carat → gram | Converter

Convert carat to gram with the formula below. 1 ct ≈ 0.2 g

Quick Insight

1 carat = 0.2 gram

0.5 ct ≈ 0.1 g; 2.5 ct ≈ 0.5 g

💡 Tip: Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate.

Gemstone mass recordsRecorded gemstone mass

Quick Values:

From

0.2

Formula: g ≈ ct × 0.2

Rounded factors

Relative rounding difference; not measurement uncertainty.

0.2

2 significant digits

0.2

6 significant digits

0.2

12 significant digits

Visual Comparisons

⚖️

0.1 ct → 0.02 g

⚖️

0.5 ct → 0.1 g

⚖️

1 ct → 0.2 g

⚖️

2 ct → 0.4 g

⚖️

5 ct → 1 g

Mathematical Facts

📐Conversion formula: g ≈ ct × 0.2

🔄Reverse conversion: ct ≈ g × 5

Convert carat to gram with the formula below. g ≈ ct × 0.2. 1 ct ≈ 0.0002 kg; 1 g ≈ 0.001 kg The metric carat describes gemstone mass and equals 200 milligrams. A mass conversion does not establish a stone’s dimensions or material. A gram reading is a mass measurement, for example for an ingredient or small component. It does not specify the volume occupied.

Why This Conversion Matters

Use this pair to compare a gemstone mass record with another mass unit. The calculation concerns the amount of material, not the stone’s diameter or a metal’s purity. Exact unit relationships: 1 ct = 200 mg; 1 g = 1,000 mg. The calculator uses the full stored factor and rounds displayed results to 12 significant digits. Display precision is not a guarantee of measurement accuracy.

Real-World Examples

Gemstone mass records

The metric carat describes gemstone mass and equals 200 milligrams. A mass conversion does not establish a stone’s dimensions or material. Use this pair to compare a gemstone mass record with another mass unit. The calculation concerns the amount of material, not the stone’s diameter or a metal’s purity. The examples below are illustrative recorded masses, not standard product sizes or prescribed quantities.

Examples:

Recorded gemstone mass: 0.5 ct ≈ 0.1 g
Recorded gemstone mass: 2.5 ct ≈ 0.5 g

Pro Tips:

✓Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate.

Quick Reference Table

carats	grams
10 ct	2 g
50 ct	10 g
100 ct	20 g
500 ct	100 g
1,000 ct	200 g

Formula: g = ct × conversion factor

Common Mistakes to Avoid

Entering a purity rating as though it were a mass in carats

The metric carat is 0.2 g. A purity description is a different kind of quantity, so a mass factor cannot convert it.

✓ Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate. 0.5 ct ≈ 0.1 g.

Pro Tips

✓Use ct for mass; a metal-purity karat rating is not a mass value that this converter can transform.
✓Do not read a gram result as milliliters or spoonfuls; a mass-to-volume conversion also needs density.
✓Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate.

Sources and unit definitions

Frequently Asked Questions

How do I calculate the conversion?

g ≈ ct × 0.2. 1 ct ≈ 0.0002 kg; 1 g ≈ 0.001 kg

What is an example?

1 ct ≈ 0.2 g; 10 ct ≈ 2 g; 100 ct ≈ 20 g

Which definitions apply to this pair? (carat → gram)

1 ct = 200 mg; 1 g = 1,000 mg. Use ct for mass; a metal-purity karat rating is not a mass value that this converter can transform. Do not read a gram result as milliliters or spoonfuls; a mass-to-volume conversion also needs density.

What is the main interpretation mistake to avoid?

The metric carat is 0.2 g. A purity description is a different kind of quantity, so a mass factor cannot convert it. Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate.