Carat Weight Calculator
Calculate diamond carat weight from dimensions and convert to other units
Calculate Diamond Carat Weight
Round diamonds comprise about 75% of all diamonds sold
Optional Adjustments
Range: -5% to +18%
Estimated Diamond Weight
Quick Examples
1 Carat Round Diamond
Diameter: ~6.5 mm
Depth: ~4.0 mm
Weight: 1.00 ct (0.2 g)
0.5 Carat Princess
Length: ~4.4 mm
Width: ~4.4 mm
Depth: ~3.2 mm
Weight: 0.50 ct (0.1 g)
2 Carat Oval
Length: ~9.0 mm
Width: ~6.5 mm
Depth: ~4.2 mm
Weight: 2.00 ct (0.4 g)
Diamond 4Cs
Carat
Weight measurement
1 carat = 0.2 grams
Cut
Quality of proportions
Affects brilliance & fire
Color
Absence of color
D (colorless) to Z (yellow)
Clarity
Absence of inclusions
FL (flawless) to I3 (included)
Quick Tips
1 carat = 0.2 grams = 200 milligrams
Round diamonds are most popular (75% of sales)
Fancy shapes often cost less per carat
Measurements should be accurate to 0.01mm
Understanding Diamond Carat Weight
What is Carat Weight?
Carat weight is one of the famous 4Cs used to evaluate diamonds. One carat equals 0.2 grams or 200 milligrams. The term "carat" comes from the ancient practice of using carob seeds as counterweights on balance scales.
How is it Calculated?
- •Based on diamond dimensions and shape-specific formulas
- •Accounts for shape density differences
- •Considers girdle thickness and cutting irregularities
- •More accurate than visual estimation
Diamond Shape Factors
Important Notes
• Girdle thickness affects final weight (0.5% - 7%)
• Correction factors account for cutting irregularities
• Professional appraisal recommended for valuable stones
• Calculator provides estimates, not certified weights