Some commonly used formulas for calculating the weight of metal materials:

**Round steel weight (kg)**=0.00617×diameter×diameter×length

**Square steel weight (kg)**=0.00785×side width×side width×length

**Hexagonal steel weight (kg)**=0.0068×width across opposite sides×width across opposite sides×length

**Octagonal steel weight (kg)**=0.0065×width across opposite sides×width across opposite sides×length

**Rebar weight (kg)**=0.00617×calculated diameter×calculated diameter×length

**Angle steel weight (kg)**=0.00785×(side width+side width-side thickness)×side thickness×length

**Flat steel weight (kg)**=0.00785×thickness×side width×length

**Steel pipe weight (kg)**=0.02466×wall thickness×(outer diameter-wall thickness)×length

**Steel plate weight (kg)**=7.85×thickness×area

**Garden copper rod weight (kg)**=0.00698×diameter×diameter×length

**Round brass rod weight (kg)**=0.00668×diameter×diameter×length

**Round aluminum rod weight (kg)** = 0.0022 × diameter × diameter × length

**Square copper rod weight (kg)**=0.0089×side width×side width×length

**Square brass bar weight (kg)**=0.0085×side width×side width×length

**Square aluminum bar weight (kg)**=0.0028×side width×side width×length

**Hexagonal copper rod weight (kg)** = 0.0077 × opposite side width × opposite side width × length

**Hexagonal brass bar weight (kg)** = 0.00736 × side width × opposite side width × length

**Weight of hexagonal aluminum bar (kg)**=0.00242×width across opposite sides×width across opposite sides×length

**Copper plate weight (kg)**=0.0089×thickness×width×length

**Brass plate weight (kg)**=0.0085×thickness×width×length

**Aluminum plate weight (kg)**=0.00171×thickness×width×length

**Garden copper pipe weight (kg)**=0.028×wall thickness×(outer diameter-wall thickness)×length

**Round brass tube weight (kg)**=0.0267×wall thickness×(outer diameter-wall thickness)×length

**Round aluminum tube weight (kg)** = 0.00879 × wall thickness × (outer diameter-wall thickness) × length

Note: In the formula, the unit of length is meter, the unit of area is square meter, and the remaining units are millimeters. The above weight * material unit price is the material cost, plus surface treatment + labor cost of each process + packaging material + shipping cost + Tax + interest rate = quotation (FOB).

**The proportion of commonly used materials**

Iron=7.85 Aluminum=2.7 Copper=8.95 Stainless Steel=7.93

Simple calculation formula for stainless steel weight

Calculation formula of weight per square meter of stainless steel plate (kg): specific gravity * thickness (mm) * width (mm) * length (m)

304, 321 pipe weight per meter (kg) calculation formula: 0.02491 * wall thickness (mm) * (outer diameter-wall thickness) (mm)

316L, 310S pipe weight per meter (kg) calculation formula: 0.02495 * wall thickness (mm) * (outer diameter-wall thickness) (mm)

Calculation formula for weight per meter (kg) of stainless steel: diameter (mm)*diameter (mm)* (nickel stainless: 0.00623; chromium stainless: 0.00609)

Calculation of theoretical steel weight

The unit of measurement for calculating the theoretical weight of steel is kilogram (kg). The basic formula is:

W (weight, kg) = F (cross-sectional area mm2) × L (length, m) × ρ (density, g/cm3) × 1/1000

The calculation formula for the theoretical weight of various steels is as follows:

**Round steel wire rod (kg/m)**

W = 0.006165 ×d×d

d = diameter mm

For round steel with a diameter of 100 mm, find the weight per m. Weight per m = 0.006165 ×1002=61.65kg

**Rebar (kg/m)**

W = 0.00617 ×d×d

d = section diameter mm

For rebar with a cross-section diameter of 12 mm, find the weight per m. Weight per m=0.00617 ×12 2=0.89kg

**Square steel (kg/m)**

W = 0.00785 ×a ×a

a = side width mm

For square steel with a side width of 20 mm, find the weight per m. Weight per m = 0.00785 ×202=3.14kg

**Flat steel (kg/m)**

W = 0.00785 ×b ×d

b = side width mm

d = thickness mm

For flat steel with a side width of 40 mm and a thickness of 5 mm, find the weight per m. Weight per m = 0.00785 ×40 ×5 = 1.57kg

**Hexagonal steel (kg/m)**

W = 0.006798 ×s×s

s = distance between opposite sides mm

For hexagonal steel with a distance of 50 mm from opposite sides, find the weight per m. Weight per m = 0.006798 ×502=17kg

**Octagonal steel (kg/m)**

W = 0.0065 ×s ×s

s = distance between opposite sides mm

Octagonal steel with a distance of 80 mm from opposite sides, find the weight per m. Weight per m = 0.0065 ×802=41.62kg

**Equilateral angle steel (kg/m)**

W = 0.00785 ×[d (2b – d) + 0.215 (R2 – 2r 2 )]

b = side width

d = side thickness

R = inner arc radius

r = radius of end arc

Find the weight per m of 20 mm × 4mm equilateral angle steel. From the catalog of metallurgical products, the R of 4mm × 20 mm equilateral angle steel is 3.5 and r is 1.2, then the weight per m = 0.00785 × [4 × (2 × 20 – 4) + 0.215 × (3.52 – 2 × 1.2 2 )]=1.15kg

**Unequal angle steel (kg/m)**

W= 0.00785 ×[d (B+b – d)+0.215 (R2 – 2 r 2 )]

B = long side width

b = short side width

d = side thickness

R = inner arc radius

r = radius of end arc

Find the weight per m of 30 mm × 20 mm × 4 mm unequal angle steel. It is found from the metallurgical product catalog that the R of 30 × 20 × 4 unequal angle steel is 3.5 and r is 1.2, then the weight per m = 0.00785 × [4 × (30+20 – 4) + 0.215 × (3.52 – 2 × 1.2 2 )]=1.46kg

**Channel steel (kg/m)**

W=0.00785 ×[hd+2t (b – d)+0.349 (R2 – r 2 )]

h = high

b = leg length

d = waist thickness

t = average leg thickness

R = inner arc radius

r = radius of end arc

Find the weight per m of a channel steel of 80 mm × 43 mm × 5 mm. It is found from the metallurgical product catalog that the channel steel t is 8, R is 8, r is 4, then the weight per m = 0.00785 × [80 × 5 + 2 × 8 × (43-5) + 0.349 × (82-4 2)]=8.04kg

**I-beam (kg/m)**

W= 0.00785 ×[hd+2t (b – d) + 0.615 (R2 – r 2 )]

h = high

b = leg length

d = waist thickness

t = average leg thickness

R = inner arc radius

r = radius of end arc

Find the weight per m of I-beam of 250 mm ×118mm ×10mm. It is found from the metal material manual that the I-beam t is 13, R is 10, and r is 5, then the weight per m = 0.00785 × [250 × 10 + 2 × 13 × (118 – 10) + 0.615 × (102 – 5 2 )]=42.03kg

**Steel plate (kg/m2)**

W = 7.85 ×d

d = thick

For a steel plate with a thickness of 4mm, find the weight per m2. Weight per m2=7.85 ×4=31.4kg

Steel pipe (including seamless steel pipe and welded steel pipe (kg/m)

W= 0.02466 ×S (D – S)

D = outer diameter

S = wall thickness

For seamless steel tubes with an outer diameter of 60 mm and a wall thickness of 4 mm, find the weight per m. Weight per m = 0.02466 ×4 ×(60 –4)=5.52kg