The Gold Ring Weight Calculator is a tool that helps you find the weight of a gold ring based on its dimensions and gold purity. This calculator is part of the jewelry calculation category. It is useful for jewelers, gold traders, and customers who want to know the estimated weight without physically measuring the ring. By using simple measurements like inner diameter, band width, band thickness, and gold purity, you can get an accurate weight in grams. This is especially helpful for cost estimation, resale evaluation, or custom design purposes.
formula
This is the main formula to calculate the final weight of the gold ring in grams.
Ring Weight (in grams) = (Ring Volume / 1000) * Density of Gold Alloy
Component Formulas
1. Ring Volume
This formula calculates the physical volume of the ring's material in cubic millimeters (mm³), approximating the ring as a flat-sided, hollow cylinder.
Ring Volume (in mm³) = (3.14159 / 4) * (Outer Diameter² - Inner Diameter²) * Band Width
3.14159 is the value of Pi (π)
Outer Diameter is a required sub-calculation
Inner Diameter is the hole size where the finger goes, measured in millimeters
Band Width is the width of the ring as it sits on the finger, measured in millimeters
2. Outer Diameter (Sub-Calculation)
Outer Diameter = Inner Diameter + (2 * Band Thickness)
Band Thickness is the thickness of the metal from the inner surface to the outer surface of the ring, measured in millimeters
3. Density of Gold Alloy
Density changes according to the gold’s purity. Below are approximate densities for common yellow gold types:
10K Gold: 11.57 g/cm³
14K Gold: 13.07 g/cm³
18K Gold: 15.58 g/cm³
22K Gold: 17.8 g/cm³
24K Gold: 19.32 g/cm³
Gold Weight Reference Table
The following table shows approximate weights for a standard flat-band gold ring of 2mm thickness and 4mm width based on common inner diameters and gold purity.
| Inner Diameter (mm) | 10K Gold (g) | 14K Gold (g) | 18K Gold (g) | 22K Gold (g) | 24K Gold (g) |
|---|---|---|---|---|---|
| 16.0 | 2.65 | 2.99 | 3.56 | 4.06 | 4.41 |
| 17.0 | 2.82 | 3.18 | 3.78 | 4.31 | 4.68 |
| 18.0 | 2.99 | 3.37 | 4.00 | 4.56 | 4.95 |
| 19.0 | 3.15 | 3.55 | 4.22 | 4.81 | 5.22 |
| 20.0 | 3.32 | 3.74 | 4.44 | 5.06 | 5.49 |
This table is a quick reference so you don’t have to calculate from scratch every time.
Example
Let’s calculate the weight of a gold ring with the following details:
Inner Diameter = 18 mm
Band Thickness = 2 mm
Band Width = 4 mm
Gold Purity = 18K
Step 1: Calculate Outer Diameter
Outer Diameter = 18 + (2 × 2) = 22 mm
Step 2: Calculate Ring Volume
Ring Volume = (3.14159 / 4) × (22² - 18²) × 4
Ring Volume = 0.7853975 × (484 - 324) × 4
Ring Volume = 0.7853975 × 160 × 4 = 502.6544 mm³
Step 3: Convert Volume to cm³
Volume in cm³ = 502.6544 / 1000 = 0.5026544 cm³
Step 4: Multiply by Density of 18K Gold
Ring Weight = 0.5026544 × 15.58 = 7.82 grams
Final estimated weight = 7.82 g
Most Common FAQs
It is highly accurate if you measure dimensions correctly and use the correct density value for your gold purity.
Yes, but the density will vary depending on the metal mixture. You need the correct density for that alloy.
Density determines how heavy the gold is for a given volume. Higher purity gold has higher density and will weigh more for the same size ring.