Quick answer Choose developer by how far you're moving from your starting level: 10 volume to deposit, match or darken, 20 for gray coverage or one to two levels of lift, and 30 for about three levels. Leave 40 volume to salons and always confirm with your brand's lift chart.
Every permanent hair color kit and every tub of lightener depends on one bottle most people grab without a second thought: the developer. Its volume, 10, 20, 30 or 40, decides how much lift you get, how well gray takes the color and how much stress your hair takes along the way.
Go too low and the shade sits dark or skips your grays. Go too high and you get brassy, over-lightened, fragile hair that no gloss can hide.
The good news is that the choice follows a simple logic once you know your starting level and your goal. This guide explains what each volume does and how to match it to deposit-only color, gray coverage or real lift. It also covers the safety checks that stop an at-home color job from turning into a salon correction.
Time 15 minutes to choose, plus a 48-hour patch testDifficulty BeginnerSteps 8
Developer Volume by Coloring Goal
| Your goal | Developer | At home? |
|---|---|---|
| Deposit, match or go darker | 10 volume | Yes |
| Cover more than 30% gray | 20 volume | Yes |
| 1-2 levels lighter | 20 volume | Yes |
| About 3 levels lighter | 30 volume | With care |
| More than 3 levels lighter | Rounds of 20 or 30 | In stages |
| Big lift in one session | 40 volume | Salon only |
What You’ll Need
As an Amazon Associate, HairAide earns from qualifying purchases. Product links in this guide are affiliate links: they cost you nothing extra and help keep these tutorials free.
- Permanent hair color kit with matched developer The shade and the right-strength developer come pre-paired, so the volume and ratio already match your color.
- Custom-blended color kit The formula is matched to your starting shade and gray level and comes with its own developer, which takes the guesswork out of gray coverage.
- 20 volume creme developer The go-to strength for gray coverage and one to two levels of lift when you buy professional color separately.
- Digital scale and plastic mixing bowl set with tint brush Weighing color and developer keeps the ratio exact, so the lift and coverage come out predictable.
- Disposable nitrile gloves They protect your skin from developer and dye during mixing and application.
Step-by-Step
Step 1 Understand what the volume number means
Developer is a stabilized hydrogen peroxide cream, and the volume tells you its strength: 10 volume is about 3% peroxide, 20 is 6%, 30 is 9% and 40 is 12%.
When you mix it with permanent color or lightener, the peroxide breaks down your natural pigment and lets the dye develop inside the hair. A higher volume lifts more pigment, which is exactly why it also does more damage to the hair’s structure.
Semi-permanent color uses no developer at all, so this choice only applies to permanent color, demi-permanent color and lightener. Treat the number as a measure of how far you want to move, not a way to make color ‘take better’, and every choice after this gets easier.
Step 2 Find your starting level and target
Hair color is measured on a 1-10 scale, from 1 (black) to 10 (lightest blonde), and the gap between where you are and where you want to be decides the volume. In daylight, compare your roots and mid-lengths with the level swatches on the box or the brand’s website, then count the levels to your target shade.
Note whether the hair is virgin or already dyed, because permanent color cannot lighten earlier dye whatever developer you use. Only natural, undyed hair lifts. If your lengths carry old color and you want to go lighter, you need a color remover or lightener instead, so plan for that before you buy anything.
Step 3 Match the volume to your goal
Once you know the gap, your goal picks the developer. Use 10 volume when you’re depositing color, matching your natural shade or going darker, because you need little or no lift and want the gentlest option. Choose 20 volume for gray coverage and for one to two levels of lift, 30 volume for about three levels, and treat 40 as a tool for professionals only.
Clairol’s Premium Creme chart for natural levels 4-10 gives one level of lift with 10 volume, two with 20, three with 30 and four with 40. Each step up in strength buys roughly one more level, along with more stress on the hair.
Step 4 Give stubborn gray enough strength
Gray hair has no pigment of its own and is often resistant, so a formula that’s too gentle can leave it looking translucent rather than covered. Clairol advises at least 20 volume when more than 30% of your hair is gray, and 10 volume when you’re matching or deepening your color.
To estimate your percentage, part your hair in several places and look at the roots in daylight. If you can’t tell whether you’re above or below 30%, use 20 volume with a permanent shade made for gray coverage, which gives the dye enough strength to develop fully in pigment-free strands.
Step 5 Follow your brand’s chart and ratio
Lift charts are not universal. The same 20 volume can give a slightly different result in two brands because each color line is formulated differently. Before you mix, read the chart on the box insert or the brand’s website and use the volume and ratio it gives for your goal.
Ratios vary a lot: some lines mix 1:1, others 1:1.5 or 1:2, and guessing throws off both the lift and the coverage. Measure with a scale or a marked bowl rather than eyeballing it, and use the developer made for that color line so the two work together as they were designed to.
Step 6 Lift in gentle rounds, not one jump
If you need more than about three levels, don’t reach for 40 volume to get there in one session. Good Dye Young calls 40 volume the strongest developer and doesn’t recommend it at home. It advises several rounds with a lower-volume developer over one big lift, even on dark hair.
Dark hair shows red, then orange, then yellow undertones as it lightens. Lifting in stages lets you see where you’ve landed and tone in between, instead of overshooting into fragile, uneven hair. Give your hair time between sessions, and never use 40 volume on relaxed or permed hair, which Clairol specifically advises against.
Step 7 Patch test and strand test first
Do a skin allergy patch test 48 hours before every coloring session, following the instructions in the box, even if you’ve used the brand before. Then strand test the exact formula on a hidden section underneath: the same color, the same developer volume and the same ratio, timed as the label says.
The strand shows you the real lift, the undertone you’ll land on and whether the hair still feels strong afterward. If it lands short of your target, adjust within the brand’s chart rather than jumping to a stronger volume. If the strand feels gummy, overly stretchy or snaps easily, stop and book a colorist.
Step 8 Mix fresh and work safely
Wear gloves, open a window or run a fan, and mix only what you need right before you apply it, in a plastic or glass bowl rather than a metal one. Never pair one brand’s developer with another brand’s color, because the formula and ratio are designed as a set.
Use the mixture straight away and throw out any leftovers: once mixed, it keeps reacting and won’t give the same result later, and most box instructions say to discard it. Afterward, write down your shade, volume, ratio and timing so your next touch-up starts from a result you already know.
Common Mistakes to Avoid
- Reaching for 40 volume to go lighter faster at home. It’s the strongest developer, meant for professionals, and it should never touch relaxed or permed hair.
- Expecting a stronger developer to lighten previously dyed lengths. Permanent color can’t lift old dye, so you only lighten the roots and end up with banding.
- Using 10 volume when more than 30% of your hair is gray, then finding the grays look see-through instead of covered.
- Pairing one brand’s developer with another brand’s color, or eyeballing the ratio instead of measuring it.
- Saving leftover mixed color in a capped bottle for next month’s touch-up.
- Skipping the 48-hour patch test because you’ve used the brand before.
Pro tip On a root touch-up, apply the developer mix to the new growth only and refresh your lengths with a gentler deposit-only gloss. Dragging a lifting formula through already-colored ends every few weeks is how they become overprocessed.
The Bottom Line
Choosing a developer comes down to three questions: how far you’re moving from your starting level, how much gray you’re covering and what your brand’s chart says.
Use 10 volume to deposit, match or go darker, 20 for gray and modest lift, and 30 only for about three levels. Leave 40 to the salon. Check your choice again at every session, because grown-out color or more gray can change the answer.
See a colorist instead if you’re going more than three levels lighter on dark or previously colored hair, if your hair is relaxed or permed, or if a strand test comes out stretchy or gummy. A professional can lift in controlled stages and tone between them, which protects the condition you’ve worked to keep.
Frequently Asked Questions
What volume developer should I use to cover gray hair?
Use at least 20 volume if more than about 30% of your hair is gray, which is Clairol's guidance for stubborn gray. If you're only matching your current shade or going darker, Clairol recommends 10 volume. Pair the developer with a permanent shade made for gray coverage and follow that brand's mixing ratio exactly.
Can I use 40 volume developer at home?
It's best not to. 40 volume is the strongest developer, and Good Dye Young does not recommend it for at-home use. Clairol also advises against it on relaxed or permed hair. If you need a big lift, several sessions with 20 or 30 volume give you more control and less damage than one aggressive round.
What's the difference between 20 and 30 volume developer?
20 volume is about 6% hydrogen peroxide and 30 volume is about 9%. On Clairol's Premium Creme chart for natural levels 4-10, 20 volume gives about two levels of lift and 30 gives about three. Choose 30 only when you genuinely need that third level, because the extra strength means more stress on the hair and more warm undertone showing through.
Can I mix developer and hair dye from different brands?
It isn't recommended. Each color line is formulated with its own developer and a set ratio, such as 1:1 or 1:2, so swapping brands can change the lift, the tone and how well grays are covered. Use the developer the brand specifies, measure the ratio, and throw away any mixed color you don't use right away.
Will a higher volume developer lighten hair that's already dyed?
No. Permanent color can't lift dye that's already in your hair, whatever the developer strength. A higher volume will only lighten your natural regrowth and can leave you with light roots and darker ends. To lighten old color you need a color remover or lightener, and a strand test first shows how your hair will react.
Keep Reading
Sources
- 20 volume premium creme developer sallybeauty.com
- What volume of developer is best gooddyeyoung.com
