How to Convert Grams to Carats (g to ct)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert grams into carats by hand, with examples and a quick-reference table.
The conversion
To convert grams to carats, multiply the value by 5. To go the other way, divide by the same number (or multiply by 0.2). For a quick estimate, multiply by about 5.
Carats = grams × 5
Worked examples
- 3 g = 15 ct
- 12.5 g = 62.5 ct
- 75 g = 375 ct
Grams to Carats table
| Grams | Carats |
|---|---|
| 1 g | 5 ct |
| 2 g | 10 ct |
| 5 g | 25 ct |
| 10 g | 50 ct |
| 20 g | 100 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 |
Common questions
Is g to ct exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Carats to Grams converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Grams to Carats Converter or browse all weight converters.
Run your own numbers: Grams to Carats Converter