How to Use Diamond Weight Calculator
Enter the measured length, width, and height of the stone in millimeters. The calculator multiplies the three dimensions by the common 0.0061 approximation factor and returns estimated carat weight. Use caliper measurements when possible because small dimension changes can noticeably change carats.
Formula & Theory - Diamond Weight Calculator
The carat estimate multiplies the three measured dimensions by a shape factor:
carat weight = length(mm) × width(mm) × height(mm) × 0.0061The factor 0.0061 compresses density, shape, and cut assumptions into one practical multiplier. A deeper stone with the same face-up length and width will estimate heavier because height is part of the product. A shallow stone will estimate lighter. Certified scales and gem reports are still required for pricing, insurance, or appraisal.
Use Cases for Diamond Weight Calculator
- Jewelry estimates - Get a quick carat approximation when only dimensions are known.
- Stone comparison - Compare how depth or width changes affect estimated weight.
- Learning formulas - Understand why carat estimates depend on three-dimensional size, not face-up size alone.
Use the calculator for a quick dimensional estimate, then rely on certified carat weight when money or documentation is involved.