What is a good backbar cost percentage for a salon?

Most healthy salons run total backbar at 8–12% of service revenue, with colour product specifically at 6–10% of colour service revenue. Above 15% total backbar, something structural is wrong — usually pricing that hasn't kept pace with product cost.

How much colour is wasted in a typical salon?

There's no reliable industry figure, because almost nobody measures it. In practice, over-mixing of 20–30 g per service is common where mixing isn't weighed. At Canadian wholesale pricing, that's roughly $4–5 per service, or $400–500 per month per full-time colour stylist.

Should backbar cost be built into the service price or charged separately?

Built in, for standard services. Charging separately for product on a listed service creates checkout friction and price confusion. Extended additions — a second tube on very long hair, a bond builder add-on — can reasonably be a named upcharge, because the client can see what they're paying for.

Does HST apply to backbar product purchases?

Yes, you pay HST on professional product purchased from your distributor, and as an HST registrant you claim it back as an input tax credit. For margin analysis, always use the pre-tax cost — using the HST-inclusive figure overstates your cost of goods by 13% in Ontario.

Salon economics

What Does Hair Colour Actually Cost You Per Service?

Colour cost per service is simple arithmetic — cost per gram of product multiplied by grams actually mixed. The interesting part is the half of the equation nobody measures.

August 10, 2026 · 7 min read

Most salons price colour services on instinct and find out at year-end whether it worked. It doesn't have to be a mystery. Colour cost per service is simple arithmetic: cost per gram of product, multiplied by grams actually mixed. For a typical Canadian single-process root retouch, that lands somewhere around $12 to $14 in product on a $95 service — roughly 13%. If your target is 8–10%, you already know where the problem is.

The number itself isn't the interesting part. What's interesting is that almost nobody measures the second half of the equation — grams actually mixed versus grams actually used — and that gap is where the money goes.

The math, step by step

Start with cost per gram. Take what you pay your distributor, not the retail price on the tube.

Item	Typical wholesale (CAD)	Unit cost
Permanent colour, 60 g tube	$11.00	$0.183 / g
Developer, 1 L	$24.00	$0.024 / mL
Lightener, 500 g tub	$55.00	$0.110 / g
Bond builder, 100 mL	$32.00	$0.320 / mL

Figures are illustrative. Substitute your own distributor pricing — line, brand, and volume tier all move these materially.

Now run a standard root retouch at a 1:1 mix ratio:

60 g colour     × $0.183 = $10.98
60 mL developer × $0.024 = $ 1.44
Total product cost        = $12.42

On a $95 service, that's 13.1%. Add a bond builder and you're at $17.54, or 18.5%.

A full head of foils with lightener runs differently:

120 g lightener  × $0.110 = $13.20
240 mL developer × $0.024 = $ 5.76
60 g toner + 120 mL dev   = $13.86
Total                     = $32.82

On a $250 service, that's 13.1% again.

Where the money actually leaks

The arithmetic above assumes you mix exactly what you use. Nobody does.

Over-mixing

Mixing 90 g “to be safe” on a 60 g application and rinsing the extra down the bowl costs $5.49 in that one service. It's invisible because it never appears on a report — the tube empties faster, and you assume you were busy.

Run it forward. A stylist doing six colour services a day, four days a week, over-mixing 25 g on average:

25 g × $0.183/g       = $4.58 per service
6 services × 4 days   = 24 services/week
24 × 4.3 weeks        ≈ 103 services/month
103 × $4.58           ≈ $472/month, per stylist

Across four colour stylists, that's roughly $22,600 a year going down the drain — literally.

Unlogged bowls

Corrective work, re-dos, and “just a quick toner” rarely get recorded against the ticket. These are real product draws with no revenue attached, and they distort every cost number you look at afterward.

Price drift

Distributor pricing changes. If your cost-per-gram assumptions are from eighteen months ago, every service price you've built on them is wrong. This is the quietest of the three and usually the largest in aggregate.

What percentage should you be at?

Colour cost as a share of colour service revenue is the metric that matters. Total backbar — colour, developer, shampoo, treatments, everything applied behind the chair — is a separate, wider number.

Metric	Healthy range	Investigate above
Colour product cost / colour service revenue	6–10%	12%
Total backbar / total service revenue	8–12%	15%

If you're above the threshold, the cause is almost always one of three things, in this order: over-mixing, service prices that haven't moved with product cost, or unrecorded product draws. Not, usually, the brand you buy.

How to measure it without adding admin work

You need two things: a scale, and a place for the number to land.

Weigh at the bowl. A $30 digital gram scale beside the colour bar. Stylists weigh what they mix. This alone typically surfaces the over-mix gap within a week.
Log the formula against the ticket. Not in a notebook — against the client record, so the same formula can be pulled up next visit and the cost can be attributed to real revenue.
Keep distributor pricing current. If your cost-per-gram is static, your margin is fiction. Pricing needs to flow from the distributor into the formula, not get typed in once and forgotten.
Review monthly, by stylist. Colour cost percentage per stylist, not salon-wide. The salon-wide number hides the outlier that's driving it.

Steps 1 and 2 are the hard part culturally and the easy part technically. Step 3 is the reverse.

This is the specific problem NeonO's Colour Studio was built for: formulas are logged in grams against the client record, and product cost is pulled from Metro Beauty Supply pricing rather than a number someone entered last year. The cost per bowl is calculated at the moment of service, and it's attributed to the ticket and the stylist. If you want the same discipline across the rest of the floor, the salon overview walks through it.

Common questions

What is a good backbar cost percentage for a salon?: Most healthy salons run total backbar at 8–12% of service revenue, with colour product specifically at 6–10% of colour service revenue. Above 15% total backbar, something structural is wrong — usually pricing that hasn't kept pace with product cost.
How much colour is wasted in a typical salon?: There's no reliable industry figure, because almost nobody measures it. In practice, over-mixing of 20–30 g per service is common where mixing isn't weighed. At Canadian wholesale pricing, that's roughly $4–5 per service, or $400–500 per month per full-time colour stylist.
Should backbar cost be built into the service price or charged separately?: Built in, for standard services. Charging separately for product on a listed service creates checkout friction and price confusion. Extended additions — a second tube on very long hair, a bond builder add-on — can reasonably be a named upcharge, because the client can see what they're paying for.
Does HST apply to backbar product purchases?: Yes, you pay HST on professional product purchased from your distributor, and as an HST registrant you claim it back as an input tax credit. For margin analysis, always use the pre-tax cost — using the HST-inclusive figure overstates your cost of goods by 13% in Ontario.

Run the numbers on your own salon

Pull your last three distributor invoices, divide by grams, and check the result against one week of actual services. If the gap between what you mixed and what you charged for surprises you, it's a measurement problem before it's a pricing problem.

See how Colour Studio tracks it →