How To Convert Gram to Carats
Conversion for 1 unit: 1 gram = 5 carats.
Example: Convert 3.4 grams to carats. Multiply 3.4 by 5, so 3.4 grams = 17 carats.
To do it by hand, you only need one fact, 1 carat is exactly 0.2 gram.
That means grams are heavier than carats, so the carat number is always bigger.
Multiply grams by 5 to get carats, or divide carats by 5 to get grams.
Quick Answer
1 gram = 5 carats
- 0.5 gram = 2.5 carats
- 2 grams = 10 carats
- 7.2 grams = 36 carats
Conversion Formula
Recommended (international standard): 1 carat = 0.2 gram (exact)
carats = grams × 5
grams = carats ÷ 5This works because the carat is defined as exactly 0.2 gram. If 1 carat is 0.2 gram, then 1 gram is five times that amount, which is 5 carats.
- Start with your value in grams.
- Multiply by 5 to get carats.
- If you have carats and want grams, divide by 5.
Gram
A gram is a metric unit of mass used for small weights. Its symbol is g.
The gram comes from the metric system developed in France. Today it is used worldwide as part of the SI system through the kilogram and its decimal parts.
- Weighing food ingredients in cooking and baking
- Measuring medicine doses and supplements
- Checking package weights in shipping and retail
- Laboratory measurements for chemicals and samples
- Weighing small items like coins and hardware
Carat
A carat is a unit of mass for gemstones. Its symbol is ct.
The modern carat was standardized internationally so gem weights match across countries. It is defined as exactly 0.2 gram, which makes conversions precise and consistent.
- Weighing diamonds, rubies, sapphires, and other gems
- Comparing gemstone sizes when shopping for jewelry
- Gem lab reports and appraisal documents
- Setting pricing in the gemstone trade
- Sorting stones by weight in manufacturing
Is this Conversion of Gram To Carats Accurate?
Yes. This conversion is exact because the modern carat is defined by an international standard as precisely 0.2 gram. Our converter uses that fixed definition, so results are reliable for jewelry work, pricing, lab reports, and general calculations. For how we verify unit definitions and rounding rules, read our accuracy standards.
Real Life Examples
Grams and carats often appear in jewelry, gem reports, and buying or selling gemstones. Here are realistic examples you can use right away.
- A small diamond: A 0.20 ct diamond weighs 0.04 g, because 0.20 ÷ 5 = 0.04.
- Matching a gem report to a scale: Your report says 1.25 ct. On a gram scale you should see about 0.25 g, because 1.25 ÷ 5 = 0.25.
- Buying loose stones by gram: A seller lists tiny stones as 2 g total. That is 10 ct total, because 2 × 5 = 10.
- Parcel of gemstones: A parcel weighs 7.5 g. In carats that is 37.5 ct, because 7.5 × 5 = 37.5.
- Comparing two offers: Offer A is 3.0 g of stones, offer B is 14 ct. Offer A is 15 ct, because 3.0 × 5 = 15, so it is slightly heavier.
- Setting weight targets: You need a total of 50 ct for a design. In grams that is 10 g, because 50 ÷ 5 = 10.
- Checking a scale reading: A diamond is listed as 0.90 ct. If your scale shows 0.18 g, it matches, because 0.90 ÷ 5 = 0.18.
Quick Tips
- To go from grams to carats, multiply by 5.
- To go from carats to grams, divide by 5.
- Easy memory: 0.2 g = 1 ct, so 1 g = 5 ct.
- For halves: 0.5 g = 2.5 ct.
- For tenths: 0.1 g = 0.5 ct.
- When checking a gem report, a quick gram estimate is ct ÷ 5.