Bolt weight calculator
Approximate mass of a hex bolt with nut and washer, from diameter and length.
Inputs
mm
mm
no.
Result
0.000kg
[(π/4) × 0.1² × 0.1] × 1.5 × 1
Formula
W = [ (π/4)·d²·L + 0.5·(π/4)·d²·L ] × 7.85×10⁻⁶ [kg]
An estimate for take-off, not a design check. Structural design, member sizing and connection capacity are separate calculations made by the responsible design authority.
Assumptions and limits
- Calculates the shank as a cylinder, then adds a 50% allowance for the head, nut and washer.
- That allowance suits a standard hex bolt with one nut and one washer. A longer thread, a heavy hex head or two nuts changes it.
- For procurement quantities use the manufacturer’s unit weight from the IS 1367 supply data. This is an estimate for early take-off only.
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