10 vs 20 vs 30 vs 40 volume developer: what each one actually lifts
On natural hair, the rule of thumb is simple: 10 volume deposits with little to no lift, 20 volume lifts about 1-2 levels and covers gray, 30 volume lifts about 2-3 levels, and 40 volume lifts about 3-4 levels. Roughly four levels is the practical ceiling for permanent color plus developer. To go lighter than that, you pre-lighten. Everything below explains the chemistry behind those numbers so you can read a real head instead of memorizing a chart.
Rule of thumb on natural hair. Past about 4 levels you pre-lighten instead. Always follow the manufacturer's directions.
Permanent color is an oxidation reaction, not paint.
Understanding why the numbers move the way they do is what lets you adjust on the fly, instead of being surprised when the chart and the head disagree.
When you mix permanent color with developer, you are not coating the hair. You are starting a chemical reaction inside the strand. The developer is hydrogen peroxide in water, and its job is twofold. First, the alkalinity of the mixture swells the hair and opens the cuticle so the small dye precursors can get inside the cortex. Second, the peroxide oxidizes: it lightens the hair's own melanin (that is the lift) and at the same time triggers the colorless dye precursors to couple into the large color molecules that get trapped in the cortex (that is the deposit). Hydrogen peroxide is described in the chemistry literature as the most commonly used oxidizing agent in hair color, the agent that opens the cuticle and lightens melanin during the process (Comprehensive Review of Hair Dyes, NCBI / PMC).
So lift and deposit happen at the same time in the same bowl. The strength of the developer decides how much of the reaction goes toward lift. That strength is the only thing the volume number describes.
Volume vs percent
The number on the bottle is just peroxide concentration.
"Volume" is an old way of measuring how much oxygen a peroxide solution can release. The two systems map cleanly onto each other, and professional ranges sit between roughly 1.5% and 12% hydrogen peroxide in cosmetic developers (consistent with the CIR Safety Assessment of Hydrogen Peroxide in Cosmetics, and with Wella and Schwarzkopf professional developer education, which label their developers by both volume and percentage):
10 volume = 3% peroxide
20 volume = 6% peroxide
30 volume = 9% peroxide
40 volume = 12% peroxide
More peroxide means a more aggressive oxidation: more melanin lightened, more cuticle swelling, more lift. That is the whole reason the volumes ladder up. It is also why higher volumes are harder on the hair, because the same reaction that removes more pigment also stresses the strand more.
The rule-of-thumb ladder
What each volume does on natural hair.
These are starting points for healthy, natural, mid-porosity hair. They are how you make a first decision, not a guarantee. The next section is where the real head pulls them around.
10 volume (3%): deposit, little to no lift
There is just enough oxidation to develop the dye and let it deposit, but not enough to meaningfully lighten the natural pigment. Reach for it when you are going darker, depositing tone-on-tone, refreshing faded mid-lengths and ends, or toning. If you need the hair to get lighter at all, 10 volume is the wrong tool.
20 volume (6%): about 1-2 levels, and gray coverage
The everyday workhorse of permanent color. It lifts roughly one to two levels and provides the standard oxidation for full gray coverage, because resistant gray needs the cuticle opened and the dye fully developed to hold. Most permanent single-process color is mixed with 20 volume for exactly this reason: reliable deposit, modest lift, predictable tone.
30 volume (9%): about 2-3 levels
Step up to 30 when the target is two to three levels lighter than the starting level and 20 will not get there. You buy extra lift, but warmth comes up with it, because the underlying pigment exposed by lifting (red, then orange, then gold) is what you are uncovering as you go lighter. Plan your tone to neutralize what the lift will reveal.
40 volume (12%): about 3-4 levels, the maximum with color
The strongest standard developer, used with high-lift color for the biggest single-step jump permanent color can make on natural hair. It is also the harshest on the strand and the least forgiving on porous or compromised hair. Four levels is about as far as this approach goes cleanly. Push past it and you tend to get under-lift, brass, and unevenness instead of a clean blonde.
The ceiling: permanent color plus developer lifts roughly four levels on natural hair. To go lighter than that, the job changes. You pre-lighten with a dedicated lightener (bleach), which can remove far more pigment than peroxide alone, and then deposit your target shade as a second step. If your starting level is 4 and your target is a level 9 or 10, no single volume of developer mixed with color will get you there honestly. Recognizing that line is one of the most useful judgments a colorist makes.
Where the chart stops and the head starts
Three things move the real result.
The ladder above assumes natural, healthy, mid-porosity hair processed for the manufacturer's full time. Change any of those and the same volume behaves differently. This is the honest edge: the chart is the opening bid, not the answer.
What pulls the result lighter or faster
High porosity: damaged or previously lightened hair grabs and processes faster, so a lower volume often does more than the chart predicts, and can over-process
Fine hair: thinner strands lift more readily than coarse hair at the same volume
Longer processing time, within the manufacturer's window, lets the oxidation run further
Heat and sectioning that keeps the bowl warm and active
What holds the result back
Coarse, resistant, or virgin gray hair: a tight cuticle resists deposit and lift, so 20 volume and full processing time matter most
Dark, dense natural pigment: a level 2-3 base has far more melanin to lift than a level 6-7
Underlying warmth: lifting always exposes red and gold pigment, so "lighter" without the right tone reads as brassy, not the chart's clean level
Short or interrupted processing time, which stops the reaction early
None of this means the ladder is wrong. It means the ladder is a model, and the head in your chair is the reality. The skill is starting from the rule of thumb, reading the hair history and porosity in front of you, and adjusting volume, ratio, and timing from there. The result you get is only useful next time if you wrote down what you actually did.
Make it repeatable
The chart only helps if you record what you did.
A volume chart gets you to a confident first decision. What it cannot do is remember the dozen small adjustments that made a particular result land on a particular client: that you dropped to 20 volume because her ends were porous, that you ran it the full 35 minutes, that the 30 volume on her roots needed an extra neutralizing tone because the base lifted warmer than expected. Six weeks later, those details are gone, and you are re-guessing on a head you already solved once.
This is the entire reason to log the exact volume and color-to-developer ratio next to the client's starting and target level. The volume and the ratio are what drive how a formula lifts or deposits, so they are the two numbers most worth capturing. Color Formula is built to record exactly that: the developer volume, the ratio, the brand and shade you mixed, and the starting and target level, kept on your iPhone so the next time the same head sits down you reproduce the result instead of starting from scratch. It does not pick your volume for you and it does not promise a result. It remembers what worked so you do not have to. Coming soon to the App Store.
On natural hair, as a rule of thumb: 10 volume (3%) deposits with little to no lift, 20 volume (6%) lifts about 1-2 levels and is the standard for permanent color and gray coverage, 30 volume (9%) lifts about 2-3 levels, and 40 volume (12%) lifts about 3-4 levels. Permanent color plus developer tops out around four levels of lift on natural hair. To go lighter than that you pre-lighten with a dedicated lightener.
What volume developer covers gray hair?
20 volume (6%) is the usual choice for gray coverage with permanent color. It provides enough oxidation to open the cuticle and let pigment deposit and develop fully while lifting only about one level, which keeps the result close to the chosen shade. Higher volumes lift more and can leave coarse, resistant gray looking lighter or warmer than intended.
Can I lift more than four levels with developer alone?
Not reliably with permanent color on natural hair. Around four levels is the practical ceiling for color plus developer. Beyond that the result usually turns out warm, uneven, or under-lifted because there is more pigment to remove than the reaction can handle in one step. For bigger jumps you pre-lighten first, then deposit the target tone.
Does higher volume developer damage hair more?
Higher peroxide concentration means a more aggressive oxidation reaction and more cuticle swelling, so 40 volume is harsher on the hair than 10 or 20 volume. Use the lowest volume that achieves the level change you need, and account for porous or previously treated hair, which reacts faster and can over-process.
Why did the same formula give a different result on a different client?
The volume ladder describes natural, healthy, mid-porosity hair. Real heads vary in starting level, underlying warmth, porosity, hair history, and how long the color processes. Two clients with the same target can need different volumes or timing. This is why recording the exact volume and ratio you used, next to the starting and target level, is the only way to reproduce a result instead of re-guessing.
More from Color Formula
Keep the practice tight.
Color Formula records the developer volume and ratio of every formula next to the client's starting and target level, on-device, so a good bowl is repeatable. Coming soon to the App Store.