Stone to Carat Converter (and vice versa)
Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026
This converter allows you to convert stone [st.] to carats [ct] or carats [ct] to stone [st.]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.
Convert stone to carats
There are two simple ways to convert stone [st.] to carats [ct]. In the first calculation method, the value in stone [st.] is divided by the rounded conversion factor of 3.149 * 10-5. The second method multiplies the value in stone [st.] by 31,751.4659.
- Carats [ct] ≈ stone [st.] ÷ (3.149 * 10-5)
- Carats [ct] = stone [st.] * 31,751.4659
However, the calculation method with rounded conversion values is only suitable for rough conversions from stone [st.] to carats [ct], as rounding errors may occur in the calculation results. The following formula shows another variant that can be used to calculate results as accurately as possible.
- Carats [ct] = stone [st.] * 6,350.29318 ÷ 109
Convert carats to stone
Converting carats [ct] to stone [st.] is easy and can be done in two ways. The first method involves multiplication, in which the value in carats [ct] is multiplied by the rounded conversion factor of 3.149 * 10-5. The second variant is a division. Here, the value in carats [ct] is divided by 31,751.4659.
- Stone [st.] ≈ carats [ct] * 3.149 * 10-5
- Stone [st.] = carats [ct] ÷ 31,751.4659
However, the version with rounded conversion values can produce somewhat inaccurate calculation results, which is why it is only suitable for rough conversions from carats [ct] to stone [st.]. The formula below shows an alternative method that can be used to calculate results as accurately as possible.
- Stone [st.] = carats [ct] ÷ 6,350.29318 * 109
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