Hair Colour Amount By Length
Calculator
Results
- Colour cream needed (g)
- 60
- Developer needed (g)
- 90
- Total mix (g)
- 150
- Tubes of 60 g needed
- 1
Beauty and personal care results
| Colour cream needed (g) | 60 |
| Developer needed (g) | 90 |
| Total mix (g) | 150 |
| Tubes of 60 g needed | 1 |
formula-map diagram
- Colour cream needed (g)
- 60
- Developer needed (g)
- 90
- Total mix (g)
- 150
- Tubes of 60 g needed
- 1
Beauty and personal care relationship
Formula
colour = (length ÷ 10) × g per 10 cm × thickness factor= 60
Note
This is a simplified model: it applies the mixing ratio, dilution, application rate, growth rate or price you enter to plain arithmetic. Mixing figures use the ratio on your own product's label, because developer, powder and colour ratios differ from brand to brand. Dilutions use C1 x V1 = C2 x V2 and the standard conversion of 20 drops per millilitre; real droppers vary with the oil's viscosity and the dropper itself. Sunscreen amounts use the Du Bois body surface area formula with the application rate you enter, and the SPF figure uses the textbook approximation protection time = SPF x unprotected burn time, which is a simplification: sweat, water, towelling, UV index, altitude, reflection and your own skin all shorten it in practice. Hair, nail and hair-removal timings assume a constant linear growth rate, which varies by person, body area, age, season and health. Costs ignore taxes, sales and waste. Always patch test a new product on a small area first and follow the product label and any professional instructions. This is not dermatological, cosmetic or medical advice; see a dermatologist or a qualified professional for anything affecting your skin, scalp or health.
More in Beauty and personal care
See all →Frequently asked questions
How does hair length translate into the amount of colour needed?+
Longer and thicker hair has more surface area and mass to saturate, so the calculator scales the recommended colour and developer amount based on length category (and often density), using typical industry benchmarks such as roughly 30-40g of mixture for short hair up to 90g or more for long, thick hair.
Why does hair thickness or density matter as much as length?+
Two people with the same length can have very different amounts of actual hair mass; someone with fine, sparse hair needs less product than someone with the same length but thick, dense hair, so density is a meaningful adjustment on top of the base length estimate.
What happens if I mix too little colour for my hair length?+
Running out of product mid-application leads to uneven saturation and patchy, inconsistent color results, since sections that receive color later (or a second, freshly mixed batch) may process for a different amount of time than the first sections.
Is it better to overestimate the amount needed?+
A modest overestimate is generally safer than running short, since unused mixed color must be discarded anyway (oxidized product cannot be stored), but very large excess is simply wasted product and cost, so the calculator aims for a reasonable buffer rather than a large surplus.
Does this amount already include the developer, or just the color?+
This depends on how the specific calculator presents its result; check whether the output quantity is the color alone (to which you then apply your chosen developer ratio) or the total combined mixture, since applying a ratio a second time to an already-combined total will overestimate what you need.