How to Convert Carats to Ounces (ct to oz)
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 carats into ounces by hand, with examples and a quick-reference table.
The conversion
To convert carats to ounces, multiply the value by 0.0070547924. To go the other way, divide by the same number (or multiply by 141.747615625). For a quick estimate, multiply by about 0.0071.
Ounces = carats × 0.0070547924
Worked examples
- 3 ct = 0.021164 oz
- 12.5 ct = 0.088185 oz
- 75 ct = 0.529109 oz
Carats to Ounces table
| Carats | Ounces |
|---|---|
| 1 ct | 0.007055 oz |
| 2 ct | 0.01411 oz |
| 5 ct | 0.035274 oz |
| 10 ct | 0.070548 oz |
| 20 ct | 0.141096 oz |
| 25 ct | 0.17637 oz |
| 50 ct | 0.35274 oz |
| 100 ct | 0.705479 oz |
| 250 ct | 1.7637 oz |
| 500 ct | 3.5274 oz |
| 1,000 ct | 7.0548 oz |
Common questions
Is ct to oz 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 Ounces to Carats converter.
Mistakes to avoid
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
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.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
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.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For any value, use the Carats to Ounces Converter or browse all weight converters.
Run your own numbers: Carats to Ounces Converter