What Are Prime Costs? A Guide for Restaurant Owners

In the restaurant industry, profit is not just about how much you sell — it is about how much you keep after costs. Even a full dining room generates no real profit if food and labor costs consume most of the revenue. This is the core problem that prime cost management is designed to solve.

This guide covers how to calculate prime cost, why it directly affects profitability, and how smart strategies like using a restaurant order management system, reducing waste, optimizing your menu, and improving labor efficiency can help you build a more profitable restaurant.

Prime cost is the sum of a restaurant's two largest direct operating expenses: food costs and labor costs.

Food costs include ingredients, beverages, packaging, condiments, and waste. Labor costs include wages, salaries, benefits, and other employee-related expenses.

Together, they represent the most important indicators of a restaurant profit margin and operational efficiency.

Prime cost vs. Overhead cost: What’s the difference?

While prime costs include direct expenses, overhead costs refer to indirect expenses such as rent, utilities, marketing, and administrative costs.

It is still important to understand the difference between the two because prime cost alone is an incomplete picture of profitability. 

Prime cost is a helpful metric for monitoring production efficiency, but it shouldn’t be used alone, as it doesn't capture the full restaurant cost. It works best when combined with full cost analysis (including overhead) for pricing, budgeting, and profitability decisions.

Why restaurant prime costs matter

When ingredient and labor prices go up — as they have consistently for years — the instinctive response is to raise menu prices.

This can help protect profit, but it also comes with a risk. Higher prices may reduce customer demand or require more marketing just to maintain foot traffic, which can eat into your gains.

Since you cannot control inflation or supplier price increases, managing prime cost becomes even more important.

Instead of relying only on increasing sales or raising prices, many restaurant owners focus on controlling what they can to earn more from the same sales.

For example:

If your restaurant earns $100 per week and your prime cost is $80, you save $20.  If you reduce that cost to $75, you save $25.

Even small improvements can make a difference.

Prime cost gives you a practical way to stay profitable, even when external costs are rising. 

How to calculate prime cost?

Prime cost formula

Prime cost is just the sum of your food and labor costs.

Formula:

Prime Cost = Food Costs + Labor Costs

Example:

• Food costs = $5,000
• Labor costs = $4,000

Prime Cost = $9,000

Prime cost percentage formula

To better understand performance, prime cost is often expressed as a percentage of total sales. 

Formula:

Prime Cost % = (Prime Cost ÷ Total Sales) × 100

Example:

• Prime cost = $9,000
• Sales = $15,000

Calculation:

$9,000 ÷ $15,000 = 0.6

0.6 × 100 = 60%

Prime  cost percentage  =  60%

Restaurant prime cost benchmark

According to Ahlbeck & Cook, a CPA consulting firm, the following prime cost ranges indicate that a restaurant is financially healthy: 

The prime cost of a restaurant should ideally not exceed 70% because it ensures that there is still enough revenue left to cover overhead expenses, while leaving room for profit.

If the prime cost goes beyond this level, it can lead to profitability issues since most of the revenue is already consumed by food and labor costs.

On the other hand, a figure below the benchmark may indicate efficient operations. However, it’s important to know how to calculate food cost and labor costs accurately to ensure that cost-cutting efforts do not compromise food or service quality. 

5 strategies to maintain low prime cost

Controlling the prime cost of a restaurant requires financial literacy and operational discipline across purchasing, staffing, and service. These five strategies have the strongest measurable impact.

1. Use a restaurant ordering system.

An affordable restaurant ordering system promotes independent ordering, allowing restaurant owners to assign fewer staff to order-taking and focus more on customer service and food preparation. 

It also ensures accurate orders, helping reduce missed items, incorrect orders, and unnecessary food waste that can increase costs.

Additionally, it is packed with helpful features such as:

• Table management, for better seating and faster turnover 
• Kitchen display system replaces paper tickets and improves order communication 
• Marketing tools that help promote offers and increase customer engagement
• Basic accounting features that track sales, taxes, and expenses.

2. Source from local farmers

According to the Restaurant Inventory Management Guide, buying directly from farms or producers can eliminate distributor markups of around 20%–30% and generate potential savings of 5%–15% through better vendor negotiation and consolidation.

3. Repurpose extra ingredients 

The National Restaurant Association states that repurposing surplus food and unused ingredients is now an effective reduction strategy for food waste in restaurants. 

For example, vegetable trimmings can be used for stocks, day-old bread can be turned into croutons or breadcrumbs, and extra proteins can be incorporated into soups or special meals.

By practicing proper food waste management, restaurants can significantly reduce food cost losses, improve kitchen efficiency, and support more sustainable operations.

4. Cross-train employees

When staff are trained to handle multiple roles such as serving, basic kitchen prep, or cashier duties, restaurants can operate efficiently even with a smaller team. 

This reduces the need to hire additional staff during peak hours and minimizes downtime during slow periods, all of which contribute to better cost control, while maintaining smooth restaurant operations. 

5. Optimize your menu 

Menu optimization, also known as menu engineering, helps you focus on selling items that are both popular and profitable. Not all dishes contribute equally to your revenue, so it is important to identify which items are driving your profits and which are increasing your costs.

Start by analyzing your menu based on:

• Food cost per item
• Popularity or sales volume
• Profit margin

Once identified, you can:

• Highlight high-profit items on your menu design
• Adjust pricing for low-margin but popular items
• Remove or improve items that have high costs but low demand

For example, a dish that sells well but has a low profit margin can be improved by adjusting ingredients or portion size. Meanwhile, slow-moving items that are costly to produce may need to be removed or replaced.

Understanding what prime costs are is very important for every restaurant owner who wants to maintain profitability while keeping operations efficient. 

By closely monitoring your prime cost and comparing it with industry benchmarks, you can identify opportunities to reduce unnecessary expenses without affecting quality. 

When combined with smart strategies such as using restaurant order management systems, sourcing ingredients wisely, repurposing excess food, cross-training staff, and optimizing your menu, these practices help build a more efficient and sustainable restaurant.