One number tells you faster whether your restaurant is making money than your entire set of accounts.
That number is your prime cost: the combined total of what you spend on goods (food and drink) and on people. Together they form the two largest — and crucially, the two most controllable — costs in any restaurant. While fixed costs such as rent and insurance are largely locked in, you shape your prime cost anew every day: with every purchase order, every portion, every shift you schedule. That is why prime cost is not an accounting footnote, but the most direct lever you have on your profitability.
For fine dining, this number carries extra weight. Premium ingredients, a skilled brigade and high-touch service all push costs up — while the widely quoted "60% rule" originates in casual dining and will lead you astray. This guide explains exactly what prime cost is, how to calculate it correctly, which benchmarks genuinely apply to fine dining, and which seven levers you have to lower it without compromising quality.
What exactly is prime cost?
Prime cost is the sum of two components, expressed as a percentage of revenue:
- Cost of goods sold (COGS): your food cost and your beverage cost — the actual cost of everything you sold during a given period.
- Total labour costs: all wages and salaries, plus employer social contributions and benefits — for both kitchen and front-of-house, permanent and flexible staff alike.
The formula is straightforward:
Prime cost % = (food cost + beverage cost + total labour costs) ÷ revenue (excl. VAT) × 100
What makes prime cost so powerful is that it brings together the only two large cost categories over which you have direct daily control. Research shows that prime cost typically represents 55% to 65% — and in fine dining often more — of total revenue. It is by far your largest controllable spending category: precisely where management decisions have the greatest impact. A reduction of just two percentage points on £1 million in revenue is £20,000 in extra profit flowing straight to your bottom line.
How prime cost is built up
Example of a fine dining restaurant — food cost + labour as % of revenue
Prime cost together: 68% of revenue
Why prime cost is the master KPI
Many restaurant owners manage by food cost alone. Understandable — it is the figure accountants and suppliers mention most often. But focusing solely on food cost misses half the picture and leads to a classic error: food cost and labour cost are interchangeable.
Consider this: you can make your fresh pasta, pastries and stocks entirely in-house. That lowers your food cost (you buy cheap raw materials) but raises your labour costs (you need more mise-en-place hours). Or you buy semi-finished and pre-prepared products: your food cost rises but you need fewer kitchen staff. An operator who manages only food cost can "improve" that number by deploying more labour — while the total does not fall, or even increases.
Prime cost solves this by measuring both together. It prevents you from optimising one at the expense of the other, and gives you the single number that reflects the true efficiency of your operation. That is why the best operators regard prime cost as their most important daily KPI — more important than food cost, more important even than revenue, because revenue without cost discipline is an illusion of success. If you want to go deeper on measuring yield per seat, also read our article on RevPASH: the KPI every restaurant owner must know — prime cost and RevPASH are the two sides of the same profitability coin.
Benchmarks: what is a good prime cost?
The general rule of thumb is: keep your prime cost below 60–65% of revenue. For casual dining and quick service that is a workable target. But here lies the biggest trap for fine dining.
The 60% rule is a casual-dining myth
The "60% rule" originated in high-volume, standardised restaurants — not in fine dining. For a gastronomic restaurant, a prime cost of 60% to 70% is entirely normal, and above 65% is common. Two structural reasons:
- Higher food cost (35–40%): premium ingredients — aged meat, fresh fish, truffle, lobster, à la minute preparations — simply cost more than bulk products. Achieving a food cost of 28% with such products would mean giving up quality.
- Higher labour costs: fine dining runs on a skilled brigade and a far higher staff-to-guest ratio. Sauciers, a sommelier, a maître d'hôtel, multiple cooks per course — that is labour-intensive and expensive.
The crucial nuance: a higher prime cost in fine dining is not a weakness but a deliberate choice, compensated by a higher average spend and strong beverage and wine margins. A UK fine dining restaurant with 68% prime cost and an average spend of £100 can be more profitable than a bistro with 58% prime cost and £30 average spend. What matters is not the percentage itself, but whether it is supported by your business model.
Indicative benchmarks by restaurant type
| Restaurant type | Food cost | Labour costs | Prime cost |
|---|---|---|---|
| Quick service | 28–32% | 25–30% | ~55–60% |
| Casual / bistro | 28–35% | 28–34% | ~58–65% |
| Fine dining | 35–40% | 30–35%+ | ~60–70%+ |
The UK reality: structurally higher labour costs
For UK restaurant operators the bar sits somewhat differently from the international benchmarks, which mostly originate in the United States. Employer National Insurance Contributions are charged at around 15% on earnings above the secondary threshold — and when you add in the relentless upward pressure from the National Living Wage (which rises every April) and the employer pension auto-enrolment minimum, the true payroll burden on each team member is considerably higher than the headline wage. That structurally pushes the labour side of your prime cost upward compared with lower-cost labour markets. Bear this in mind when comparing your figures with international guidelines: a UK fine dining operation running 33% labour costs is often performing better than that same percentage in a country with lower payroll burdens. Factor this reality into your restaurant budget so that your expectations align with the local cost structure.
Calculating prime cost: step by step
An accurate calculation depends on using actual costs, not just purchase invoices. Follow these steps, preferably weekly:
- Determine your actual cost of goods. Use the formula: opening inventory + purchases − closing inventory = goods consumed. Add kitchen (food) and bar (beverages) together. Looking only at invoices leads to errors because inventory fluctuations distort the picture.
- Add up your total labour costs. Including gross wages, employer social contributions, holiday pay, fringe benefits and the cost of flexible and casual staff. Do not forget the salary of working owners — that belongs here from a business economics perspective.
- Take your revenue excluding VAT from exactly the same period.
- Apply the formula: (cost of goods + labour costs) ÷ revenue × 100.
A worked example
Take a fine dining restaurant with a weekly revenue of £34,000 (excl. VAT):
- Food & beverage consumed: £12,920 → 38% food cost
- Total labour costs (incl. employer contributions): £10,200 → 30% labour costs
- Prime cost: (£12,920 + £10,200) ÷ £34,000 = 68%
After 68% prime cost, 32% remains for rent, energy, depreciation, marketing, insurance and profit. For fine dining that is workable, provided your fixed costs are under control. If prime cost drops to 64%, your profit margin can potentially double — which is why every percentage point counts. To find out at exactly which occupancy you cover your costs, combine this with a break-even analysis.
Weekly measurement: the habit that separates winners
Here lies perhaps the most important — and most underestimated — insight of this guide. Calculate your prime cost weekly, not monthly.
The difference is enormous. Whoever tracks their labour costs weekly can correct a runaway situation up to four times faster than someone who measures monthly. Measuring daily gives you thirty chances per month to course-correct — compared with just one if you review monthly. The problem with infrequent measurement is fundamental: by the time your monthly figures show that prime cost exceeded the benchmark, the month is over and nothing can be corrected. That profit is permanently lost.
A weekly prime cost report changes your role as an owner: from recording after the fact to steering before problems escalate. If in week two you see that labour costs are climbing because of a quiet Tuesday, you adjust your staff schedule for the following week. If food cost is creeping up due to waste, you intervene before the damage accumulates for a full month. Real-time insight into your occupancy and revenue per time slot — for example through HappyChef analytics — makes this weekly discipline achievable without losing your evenings in spreadsheets.
The 7 levers to lower your prime cost
Because prime cost has two components, you have two fronts to work on. The art is to gain ground on both sides without the guest noticing any reduction in quality.
On the goods side (food cost & beverage cost)
- Menu engineering. Analyse which dishes are both popular and profitable, and shape your menu accordingly. Shift the attention (and the sales) towards your "stars". Learn how in our guide to menu engineering.
- Portion and recipe control. Standardise portions and work with fixed recipes with exact gramme weights. A 10-gram deviation in butter per plate seems trivial, but across thousands of plates it adds up significantly.
- Reduce waste. Manage your inventory, apply FIFO, and use leftover products creatively. See our tips on controlling food costs.
- Sharper purchasing. Negotiate volume discounts and seasonal prices with your suppliers — our guide to supplier negotiation typically delivers 10–20% in savings.
On the labour side
- Smarter staff scheduling. Align your staffing to your actual peak hours rather than fixed shifts. One surplus team member per service quickly costs you thousands of pounds per year. Combine this with insight into your peak hours and busy periods.
- Higher revenue per hour worked. Do not increase workload — increase output: better upselling, smoother table turns and thoughtful reservation spacing let the same brigade generate more revenue.
- Reduce staff turnover. Every departing team member costs you recruitment, training and lost productivity. In fine dining, where experience is invaluable, turnover is a hidden prime cost killer. Learn how to reduce staff turnover in fine dining.
The secret lever: beverages and wine
There is an eighth lever that, strictly speaking, does not lower your prime cost by cutting costs but by improving your mix — and for fine dining this is the most powerful of all. Beverages, and wine in particular, typically carry a far lower cost-to-price ratio than food. By driving your wine and beverage revenue upward, you lower your blended prime cost without the guest giving up anything — on the contrary, a strong wine pairing enhances the experience.
In practice: a guest who adds a wine pairing at £50 on top of an £85 tasting menu shifts your revenue mix into the high-margin category. Your food cost percentage on that table falls accordingly. Invest therefore in a thoughtfully curated wine list and beverage programme and in a team that recommends wine pairings with genuine confidence. It is the rare lever that improves both your margin and your guest experience simultaneously.
How HappyChef supports your prime cost discipline
Managing prime cost comes down to two things: maximising your revenue side and keeping your cost side sharp. HappyChef helps primarily on the revenue and planning side, which directly affects your prime cost percentage.
With restaurant analytics you track your occupancy and revenue per service and per time slot in real time — the foundation for a staffing plan that keeps labour costs low without compromising service. Through guest profiles you know the preferences and spending patterns of your guests, enabling more targeted upselling and better timing of your high-margin offerings (wine, aperitif, dessert). And an efficient table plan increases your revenue per hour worked by making optimal use of your capacity. Service by service, you are working on both the denominator and the numerator of your prime cost ratio.
The ultimate guide The Ultimate Guide to Restaurant Finance Know your numbers, protect your cash flow and grow profitably. Open the guideConclusion: one number, daily discipline
Prime cost is not an abstract accounting concept but the most practical steering tool a restaurant owner has. It brings your two largest, most controllable costs together into a single figure that predicts profitability faster than any other number. For fine dining the message is clear: do not be misled by the 60% rule from casual dining — a prime cost of 65 to 70% is normal and healthy, as long as your higher average spend and strong beverage margins support it.
The restaurant owners who make structural profit do not do one thing spectacularly differently. They do one thing consistently: they know their prime cost, they measure it weekly, and they course-correct before a runaway cost erodes profit. Start this week. Calculate your prime cost, compare it against your target, and choose one of the seven levers to begin with. Build from there with the broader context in our ultimate guide to restaurant finance and protect your cash flow, so that profit on paper becomes profit in your account.