Carat Weight Calculator

Estimate a round diamond's carat weight from its measurements.

Average diameter

Depth

Estimated weight (ct) 1.031

Formula: weight = diameter^2 * depth * 0.0061

Step-by-step with your numbers:

1. Values used:

2. Average diameter = 6.5

3. Depth = 4

5. Estimated weight = 1.031ct

Did we solve your problem today?

Estimate a round brilliant diamond's carat weight from its diameter and depth.

The math behind it

weight (ct) = diameter^2 x depth x 0.0061 for a round brilliant cut.

A 6.5 mm stone about 4 mm deep is roughly 1.0 carat.

Is this exact?

It's an estimate - actual weight varies with cut proportions and girdle thickness.