Convert Gram to Carat (g → ct)
The gram is the everyday metric unit for cooking ingredients, postage, and small product weights worldwide.
Gram to Carat Conversion Table
10 common values| Gram | Carat |
|---|---|
| 1 g | 5 ct |
| 5 g | 25 ct |
| 10 g | 50 ct |
| 25 g | 125 ct |
| 50 g | 250 ct |
| 100 g | 500 ct |
| 250 g | 1,250 ct |
| 500 g | 2,500 ct |
| 1,000 g | 5,000 ct |
| 5,000 g | 25,000 ct |
How to Convert Gram to Carat Manually
Step by StepConverting grams to carats is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in gramsStart with the number of grams (g) you want to convert.
- 2Multiply by 5The conversion factor from g to ct is 5. Multiply your value by this number.
- 3Read the result in caratsThe result is your value in carats (ct).
Formula
Multiply the value in grams by 5. For the reverse direction, multiply by 0.2.
ct = g × 5g = ct × 0.2Tips
Use these in everyday conversions- 1 kitchen tablespoon of water weighs about 15 g, but 1 tablespoon of flour is only 8 g — density varies.
- A kitchen scale reads to 1 g; a jewellery scale to 0.01 g.
- Gold is priced by gram in Europe and per troy ounce in international markets.
Common Mistakes
Avoid these- Assuming a tablespoon of any ingredient equals 15 g — true only for water.
- Confusing g (gram) with mg (milligram) on medication labels.
- Using 28 g instead of 28.35 g when converting an ounce in precision baking.
About Gram and Carat
What is the Gram?
The gram equals one thousandth of a kilogram (0.001 kg) and is the everyday metric unit for cooking ingredients, postage, jewelry, pharmaceuticals, and small product weights. Originally defined in 1795 as 'the absolute weight of a volume of pure water equal to a cube of one hundredth of a meter at the temperature of melting ice,' the gram is now formally defined via the kilogram. It relates simply to the milligram (1,000 mg = 1 g) and the kilogram (1,000 g = 1 kg). European nutrition labels universally use grams for ingredient quantities, and recipes worldwide outside North America measure ingredients by mass in grams rather than by volume. Gold and silver are traded in grams for small quantities, while gemstones use carats (0.2 g = 1 carat). A standard paper clip weighs about 1 g.
- European cooking and baking recipes
- Over-the-counter medication dosages
- Gold, silver and gemstone retail (per gram pricing)
A chicken egg weighs about 60 g. A standard bar of chocolate is 100 g. A euro coin weighs 7.5 g.
What is the Carat?
The carat equals exactly 200 milligrams (0.2 g) and is the universal unit for gemstone and diamond weight in the global jewelry industry. The word derives from the Greek 'keration' and the Arabic 'qīrāṭ,' both referring to carob seeds, which were once used as natural counterweights for weighing gems because they have remarkably uniform mass. The metric carat was standardized in 1907 at exactly 200 mg, replacing dozens of regional carat values that had varied between 188 and 213 mg. A 1-carat diamond is roughly 6.5 mm in diameter, and the famous Hope Diamond weighs 45.52 carats. The carat is distinct from the karat (with a 'k'), which measures gold purity (24-karat = 100% gold). It relates to the gram (5 ct = 1 g) and the milligram (200 mg = 1 ct). Gem dealers commonly use 'points' for fractions (100 points = 1 carat).
- Diamond and gemstone retail and valuation
- Jewellery manufacturing and design
- International gem certification (GIA, IGI)
A 1-carat diamond weighs 200 mg and is typically 6.5 mm across. The Hope Diamond is 45.52 carats (9.1 g).