Carat to Petagram Converter
Unit Converter
Instant · Precise · Universal
34 units available
6 categories total
How to Convert Carat to Petagram
To convert carats to grams: multiply by 0.2. To convert grams to carats: multiply by 5.
1 ct = 0.2 g = 200 mg = 0.007055 oz.
For example, 1 Carat (ct) = 2.000000e-16 Petagram (Pg).
Carat to Petagram — Common Values
| Carat (ct) | Petagram (Pg) |
|---|---|
| 0.1 | 2.000000e-17 |
| 0.5 | 1.000000e-16 |
| 1 | 2.000000e-16 |
| 2 | 4.000000e-16 |
| 5 | 1.000000e-15 |
| 10 | 2.000000e-15 |
| 25 | 5.000000e-15 |
| 50 | 1.000000e-14 |
| 100 | 2.000000e-14 |
| 500 | 1.000000e-13 |
| 1000 | 2.000000e-13 |
About Carat (ct)
Definition
The carat is a unit of mass used for gemstones and pearls, equal to exactly 200 milligrams (0.2 grams).
Mathematical Relationship
1 ct = 0.2 g = 200 mg = 0.007055 oz.
Conversion Formula
To convert carats to grams: multiply by 0.2. To convert grams to carats: multiply by 5.
Practical Applications
Diamond grading and pricing, gemstone trade, pearl classification, and jewelry appraisal.
Interesting Facts
The Hope Diamond weighs 45.52 ct (9.1 g). The Cullinan Diamond, the largest gem-quality rough diamond ever found, was 3,106 ct (621 g).
Common Mistakes
Confusing carat (ct, mass) with karat (K, gold purity). 24K gold is pure gold; a 24-carat diamond weighs 4.8 g.
Educational Tips
Carat = weight of a gem. Karat = purity of gold. They sound the same but measure completely different things.
About Petagram (Pg)
Definition
The petagram equals 10¹⁵ grams or one billion tonnes (one gigatonne).
Mathematical Relationship
1 Pg = 10¹⁵ g = 10¹² kg = 10⁹ tonnes = 1 gigatonne.
Conversion Formula
To convert Pg to tonnes: multiply by 10⁹. To convert Pg to Tg: multiply by 1,000.
Practical Applications
Global carbon budgets: about 10 Pg of carbon are emitted annually from fossil fuels.
Interesting Facts
The total mass of all life on Earth is estimated at about 550 Pg of carbon.
Common Mistakes
Confusing Pg (petagram = 10¹⁵ g) with PB (petabyte). In mass contexts, P = peta = 10¹⁵.
Educational Tips
1 Pg C = 1 gigatonne of carbon. Annual human CO₂ emissions are about 10 Pg C — a key climate figure.