Foundation Bolt Weight Calculator (kg)

Calculate the weight in kilograms of L type, J type, straight, plate-welded, sag rod, bracing rod and stud bolts from M12 to M36. Bend and hook allowance is applied automatically, and nuts and washers are included in the total. Manufacturing since 1924 · ISO 9001:2015 · no minimum order · MTC with every batch.

When the figures are right, send the same sheet straight to our works as an enquiry — there is no minimum order and every batch ships with a Mill Test Certificate.

Foundation Bolt Weight Calculator

Calculate theoretical weights for foundation bolts, sag rods, bracing rods, stud bolts and flanges. Build an order list and request a quotation.

1. Select Item Type

2.

{{ mode==='flange' ? 'Item' : 'Bolt Type' }}

{{ modeTitle }}

  • {{ l.sym }} {{ l.text }}

All dimensions in mm. Weights are theoretical. Actual weight may vary due to manufacturing tolerances.

Enquiries

Uploading drawing
{{ toastMsg }}

Anchor Bolt Weight Calculator

Foundation bolts and anchor bolts are cut from the same round bar stock, so the calculator above works identically for anchor bolts. Enter the diameter, the leg and hook lengths from your drawing and the thread length, and the anchor bolt weight is returned in kg including nuts and washers. For an anchor fastener assembly, add the plate and washer weights as separate rows on the order pad.

J Bolt Weight Calculator

Select the J type profile to calculate J bolt weight. The hook radius allowance is added automatically, which is why a J bolt is heavier than a straight bolt of the same nominal length. See the J type foundation bolt page for sizes, grades and standards, or the L type foundation bolt page to compare.

Common Sizes: M16, M20, M24 and M30

An M16 foundation bolt weighs 1.578 kg per metre of plain 16 mm round bar before bends, threads, nuts and washers.

An M20 foundation bolt weighs 2.466 kg per metre of plain 20 mm round bar. M20 is the most commonly specified size for PEB column bases.

An M24 foundation bolt weighs 3.551 kg per metre of plain 24 mm round bar.

An M30 foundation bolt weighs 5.549 kg per metre of plain 30 mm round bar. For sizes above M36, and up to M100, send your drawing for a quote.

Use the calculator above for the finished weight of any of these sizes — it accounts for the bend, the thread length and the fittings, which the per-metre figure does not.

Foundation Bolt Weight Chart & Anchor Bolt Weight Chart (M12–M36)

Manufacturing since 1924 · ISO 9001:2015 · No minimum order · MTC with every batch

This bolt weight chart gives base weight per metre for solid mild steel round bar, before bends, threads, nuts or washers. For an exact nut bolt weight calculator in kg for any type — L, J, straight, plate-welded, sag rod, bracing rod or stud — use the calculator above, which accounts for bend allowance and fittings.

SizeDiameterWeight per Metre
M1212mm0.888 kg/m
M1616mm1.578 kg/m
M2020mm2.466 kg/m
M2424mm3.551 kg/m
M2727mm4.494 kg/m
M3030mm5.549 kg/m
M3232mm6.313 kg/m
M3636mm7.990 kg/m

These figures are for foundation bolts and anchor bolts alike, since both start from the same round bar stock. J bolt weight follows the same base chart plus the hook allowance the calculator adds automatically — see our J-type foundation bolt page for sizes and grades, or our anchor bolt manufacturer page.

Frequently Asked Questions

Is this foundation bolt weight calculator free to use?

Yes, it is free with no sign-up required, for L-type, J-type, straight, plate-welded, sag rod, bracing rod and stud bolts from M12 to M36.

Does the calculator include the weight of nuts and washers?

Yes. Select the number of nuts in the form and the calculator adds their weight to the total, alongside the bolt itself.

How do I calculate bolt weight in kg manually?

For a straight mild steel bar, multiply the length in metres by the weight-per-metre figure for that diameter (see the reference table above). Bent types such as L-type and J-type need additional allowance for the bend, which the calculator above accounts for automatically.

Can I use this calculator for anchor bolt weight as well as foundation bolts?

Yes. Foundation bolts and anchor bolts share the same base weight calculation, since both are manufactured from the same round bar stock in the same diameters and grades.

Where can I find a J bolt weight chart?

The reference table above gives base weight per metre by diameter. Select J Type in the calculator to get the exact J bolt weight including the hook allowance, nuts and washers for your specific size.

Do you manufacture the bolts calculated here?

Yes. E S HAJI & CO manufactures every bolt type in this calculator, M12 to M100, since 1924, with no minimum order quantity and a Mill Test Certificate on every batch.

Need these bolts manufactured?

We manufacture every bolt type in this calculator from M12 to M100, to your specification, with Mill Test Certificates.

Get a quote for these bolts →

Also Sourcing Fabrication or Flanges for This Project?

Many of our bolt customers need structural fabrication, custom flanges or PEB accessories on the same project. We manufacture all of it in-house, in Chennai, with no minimum order.