How to calculate direct engineering costs
In the field of engineering construction, direct engineering costs are an important part of project cost accounting. It is directly related to the budgeting, cost control and final settlement of the project. This article will introduce in detail the calculation method of direct engineering costs, and combine it with structured data to help readers better understand.
1. Definition of direct engineering costs
Direct engineering costs refer to the costs directly used for the construction of engineering entities, including labor costs, material costs, machinery usage fees, etc. It is the core part of the total project cost, usually accounting for 60%-70% of the total cost.
2. Composition of direct engineering costs
| Expense Category | illustrate | Calculation method |
|---|---|---|
| Labor cost | Wages of workers directly engaged in engineering construction | Labor unit price × project quantity |
| Material fee | Cost of raw materials and auxiliary materials constituting the engineering entity | Material unit price × material consumption |
| Machinery usage fee | Lease or depreciation expenses for construction machinery | Mechanical shift unit price × number of shifts used |
3. Calculation steps of direct engineering costs
1.Determine the quantity of work: Calculate the engineering quantities of each sub-project based on the construction drawings.
2.Apply quota: Select the corresponding quota according to the project characteristics and determine the consumption of labor, materials, and machinery.
| Project name | unit | man-day | Cement (kg) | Steel bar(t) |
|---|---|---|---|---|
| C30 concrete foundation | m³ | 1.2 | 320 | 0.05 |
| Brick masonry 240 wall | m³ | 1.8 | 200 | - |
3.Determine unit price: Determine the labor unit price, material unit price and mechanical shift unit price based on market prices.
| Resource type | unit | market price |
|---|---|---|
| Ordinary workers | working day | 150 yuan |
| P.O42.5 cement | ton | 450 yuan |
| excavator | Taiwan class | 800 yuan |
4.Calculate fees: Multiply the consumption of each item by the unit price, and summarize the direct engineering cost.
4. Calculation examples
Assuming that a project requires pouring 100m³ of C30 concrete foundation, calculate the direct engineering cost:
| Expense items | Calculation process | Amount (yuan) |
|---|---|---|
| Labor cost | 1.2 working days/m³×100m³×150 yuan/working day | 18,000 |
| Material cost (cement) | 320kg/m³×100m³×0.45 yuan/kg | 14,400 |
| Material fee (steel bar) | 0.05t/m³×100m³×4,000 yuan/t | 20,000 |
| total | - | 52,400 |
5. Things to note
1. Market prices fluctuate greatly, so unit price data should be updated regularly.
2. Quota standards may differ in different regions, and the quota in the project location should be used.
3. Pay attention to unit conversion during calculation to avoid calculation errors caused by inconsistent units.
4. Special construction techniques or materials may need to be calculated separately, and the quota cannot be simply applied.
Through the above methods and steps, the direct engineering costs in the engineering project can be accurately calculated. Reasonable cost calculation not only helps control project investment, but also provides important basis for subsequent bidding, construction management, etc.
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