# Hair Color Cost Per Service: What Each Formula Costs

Source: https://nextupwalkin.com/blog/hair-color-cost-per-service-backbar

> The tube you toss, the bowl you mix too big: how to work out colour cost per service, set a reorder point and see which services earn their keep.

Operations

# Hair color cost per service: what each formula really costs

Every colorist has mixed a little extra and poured it down the sink. Every owner has looked at a busy book and wondered why the account is still thin. The two are connected. Here is how to work out what a formula costs, where the grams go, and how to see which services are paying their way.

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[Blog](https://nextupwalkin.com/blog) [By Nicholas Chadwick](https://nextupwalkin.com/about)·November 5, 2026· 8 min read

## The short answer

A formula costs the grams of colour, developer and lightener in the bowl multiplied by what each gram cost you. Divide a tube’s price by the grams in it, multiply by what went in the bowl, add the developer, and you have the product cost of one service. Compare that with the price and you know how much of every sale the bowl uses.

Most salons do not do this, and the reason is understandable. The grams are written on a card or remembered, the prices are in a supplier’s invoice, and the stock is a shelf nobody counts until it is empty on a Saturday. The arithmetic is easy. Keeping the three records in step is the hard part.

## Why colour is the service that hides its cost

A haircut’s cost is mostly your time. Colour is different, because a real share of the price is a physical product that you buy in a tube, measure by eye and use up. A cut cannot run out. A colour can, and it can be mixed at 60 grams for one client and 90 for the next, with no one noticing until the end of the month.

That is why colour feels busy and thin at once. The chair is full, the till is full, and the supplier’s invoice quietly takes more than you expected. Nobody did anything wrong. A bowl that is 20 grams bigger than it needs to be, repeated across a week of clients, is a tube you did not plan to buy.

Cost matters beyond the bowl too. If you raise a price, you want to know whether the service earns enough to survive a quiet month. If a new brand is cheaper, you want to know whether it changes the number or just the label. You cannot answer either without a cost per service.

## Cost per gram: the arithmetic

Take a 60 gram tube that costs $12. A gram costs 20 cents. A 60 gram bowl of that colour is $12, and a 45 gram bowl is $9. The developer is cheaper per gram, so it is a smaller number, but it adds up across a day of clients.

Try your own tube and bottle prices below. Change the grams in the bowl and watch the product cost move, then change the service price to see how much of the sale is left once the bowl is paid for.

What one colour formula costs, and what is left

Enter what you pay for the tube and the developer, how much went in the bowl and what the service sells for. The chart shows how the cost grows with the bowl.

Colour tube price**$12**Grams in a tube**60 g**Colour in the bowl**60 g**Developer bottle price**$9**Developer in a bottle**950 ml**Developer in the bowl**90 ml**Service price**$135**

Product cost

$12.85

for this bowl

Colour cost per gram

$0.20

Left after product

90%

of the price

Product cost as the colour in the bowl grows Hover or tab to a column for the numbers.

Product cost as the colour in the bowl grows Product cost

30 g$6.4

50 g$10.7

70 g$15

90 g$19.3

110 g$23.6

130 g$27.9

150 g$32.1

Example arithmetic. Developer is scaled to the same ratio you entered. It leaves out labour, rent, foils, gloves and anything that is not in the bowl.

This is product cost only, so it is not profit. It shows how much of the price the bowl uses before anything else is paid.

## Where the grams actually go

Three places account for most of the difference between the formula on the card and the tube you reorder. The first is the bowl itself: mixing a little extra is a habit, because running short mid-application is worse than wasting a few grams. The second is leftovers, the colour that stays in the bowl or the brush at the end. The third is a formula that has quietly crept up over many visits, 50 grams one time, 55 the next.

None of these is a reason to blame anyone. They are the reason to measure. Once a formula has grams and products written down every visit, a bowl that grows shows up as a number rather than a feeling. The chart below shows the cost of one formula as the bowl grows, with an example of where the money goes inside a single service.

Where the product cost of one full colour goes
- Colour tube
- Toner
- Developer
- Lightener rinse

Hover or tab to a slice.

Where the product cost of one full colour goes Cost

Colour tube$12

Toner$3.5

Developer$0.9

Lightener rinse$0.6

Example numbers for a single service: a 60 g tube at $12, a toner at $3.50 and a bottle of developer. Your prices will differ.

## Backbar stock: count it, then set a reorder point

Backbar is the colour, developer and lightener behind the chair. It is also the stock that runs out at the wrong time. Counting it takes minutes, but only if the list already exists, so start with a list of every product, how much a pack holds, what a pack costs and how much is on the shelf.

A reorder point is the amount at which you buy more. Pick it as roughly the product you use in the time your supplier takes to deliver. A shop that uses 300 grams of a shade in a week and waits three days for an order should reorder before it drops under about 130 grams. Write the number down and the reorder is a list, not a surprise.

A backbar list with the cost of a gram worked out

Colour tube, level 660120.2120

Colour tube, level 860120.2180

Developer, 20 vol95090.01400

Developer, 30 vol95090.01400

Lightener powder450240.053200

Toner, neutral60140.2360

Example products and prices to show the arithmetic. Cost per gram or millilitre is the pack price divided by what the pack holds.

## What to do with the numbers

Once you can see cost by service, three decisions get easier. Price: a service whose product cost is a larger share of its price than the others may be underpriced, or may be using too much. Menu: a gloss that costs little and sells well is a good add-on to a colour. Habits: a bowl that creeps up is a conversation to have with a person, using a number rather than an opinion.

Keep one honest limit in mind. Product cost is not profit. Your time, your rent, your gloves, foils and towels are all outside the bowl. The number tells you what the product takes from the sale, which is the one part of the cost that you can change by measuring.

## How NextUp Walk-in handles it

Hair salons have a Formula Cost page. An owner or manager turns it on, because it is off until you do. You list your backbar products with what a pack costs and holds, stock on hand in grams or millilitres, and an optional reorder point. The page keeps a low-stock list so you see what is running out.

On a client’s colour record, the Products used lines say which products and how many grams went into the bowl, and a new colour starts from the last one’s products. When the record is saved, the grams come off stock once. If you edit the amount, stock moves by the difference. If you remove a line or the record, the grams go back, and stock never drops below zero.

The cost shows on the client’s record in the dashboard. The staff screen at the chair shows product names and what is left, and never a cost. A report shows cost and margin by service over a period you pick, from finished visits, using the main service’s price before discounts and tax.

It is cost accounting only. Nothing a client pays changes, and it is not a scale: the grams are what your team types. Details: [hair salons](https://nextupwalkin.com/industries/hair-salons?from=hair-color-cost-per-service-backbar), [products and stock](https://nextupwalkin.com/features/products-and-stock?from=hair-color-cost-per-service-backbar), [client profiles](https://nextupwalkin.com/features/client-profiles?from=hair-color-cost-per-service-backbar), [insights](https://nextupwalkin.com/features/insights?from=hair-color-cost-per-service-backbar), [pricing](https://nextupwalkin.com/pricing?from=hair-color-cost-per-service-backbar).

See it on your own line

[Start free, no card](https://nextupwalkin.com/signup?plan=free&from=hair-color-cost-per-service-backbar) [Start a 14-day trial, or pick Free at sign-up](https://nextupwalkin.com/signup?from=hair-color-cost-per-service-backbar)

Free needs no card: pick it at sign-up. The 14-day trial has every Pro feature, once per business. A card is needed to start, but nothing is charged until the trial ends, when the plan is charged unless you cancel first.

[Hair salonsClients check in at the door or from your Instagram link, see a wait that knows a color from a trim, and step out until their stylist is ready. Booked color, checkout, tips and suite rent sit in the same place.](https://nextupwalkin.com/industries/hair-salons?from=hair-color-cost-per-service-backbar) [Products and stockList the pomade, polish or shampoo you sell, with a price and the stock at each location. Add one to a visit’s bill and the stock comes off when the bill is paid.](https://nextupwalkin.com/features/products-and-stock?from=hair-color-cost-per-service-backbar) [Client profilesEvery client who checks in with a phone number gets a profile on their own. Look anyone up by phone number and see their visits, notes and preferences, so the next visit starts where the last one left off.](https://nextupwalkin.com/features/client-profiles?from=hair-color-cost-per-service-backbar)

## Know what the bowl costs before the invoice does

Example mockup: cost and margin by service from finished visits.

Count the grams once, then let the record keep count.

Start free, switch on Formula Cost, list your backbar and see cost and margin by service after your next week of colour.

[Start free, no card](https://nextupwalkin.com/signup?plan=free&from=hair-color-cost-per-service-backbar) [Start a 14-day trial, or pick Free at sign-up](https://nextupwalkin.com/signup?from=hair-color-cost-per-service-backbar)

Free needs no card: pick it at sign-up. The 14-day trial has every Pro feature, once per business. A card is needed to start, but nothing is charged until the trial ends, when the plan is charged unless you cancel first.

## Questions

### Does Formula Cost change what my clients pay?

No. It is cost accounting only. Nothing is added to a bill, tax, tip, commission or payout.

### Can my team see what the product costs?

No. At the chair the staff screen shows product names and what is left. The cost shows to owners and managers in the dashboard.

### Is it only for hair salons?

Yes, for now. Formula Cost needs a structured colour formula, and hair salons are the business type that has one.

### Does it weigh the colour for me?

No. The grams are what your team enters on the colour record. A scale is not part of it.

[Nicholas Chadwick](https://nextupwalkin.com/about)Founder, NextUp Walk-in

Founder of NextUp Walk-in and a software engineer with 20 years of building systems that have to work under pressure.

## Ready to try it?

NextUp Walk-in is a walk-in queue for barbershops, salons, restaurants, and service shops. Customers join from the phone they already have. No app required. The trial is 14 days, with every Pro feature.

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