Round Bar Weight Calculator

Quick Answer

• Round Bar Weight = π × D² / 4 × L × Density
• Input units:
  • Diameter (mm)
  • Length (mm)
  • Density (g/cm³)
• Output:
  • Weight (kg)

Formula

W = pi times frac times L times rho

👉 Where:

• W = Weight
• D = Diameter (mm)
• L = Length (mm)
• ρ (Density) = g/cm³

How It Works

1. Select material (density auto-filled)
2. Enter diameter (mm)
3. Enter length (mm)
4. Input quantity
5. Get total weight instantly

✔ Real-time calculation
✔ Supports multiple materials
✔ Accurate for engineering use

Unit Conversion Note

The calculator automatically converts:

• mm³ → cm³
• g → kg

👉 So you can directly input mm + g/cm³ and get kg result

Common Material Density

Example Calculation

Material: Steel
Diameter: 20 mm
Length: 1000 mm

Step 1: Cross-section area
π × 20² / 4 = 314.16 mm²

Step 2: Volume
314.16 × 1000 = 314,160 mm³ = 314.16 cm³

Step 3: Weight

Weight = 314.16 times 7.85 approx 2.47 kg

Engineering Insight

Why this matters:

• Raw material estimation before machining
• Quotation accuracy for CNC parts
• Shipping weight calculation
• Material selection optimization

Applications

• CNC turned parts
• Shafts and pins
• Fasteners and rods
• Automotive and aerospace components

FAQ

Is the result accurate?

Yes, it is accurate for standard engineering calculations. Minor deviations may occur due to material tolerances.

Can I use custom materials?

Yes, simply input your own density value.

Does it support multiple pieces?

Yes, enter quantity to get total weight.

What if I use inches?

Convert to mm first or use a unit conversion calculator.

Related Calculators

• Metal Weight Calculator
• Pipe Weight Calculator
• Sheet Metal Weight Calculator
• Density Calculator