Bolt Weight Calculator Excel

The calculated bolt weight will appear here.

Calculating the weight of a bolt is essential for various applications, whether you are working in construction, engineering, or manufacturing. This Bolt Weight Calculator simplifies the process by allowing you to input key parameters and receive the calculated bolt weight.


The formula for calculating the weight of a bolt is based on the bolt’s volume, material density, and thread type density. The formula can be described as follows:

  • Bolt Weight (grams) = (π * (Bolt Diameter/2)^2 * Bolt Length * Material Density) + (Thread Length * Thread Type Density)


  • Bolt Diameter is the diameter of the bolt in millimeters.
  • Bolt Length is the length of the bolt in millimeters.
  • Material Density is the density of the bolt material (e.g., steel, aluminum, copper) in grams per cubic millimeter (g/mm^3).
  • Thread Type Density is the density of the thread type (e.g., fine, coarse) in grams per millimeter (g/mm).

How to Use

  1. Enter the Bolt Diameter in millimeters.
  2. Enter the Bolt Length in millimeters.
  3. Select the Bolt Material from the dropdown list.
  4. Select the Thread Type from the dropdown list.
  5. Click the “Calculate” button to get the bolt weight.


Let’s say you have a steel bolt with a diameter of 10 mm, a length of 50 mm, and it has a fine thread. Using the Bolt Weight Calculator, the estimated bolt weight is calculated as follows:

  • Bolt Diameter: 10 mm
  • Bolt Length: 50 mm
  • Bolt Material: Steel
  • Thread Type: Fine

After clicking “Calculate,” the calculator will display the bolt weight, which is approximately 77.96 grams.


  1. What units does this calculator use?
    • This calculator uses millimeters for bolt dimensions and grams for weight.
  2. Can I calculate the weight of bolts with custom materials?
    • Currently, the calculator supports standard materials like steel, aluminum, and copper. If you have a custom material, you can approximate its density.
  3. Is this calculator suitable for all types of bolts?
    • This calculator is designed for typical bolts with cylindrical shapes and thread types. Unconventional bolt shapes may not provide accurate results.
  4. Why is thread type important in the calculation?
    • Thread type affects the weight, as finer threads have more material, increasing the weight compared to coarse threads.
  5. What is the significance of bolt weight in practical applications?
    • Bolt weight is crucial in structural engineering, load-bearing calculations, and ensuring the safety and stability of structures.
  6. How precise are the results from this calculator?
    • The calculator provides reasonably accurate estimates, but for highly critical applications, it’s recommended to use certified measurements.
  7. Can I use this calculator for other threaded objects like screws and nails?
    • While it’s designed for bolts, you can adapt it for similar threaded objects by adjusting the parameters.
  8. What is the density of common bolt materials?
    • Steel: 7.85 g/mm^3
    • Aluminum: 2.70 g/mm^3
    • Copper: 8.92 g/mm^3
  9. Is there a weight limit for the bolt length or diameter in the calculator?
    • The calculator does not impose strict limits, but extremely large values may result in unrealistic weight estimates.
  10. Can I calculate bolt weight in other units, such as kilograms or ounces?
    • This calculator specifically provides weight in grams, but you can convert the result to other units as needed.


The Bolt Weight Calculator is a valuable tool for anyone working with bolts and requiring quick estimates of their weight. Whether you’re involved in construction, manufacturing, or any project involving bolts, this calculator simplifies the process and provides useful insights into your materials and designs. Remember that while it offers accurate estimates, it’s always a good practice to verify measurements for critical applications.

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