1. Specification of stone

According to the common practice of stone curtain wall, the thickness is usually 18mm, 25mm and 30mm. Take these three cases as examples to illustrate the process of calculating the material price:

1.2 The price of raw materials is usually 6000 yuan / m³. Considering the cutting fee of 80 yuan / ㎡, the cost price is 6000 ÷ 38.46 = 156 yuan / ㎡, and 156 + 80 = 236 yuan / ㎡ after adding the cutting fee.

1.3 Due to different specifications and sizes of stone plates, there is a problem of cutting utilization rate, which is generally taken as 90%. Considering the influence of cutting loss, the cost price should be 236 ÷ 90% = 262 yuan / ㎡

1.4 Generally, stone manufacturers should consider profits ranging from 15% to 30%. If calculated by 15%, the manufacturer's quotation should be 262 ÷ 85% = 308 yuan.

1.5 The stone freight is 8 ~ 10 yuan / ㎡ for 18mm stone, 14 ~ 16 yuan / ㎡ for 25mm stone and 18 ~ 23 yuan / ㎡ for 30mm stone. One time loading and unloading is considered. The selection of high and low costs mainly depends on the distance between the project site and the processing site.

For example, the price of 25mm stone is: 1000 ÷ (25 + 8) = 30.30 ㎡; 6000 ÷ 30.30 = 198 yuan / ㎡; 198 + 80 = 278 yuan / ㎡; 278 ÷ 90% = 309 yuan / ㎡; 309 ÷ 85% = 363 yuan / ㎡, 363 + 14 = 377 yuan / ㎡ after considering freight.

For example, the price of 30mm stone is: 1000 ÷ (30 + 8) = 26.31 ㎡; 6000 ÷ 26.31 = 228 yuan / ㎡; 228 + 80 = 308 yuan / ㎡; 308 ÷ 90% = 342 yuan / ㎡; 342 ÷ 85% = 402 yuan / ㎡, 402 + 18 = 420 yuan / ㎡ after considering freight.

2. Cylindrical stone and special-shaped stone

In fact, the column is very general and has different shapes. There is no formula that can directly quote. Basically, the unit price = cost + profit = material cost + processing cost + gross profit

2.1 The material cost is easy to calculate, while the processing cost can not be accurately calculated due to the different modeling and fancy processing difficulties of stone columns, different materials and different equipment, processing capacity and expertise of various factories

2.2 It's not easy to calculate the price according to the regular stone material and the size of the cylinder. After all, it's not easy to determine the price according to the regular stone material and the size of the cylinder. After all, it's not easy to determine the price according to the regular stone material and the size of the cylinder. But according to the specific size, many of which will be used later.

2.3 So the direct method is that you have done processing and can only calculate it after a long time of experience accumulation. Generally, experienced masters will use empirical formula for calculation. For example: a company had some columns with great processing difficulty before, and the processing factory estimated a cost according to previous experience. The processing factory has made special-shaped and cylindrical columns for more than ten years. However, the actual production is more difficult than expected, and the cost has increased by 50% (said by the factory itself). However, due to the error of the factory's own calculation, the price has not changed according to the original price. Otherwise, if the company estimates it by itself, it will lose.

2.4 If you are a trading company, you'd better not make your own quotation for special-shaped stones such as stone columns, especially for special-shaped stones with great processing difficulty, or it's easy to make mistakes in estimation. It is better to quote based on the price of the factory, with a higher degree of security.