stone → carat | Converter
Convert stone to carat with the formula below. 1 st ≈ 31,751.4659 ct
Quick Insight
1 stone = 31,751.4659 carat
2.5 st ≈ 79,378.66475 ct; 7.25 st ≈ 230,198.127775 ct
Rounded factors
Relative rounding difference; not measurement uncertainty.
Visual Comparisons
Mathematical Facts
Convert stone to carat with the formula below. ct ≈ st × 31,751.4659. 1 st ≈ 6.35029318 kg; 1 ct ≈ 0.0002 kg A stone is a mass unit of 14 avoirdupois pounds. The result here is decimal stone, not a separate stone-and-pound pair. The metric carat describes gemstone mass and equals 200 milligrams. A mass conversion does not establish a stone’s dimensions or material.
Why This Conversion Matters
Use this pair to compare a gemstone mass record with another mass unit. The calculation concerns the amount of material, not the stone’s diameter or a metal’s purity. Exact unit relationships: 1 st = 14 lb; 1 ct = 200 mg. The calculator uses the full stored factor and rounds displayed results to 12 significant digits. Display precision is not a guarantee of measurement accuracy.
Real-World Examples
Gemstone mass records
A stone is a mass unit of 14 avoirdupois pounds. The result here is decimal stone, not a separate stone-and-pound pair. Use this pair to compare a gemstone mass record with another mass unit. The calculation concerns the amount of material, not the stone’s diameter or a metal’s purity. The examples below are illustrative recorded masses, not standard product sizes or prescribed quantities.
Examples:
- Mass written in decimal stone: 2.5 st ≈ 79,378.66475 ct
- Mass written in decimal stone: 7.25 st ≈ 230,198.127775 ct
Pro Tips:
- ✓Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate.
Quick Reference Table
| stones | carats |
|---|---|
| 1 st | 31,751.4659 ct |
| 2 st | 63,502.9318 ct |
| 5 st | 158,757.3295 ct |
| 10 st | 317,514.659 ct |
| 20 st | 635,029.318 ct |
Formula: ct = st × conversion factor
Common Mistakes to Avoid
Entering a purity rating as though it were a mass in carats
The metric carat is 0.2 g. A purity description is a different kind of quantity, so a mass factor cannot convert it.
✓ Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate. 2.5 st ≈ 79,378.66475 ct.
Pro Tips
- ✓For mixed notation, multiply the fractional stone by 14: 2.5 st means 2 st 7 lb.
- ✓Use ct for mass; a metal-purity karat rating is not a mass value that this converter can transform.
- ✓Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate.
Frequently Asked Questions
How do I calculate the conversion?
ct ≈ st × 31,751.4659. 1 st ≈ 6.35029318 kg; 1 ct ≈ 0.0002 kg
What is an example?
1 st ≈ 31,751.4659 ct; 10 st ≈ 317,514.659 ct; 100 st ≈ 3,175,146.59 ct
Which definitions apply to this pair? (stone → carat)
1 st = 14 lb; 1 ct = 200 mg. For mixed notation, multiply the fractional stone by 14: 2.5 st means 2 st 7 lb. Use ct for mass; a metal-purity karat rating is not a mass value that this converter can transform.
What is the main interpretation mistake to avoid?
The metric carat is 0.2 g. A purity description is a different kind of quantity, so a mass factor cannot convert it. Confirm that the starting number is a measured mass; for carats use 200 mg per ct and keep any purity description separate.
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