---
title: "Round Bar Weight Calculator"
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![Round Bar Weight Calculator](/images/uploads/1ad2dde4-2b9a-4679-88e9-2215817ae63e/round-bar-weight-calculator-bar-stock-rack-1920x1080.jpg)

Weight

# Round Bar Weight Calculator

Calculate the weight of round steel bar from diameter, length and grade — using that grade's own measured density, not a generic constant. A real GET form: computes correctly with JavaScript off.

   Bar Quantity

 Diameter  mm

 Length  mm

 1 000 mm = 1 m

   Material Steel grade (optional — search by number or designation)  Leave blank to use a generic class estimate instead.

Sourced 7.9 **g/cm³**

1.4301 — Werkstoffnummer catalogue

Sources disagree for this grade

7.9 g/cm³ Werkstoffnummer catalogue 7.85 g/cm³ Splav

 Material class (fallback — used only when no grade above is chosen) Generic (no grade selected)Steel (generic) — 7.85 g/cm³Stainless steel, austenitic (generic) — 7.9 g/cm³Non-ferrous (trade conversion)Titanium (commercially pure) — 4.51 g/cm³Aluminium (generic) — 2.7 g/cm³Copper (generic) — 8.93 g/cm³Brass CuZn40 (60/40, generic) — 8.52 g/cm³ Generic values are class averages, never a substitute for a grade's own measured density.

  Calculate weight [Reset](/calculators/round-bar-weight.md "Reset the calculator to its default values") Recalculates on submit — the same value renders with JavaScript off.

### Result

 Valid range

Weight per piece**2.482 kg**

Weight per metre**2.482 kg**

Total weight (× qty)**2.482 kg**

**m** = (π/4) × d² × L × ρ × 10⁻⁶

Exact π used, not the 0.785 trade shortcut.

**Download as PDF** Result sheet · A4 Run a calculation first — then the sheet is ready to download.

Calculated on SteelEquivalents.com — send us the figures for a quotation.

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## Round bar weight — frequently asked

  Why does the result change when I pick a grade instead of a material class?

Because density varies by grade — the material class value is a generic average, only used as a fallback when no specific grade is chosen.

  What happens if I enter a diameter of 0?

The calculator refuses the input — diameter must be at least 0.1 mm — rather than returning a zero or undefined result.

  What if two grades share the same designation?

The calculator shows both and asks you to pick — it never silently guesses which one you meant.