Process costing is a cost accounting method that averages total production costs across large volumes of identical units. Manufacturers with continuous or repetitive production rely on it to determine the cost of a single unit. That includes bottling soda, refining crude oil, or mixing shampoo, where every input blends together on the line.
When you make thousands of near-identical goods, accurate per-unit costs drive pricing, margins, and planning. This guide covers what process costing is, how it compares to job costing, the main methods, and how to run it.
Key takeaways
- Process costing assigns production costs to large batches of identical units, so it fits manufacturers in food, chemicals, textiles, and similar industries.
- Cost per unit comes from dividing total production costs by the number of units, which spreads materials, labor, and overhead evenly.
- Equivalent units convert partly finished goods into finished-unit equivalents, so work in process gets a fair share of costs.
- Accurate unit costs sharpen pricing, expose waste, and support budgeting decisions across every production stage.
What is process costing?
Companies that produce large quantities of identical or very similar products use this method. Instead of tracking each item, process costing allocates total production costs, including direct materials, direct labor, and overhead, to all units once completed.
You can also use weighted averages to account for works-in-process (WIP). Dividing total production costs by the number of finished goods and WIPs gives the average cost of each unit. It fits highly standardized process manufacturing, like food, chemicals, or textiles.
Process costing rests on three key cost elements.
1. Direct materials
These are the physical materials used in production, such as fabric in a clothing factory or chemicals in a paint plant. In process costing, the raw materials inventory value is spread evenly across all units produced. In a batch of paint, for instance, every gallon shares the total cost of materials used.
2. Direct labor
This covers the wages paid to workers directly involved in manufacturing. Whether they are operating machines or assembling products by hand, the direct labor costs are spread evenly across all units.
3. Manufacturing overhead
This includes the indirect costs tied to production, like factory rent, machinery maintenance, and utility bills. These overhead costs accumulate and then get allocated to all units manufactured during the period. The result is a reliable per-unit calculation for both WIPs and finished goods.
What are some process costing examples?
Process costing is a costing method where products move through standardized production stages. A few examples show it in action.
1. Food production
Companies making bottled drinks or packaged snacks use process costing to spread production costs across thousands of identical products. This approach simplifies pricing and profitability analysis.
2. Textiles
Textile production runs through stages like spinning, dyeing, and finishing. Process costing assigns costs to each step, making it easier to track expenses and value large fabric batches.
3. Chemical manufacturing
Manufacturers of paints, cleaning supplies, or pharmaceuticals divide total production costs across each gallon, liter, or tablet produced.
4. Steel and cement industries
These industries produce huge quantities of standardized products, like sheets of metal or bags of cement. Process costing splits expenses like energy, labor, and materials into a clear cost per ton, supporting transparent pricing.
What is the difference between process costing and job costing?
Both process and job costing answer how much an item costs to produce. But unlike job costing, which tracks costs for custom or unique products, process costing spreads expenses evenly across all units. The major differences below can help you decide which fits your business.
Production style
- Process costing suits identical items made through a standardized process, like soda bottles or paper reams. It spreads total cost uniformly across all units.
- Job costing suits unique, custom items. Businesses use it to track specific jobs or batches, ideal for construction or custom furniture.
Tracking costs
- In process costing, you group costs by department, then average them across all units for the unit cost.
- In job costing, you assign materials, labor, and overhead to each job for a detailed breakdown.
Handling unfinished work
- Process costing values partially completed products using methods like the weighted average at each stage.
- Job costing covers individual projects, so you calculate costs only when the job is finished.
What are the types of process costing?
Businesses use different process costing methods to match production needs. The three most common are below.
1. Weighted average method
The weighted average method combines costs from current and previous production periods. It averages the total cost of direct materials, labor, and overhead over all units, whether completed or in process. This method is simple and works best for standardized processes with steady flow.
2. FIFO (first-in, first-out) method
The FIFO method assumes the earliest costs apply to the first units completed. It separates costs by period, focusing on the current period’s expenses. This gives a precise picture of production costs in a specific timeframe, which helps most when costs change.
3. Standard costing
Instead of tracking actual costs, standard costing uses predetermined estimates for materials, labor, and overhead. Businesses rely on it to spot variances between expected and actual costs, which improves efficiency and protects profitability.
What are the benefits of process costing?
Process costing does more than track expenses; it supports businesses that rely on standardized production. It helps in four main ways.
1. Simplifies cost allocation
Instead of calculating costs for individual items, process costing distributes them evenly across all units. This saves time and improves accuracy.
2. Improves cost control
Analyzing expenses at each production stage helps companies spot inefficiencies in materials, labor, or overhead and reduce waste.
3. Ensures accurate pricing
Precise unit cost data lets businesses price products to cover expenses and protect their margins.
4. Supports strategic decision-making
Detailed cost and output data aid budgeting, resource planning, and evaluating manufacturing productivity.
How do you use the process costing method?
Using the process costing method well lets businesses track production costs with clarity. Follow these steps to run it:
- Map out your production stages: Break your manufacturing process into stages or departments, then mark each step where products move and incur costs.
- Track costs as they happen: Monitor all costs involved, from direct materials and labor to overhead. These are the core elements of production expense.
- Calculate equivalent units: Measure how much work is done on partly completed units. Business LibreTexts defines equivalent units as physical units × percentage of completion.
- Allocate costs to each stage: After finding the total cost, assign it to each production stage based on the resources used in that phase.
- Determine cost per unit: Divide total production costs by the number of equivalent units, so cost per unit = total production costs ÷ equivalent units.
- Assign costs to finished goods and WIPs: Apply the unit cost to both completed products and any unfinished goods in the pipeline.
- Summarize and review: Summarize costs at each stage and compare them to budgets or past performance to gauge cost control and efficiency.
How Fishbowl supports process costing
Fishbowl’s inventory management software gives you the data to fine-tune production costs. With Fishbowl AI Insights, you can create custom reports that pinpoint inefficiencies, guide resource allocation, and improve your bottom line.
Fishbowl also connects directly with QuickBooks, plus Xero for teams that use it, syncing your accounting and inventory systems. Prince Michel Vineyard & Winery used Fishbowl to move its cost-to-manufacture calculation from six months after year-end to immediate. The winery also improved accuracy by more than 10% and saved about $25,000 a year by dropping an outside accounting firm.
Book a Demo today to see how Fishbowl can streamline your manufacturing.
Frequently asked questions about process costing
What is the formula for process costing?
Process costing relies on two core formulas. Equivalent units = number of physical units × percentage of completion, which converts partly finished goods into finished-unit equivalents. Then cost per unit = total production costs ÷ equivalent units, spreading materials, labor, and overhead across everything produced.
When should a company use process costing instead of job costing?
Use process costing when you make large volumes of near-identical units in continuous production, such as beverages, chemicals, or cement. Costs blend together, so averaging them across units is accurate and practical. Choose job costing for custom or unique work, like construction projects, where each job needs its own cost record.
What are the disadvantages of process costing?
Because process costing averages costs, it can hide differences between individual units or small batches, which may mislead pricing when products actually vary. Estimating equivalent units for work in process also takes judgment, and errors there distort unit costs. Fishbowl AI Insights helps close that visibility gap with custom dashboards and plain-language reports that surface cost differences without manual report requests.
How do equivalent units work in process costing?
Equivalent units restate partly finished goods as a smaller number of fully finished ones. If 1,000 units are 40% complete, that equals 400 equivalent units, calculated as physical units × percentage of completion. This assigns a fair share of materials, labor, and overhead to work in process, so ending inventory and finished goods are costed correctly.
Can process costing track labor costs on the production floor?
Yes. Process costing treats direct labor as one of three cost pools, then spreads it across the units produced in each stage. That yields an average labor cost per unit, and Fishbowl keeps production and labor data in one system so unit costs match the floor.
Related posts
Keep learning with these related resources:
- Costing Methods for Inventory and Manufacturing Management: Types & Examples
- Standard costing: Definition, how to calculate it and examples
- How to Calculate Labor Cost in Manufacturing: Complete Guide
- How to Calculate and Manage Manufacturing Overhead Costs
- Discrete Manufacturing: What It Is and How It Compares to Process Manufacturing
- Batch Manufacturing: Understanding the Process and Its Pros and Cons