Calculate gold content from measured alloy mass and stated purity, or estimate a solid rectangular band’s mass from its dimensions and alloy density.

Enter the inner diameter, axial width and radial thickness.

Dimensions model a solid band with a rectangular cross-section. Exclude stones, voids and non-gold parts. Gold content uses your stated purity; this does not assay the ring.

10K:11.57,14K:13.07,18K:15.58; pure gold:19.32 g/cm³. 22K/custom purity requires your density. Alloys vary.

Gold Ring Weight Formula

The following two example problems outline the steps and information needed to calculate the Gold Ring Weight.

GRW = RW × P / 100

Variables:

  • GRW is the pure-gold content of the ring (g), rather than its total alloy mass
  • RW is the total ring weight (g) 
  • P is the gold purity percentage (%) 

To calculate pure-gold content, multiply the gold-alloy mass by its purity percentage and divide by100. Nominal karat purity is K/24; use Custom percentage for a stated fineness. Dimension mode instead estimates total alloy mass as π × width × radial thickness × (inner diameter + thickness) × density /1000, with dimensions in mm and density in g/cm³. This assumes a solid rectangular band without stones or voids. Yellow-gold reference densities are approximate and composition-dependent;22K/custom purity requires a known density.

How to Calculate Gold Ring Weight?

The following steps outline how to calculate the Gold Ring Weight.

  1. First, determine the total ring weight (g). 
  2. Next, select the stated karat or enter a custom gold purity percentage (%). 
  3. Next, gather the formula from above = GRW = RW * P / 100.
  4. Finally, calculate the Gold Ring Weight.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total ring weight (g) = 45

gold purity percentage (%) = 50

GRW = RW * P /100 =45 ×50 /100 =22.5 g of pure gold. Select Custom percentage and50% for this example.