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carats to stone | Exact Decimal + Stone/Pounds

1 Carat = 0.000031 Stone

Conversions between Carat (ct) and Stone (st) are essential in the weight & mass category. This tool provides a quick, free, and accurate way to convert carats to stones for academic, professional, or personal calculations. Check the detailed conversion table and formula explanation below for more context.

Weight & Mass Converter

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Formula

st = ct × 0.000031495

To convert Carat to Stone, use the formula displayed above.

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Carat to Stone: Quick Reference Table

Carat Stone (Decimal) Fraction
0.001 ct 3.1495e-8 st -
0.01 ct 3.1495e-7 st -
0.1 ct 0.000003 st -
0.5 ct 0.000016 st -
1 ct 0.000031 st -
2 ct 0.000063 st -
5 ct 0.000157 st -
10 ct 0.000315 st -
25 ct 0.000787 st -
50 ct 0.001575 st -
100 ct 0.003149 st -
250 ct 0.007874 st 1/64 st
500 ct 0.015747 st 1/64 st
1000 ct 0.031495 st 1/32 st

ct to st Formula and Examples

Direct Formula st = ct × 0.000031495
Inverse Formula ct = st × 31751.4659
Mental Math Shortcut

Divide the value by roughly 31751.5 to quickly estimate the converted result.

Common Carat to Stone Calculations

  • 5 ct = 0.000157 st
  • 10 ct = 0.000315 st
  • 50 ct = 0.001575 st
  • 100 ct = 0.003149 st
  • 500 ct = 0.015747 st

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How to Convert Carat to Stone

How many stones are in a carat?
1 Carat (ct) is equal to 0.000031 Stone (st). To convert carats to stones, multiply your value by 0.000031.
How do I convert carat to stone?
To convert Carat to Stone, use the formula: Stone = Carat × 0.000031. For example, 5 ct = 0.000157 st.
What is the formula for ct to st?
The formula is: st = ct × 0.000031. This is based on the exact SI conversion factor. Use our calculator above to convert any value instantly.