Diamond Weight Calculator Formula

Diamonds are one of the most coveted gemstones in the world, known for their brilliance and timeless beauty. When purchasing a diamond, one of the crucial factors to consider is its weight or carat size. To help you estimate the weight of a diamond, we have developed a user-friendly Diamond Weight Calculator.


The formula used by our Diamond Weight Calculator is a straightforward one: Weight (carats) = Length (mm) x Width (mm) x Depth (mm) x 0.0061. This formula takes into account the dimensions of the diamond in millimeters and calculates its approximate weight in carats.

How to Use

Using our Diamond Weight Calculator is a breeze. Simply follow these steps:

  1. Enter the length of the diamond in millimeters.
  2. Enter the width of the diamond in millimeters.
  3. Enter the depth of the diamond in millimeters.
  4. Click the “Calculate” button.

The calculator will instantly provide you with the estimated weight of the diamond in carats.


Let’s say you have a diamond with the following dimensions:

  • Length: 5.2 mm
  • Width: 5.2 mm
  • Depth: 3.1 mm

Using the calculator, you can determine the estimated weight of this diamond. After entering the dimensions and clicking “Calculate,” the result will be displayed as “Estimated Diamond Weight: 0.99 carats.”


  1. What is the Diamond Weight Calculator?
    • Our Diamond Weight Calculator is a tool that estimates the weight of a diamond based on its dimensions in millimeters.
  2. Is the calculated weight accurate?
    • The weight provided is an approximation and may not be 100% accurate due to variations in diamond density.
  3. Why is the weight in carats?
    • Carats are the standard unit of measurement for diamond weight in the jewelry industry.
  4. Can I use this calculator for other gemstones?
    • This calculator is specifically designed for diamonds and may not be suitable for other gemstones.
  5. Is this calculator suitable for all diamond shapes?
    • Yes, it can be used for various diamond shapes, including round, princess, and emerald cuts.
  6. What is the significance of a diamond’s weight?
    • A diamond’s weight affects its value, with larger diamonds generally being more expensive.
  7. Is this calculator applicable to rough diamonds?
    • This calculator is primarily for estimating the weight of cut and polished diamonds.
  8. What if my diamond has irregular dimensions?
    • Enter the average dimensions for the most accurate estimate.
  9. Can I trust this estimate for buying or selling diamonds?
    • It’s advisable to get a professional evaluation for any significant transactions.
  10. What are the units for length, width, and depth?
    • The dimensions should be entered in millimeters.


Our Diamond Weight Calculator is a useful tool for quickly estimating the weight of a diamond based on its dimensions. While it provides a good estimate, it’s essential to remember that professional grading and evaluation are required for precise measurements and valuations when dealing with valuable diamonds. We hope this calculator simplifies your jewelry-related decisions and helps you better understand your gem’s approximate weight.

Leave a Comment