Density and Mass
grtoct
Convert grains (gr) to metric carats (ct).
Factor1 gr = 0.3239945 ct
Converter
gr
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ct
Rendered to 6 significant figures.
Formula
Formula
ct = gr × 0.3239945
Multiply any value in grains by 0.3239945 to obtain the value in metric carats.
Worked example
Convert 100 gr to ct.
- 01Start with 100 gr.
- 02Multiply by the conversion factor: 100 × 0.3239945 = 32.3995 ct.
Result100 gr = 32.3995 ct
Conversion table
| gr | ct |
|---|---|
| 1 | 0.32399 |
| 2 | 0.64799 |
| 5 | 1.62 |
| 10 | 3.2399 |
| 20 | 6.4799 |
| 50 | 16.2 |
| 100 | 32.399 |
| 200 | 64.799 |
| 500 | 162 |
| 1000 | 323.99 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from gr to ct?
1 gr equals 0.3239945 ct. To convert, multiply the value in grains by 0.3239945.
How do I convert 1 gr to ct?
1 gr = 0.323995 ct. For any value, multiply by 0.3239945.
How do I convert ct back to gr?
Divide by the same factor — or equivalently, multiply by 3.086472. So 1 ct = 3.08647 gr.
When would I need to convert grain (troy/apothecary) to metric carat?
Mass conversions appear in material balances, reagent dosing, and reconciling vendor specifications across imperial/metric systems.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).