How to Calculate a Selling Price

There is no single correct price for a product or a service. There is only a price that covers what the work costs you, leaves enough behind to keep the business running, and still makes sense to the person paying it. Many small businesses settle that number by copying a competitor or adding a familiar percentage to cost, then discover a year later that the percentage was never enough.

The two methods below give you a defensible starting point. They answer slightly different questions, which is exactly why they produce different prices from the same cost base.

Start with the cost of one unit

Before any pricing method makes sense, you need a cost per unit that includes everything the sale consumes.

Direct costs are the obvious ones: materials, components, packaging, delivery, and the hours of work that go into the job. Indirect costs also belong in the calculation — software subscriptions, insurance, rent, and the unpaid time spent quoting and invoicing — even though they are harder to attach to a single sale.

A simple approach is to add up your annual overheads, divide by the number of units or jobs you expect to deliver in the year, and add that share to the direct cost of each one. If you complete 400 jobs a year and carry 24,000 of overheads, every job carries 60 of overhead before any material is bought.

A price built on a cost figure that ignores overheads will look profitable on paper and feel like a loss in the bank account.

Cost-plus pricing: adding a markup

Cost-plus is the method most people reach for. You take the unit cost and add a percentage.

Cost 150 with a 40 per cent markup: price = 150 + (150 × 0.40) = 210.

The profit is 60, and the markup is 40 per cent of cost. But 60 out of a 210 selling price is only 28.6 per cent of the price. That gap between markup on cost and margin on price is the most common source of confusion in small business pricing.

Target-margin pricing: working back from profit

Target-margin pricing starts from the share of the sale you want to keep, rather than the share you add on top.

The formula is: price = cost / (1 - target margin).

With a cost of 150 and a target margin of 40 per cent: 150 / (1 - 0.40) = 150 / 0.60 = 250.

At 250 the profit is 100, and 100 is 40 per cent of 250. That is the figure the business actually wanted. The same 40 per cent input gives 210 under markup and 250 under margin — an 18 per cent difference in price and a 67 per cent difference in profit.

Why the methods disagree, and how to test a price

Markup and margin measure from different starting points. Markup compares profit with cost; margin compares profit with price. Because price is always larger than cost, the same percentage means less when it is applied to price.

If your target is stated as a margin — which is how most owners think about profitability, and how lenders and buyers usually read it — then cost-plus will systematically undershoot unless you convert the number first.

The conversion is straightforward. A 40 per cent margin is equivalent to a 66.7 per cent markup, because 0.40 / 0.60 = 0.667. Going the other way, a 40 per cent markup is a 28.6 per cent margin. Getting this backwards is expensive at scale: on 1,000 units, that 40-point gap between 210 and 250 is 40,000 of revenue.

Testing the price before you commit

A calculated price is a starting point, not a verdict. Three checks are worth running before it goes on a quotation.

• Does it survive a discount? If a 10 per cent reduction wipes out most of the profit, the price has no room to negotiate.
• Does it cover the cost of winning the work? Sales commission, payment processing fees and the unpaid hours spent quoting all reduce the net figure.
• Is it credible in your market? A price far above the going rate needs a reason the buyer can see; a price far below it invites questions about quality and leaves money on the table.

Common mistakes

• Treating markup and margin as interchangeable. They are not, and the error usually shows up as a shortfall at the end of the year rather than an obvious loss on a single job.
• Leaving overheads out of unit cost. Direct costs alone produce a price that covers materials and labour but not the business around them.
• Applying a margin to a cost that already includes one. Stacking percentages produces a price that is hard to explain and easy to discount by accident.
• Setting the price once. Costs move; a price built on last year's material costs quietly shrinks your profit every month.
• Rounding down to a tidy number. Rounding 250 to 245 costs 5 per unit and looks like nothing; across 800 units it is 4,000.

Which method to use

Use target-margin pricing when you know the profit share you need, which is most of the time for service businesses and for any product with a clear cost per unit. Use cost-plus when the market sets the price and you are checking whether you can afford to compete at it.

Either way, run the number through a markup calculator to see the markup your price implies, and a profit margin calculator to see the margin it actually delivers. Checking both figures on the same price takes a minute and prevents the most common pricing error in small business.