hair cuticle and lifts natural pigment. 10 volume deposits color with essentially no lift — good for toning or refreshing existing color. 20 volume is the standard strength for full grey coverage and lifts natural hair roughly 1-2 levels. 30 volume lifts about 3 levels. 40 volume gives maximum lift (4+ levels) and is reserved for high-lift formulas, used sparingly because of the added stress on hair.
Why does 20 volume cover grey specifically?
Grey hair has little to no natural pigment and a more resistant cuticle than pigmented hair. 20 volume opens the cuticle enough for permanent color's pigment molecules to deposit evenly on that resistant, non-pigmented hair — which is why it's the default strength most permanent grey-coverage formulas are built around.
Can I use a higher volume to make the color last longer?
No — volume controls lift, not longevity. Using a higher volume than the job calls for over-processes hair (more lift and more cuticle disruption than needed) without making the color last longer. Match the volume to the actual lift you need.
Is 40 volume safe to use at home?
40 volume is the strongest developer sold for at-home use and carries the highest risk of over-processing, breakage, and scalp irritation. It's meant for specific high-lift formulas and short, carefully timed applications — always follow the manufacturer's instructions and consider a professional for major lift.
Educational estimate — not professional cosmetology or medical advice. Patch-test first and follow your specific product’s instructions; consult a licensed colorist for significant lift or a complex color history.