Metal stock weight calculator

📊 Mathematical basis

Stock mass is computed from volume and material density. Volume is converted to cm³, density ρ is in g/cm³, and mass m is in kilograms:

m [kg] = V [cm³] × ρ [g/cm³] / 1000

Density reference table

Formulas by stock type

• Round (bar)

  D — diameter (mm), L — length in meters (if entered in mm, first L_m = L_mm / 1000), ρ — g/cm³:

  m = π × D² × L × ρ / 4000

  Inverse: L = m × 4000 / (π × D² × ρ)

• Hex bar

  S — across flats (mm), L — length in meters (mm input is converted: / 1000):

  P = (√3 / 2) × S² × ρ / 1000   [kg/m]

  m = P × L

  Inverse: L = m / P

• Sheet

  t — thickness (mm), w — width (mm), l — length in mm (if entered in m, first l_mm = l_m × 1000):

  m = t × w × l × ρ / 10⁶

  Inverse: l = m × 10⁶ / (t × w × ρ)

Equivalent for round bar: V [cm³] = π × (D/20)² × (L × 100), with D in mm and L in meters. In the calculator, length can be entered in m or mm; the value is normalized before applying the formula. The result is rounded to 4 decimal places.