# Diamond Carat Calculator

Diamonds symbolize luxury, elegance, and timeless beauty, but when it comes to buying one, **it's not just about the looks: it's also about its weight and size**, and that's where the diamond carat calculator gets in.

Carat weight is one of the most important factors determining a diamond's value. With the help of this diamond carat calculator, you can quickly **calculate the total carat weight of a diamond based on its dimensions** and make an informed buying or selling decision.

So, let's dive into the world of diamonds and explore how to calculate diamond carats.

## How to calculate the carats of a diamond?

Our tool uses the following formulas to calculate the total carat weight of the piece of diamond:

**Asscher**= Length × Width × Depth × 0.0080 × (1 + GT) × (1 + WC);**Baguette**= Length × Width × Depth × 0.00915 × (1 + GT) × (1 + WC);**Cushion**= Length × Width × Depth × 0.00815 × (1 + GT) × (1 + WC);**Emerald**= Length × Width × Depth × AF × (1 + GT) × (1 + WC);**Heart**= Length × Width × Depth × 0.0059 × (1 + GT) × (1 + WC);**Oval**= Length × Width × Depth × 0.0062 × (1 + GT) × (1 + WC);**Princess**= Length × Width × Depth × 0.0083 × (1 + GT) × (1 + WC);**Round**= Diameter² × Depth × 0.0061 × (1 + GT);**Trillion**= Length × Width × Depth × 0.0057 × (1 + GT) × (1 + WC);**Marquise**: Length × Width × Depth × AF × (1 + GT) × (1 + WC);**Pear**: Length × Width × Depth × AF × (1 + GT) × (1 + WC); and**Radiant**: Length × Width × Depth × AF × (1 + GT) × (1 + WC)

💡 where:

**GT**: Girdle thickness factor;**WC**: Weight correction factor; and**AF**: Adjustment factor.

💡 To correctly calculate the total carat weight with the previous formulas, the **length, width, depth, and diameter must be input in millimeters.** For round diamonds, the depth is around 60% of the diameter.

## Girdle thickness, weight correction, and adjustment factor

To know how to calculate the carats of a diamond more accurately, you must consider the following factors:

**GT**is the ratio of the girdle thickness to the diamond diameter, usually expressed as a percentage.- Because of the difficulty of measuring that tiny thickness, most of the time, GT is estimated visually;
- It usually lies between 1% (0.01) and 3% (0.03) for round diamonds.

- The
**weight correction factor**accounts for estimation errors caused by non-regular or non-standard shapes. - The
**adjustment factor**depends on the length-to-width ratio. This diamond carat calculator finds it for you automatically.

Learn more about these three factors in our diamond weight calculator article.

## Other similar tools

Looking for more about diamonds? Check out Omni's collection:

- Diamond size calculator;
- mm to carat conversion; and
- Carat weight calculator.

## FAQ

### What is the weight in carat of an 8×6 mm diamond?

The weight in carats of an 8×6 mm **oval** diamond will be **1.071-carat**, assuming a 3.6 mm depth. The exact answer will depend on the diamond depth, girdle thickness, and geometric irregularities.

### How big is a 2-carat diamond?

A 2-carat round diamond has a diameter or width of **8 mm**, approximately, but the exact weight will depend on the diamond diameter, depth, and girdle thickness. Find it out with our carat calculator!