Stone to Carat Conversion Calculator: Free Online Tool

Convert stones to carats with our free online weight converter.

From:

Stone

To:

Carat

How to Use the Calculator:

Enter the value you want to convert in the 'From' field (Stone).
The converted value in Carat will appear automatically in the 'To' field.
Use the dropdown menus to select different units within the Weight category.
Click the swap button (⇌) to reverse the conversion direction.

How to Convert Stone to Carat

Converting Stone to Carat involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

1 Stone = 31751.5 carats

Example Calculation:

Convert 5 stones: 5 × 31751.5 = 158758 carats

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

What is a Stone and a Carat?

The stone (st) is a unit of mass in the British imperial system, defined as exactly 14 avoirdupois pounds. This is equivalent to approximately 6.35 kilograms.

The carat is a unit of mass used for measuring gemstones and pearls. It is defined as exactly 200 milligrams (0.2 grams).

Note: The Stone is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Carat belongs to the imperial/US customary system.

History of the Stone and Carat

The stone has historical roots in trade, where actual stones were used as weights. Its value varied significantly by commodity and region before being standardized at 14 pounds in Britain for general purposes.

The term "carat" comes from the carob seed ("keration" in Greek), which was historically used as a standard for weighing small quantities due to its perceived uniform weight. The metric carat of 200 mg was adopted internationally in 1907.

Common Uses for stones and carats

Explore the typical applications for both Stone (imperial/US) and Carat (imperial/US) to understand their common contexts.

Common Uses for stones

Body Weight: Primarily used in the UK and Ireland to express human body weight.
Animal Weighing: Occasionally used informally for weighing large animals or agricultural produce in some Commonwealth countries.
Historical Usage: Largely historical or colloquial use outside of body weight context.

Common Uses for carats

Jewelry Industry: The primary unit for weighing diamonds and other precious gemstones.
Pearls: Used for weighing pearls.
Note: This is distinct from "karat," which measures the purity of gold.

Frequently Asked Questions

Questions About Stone (st)

How many pounds are in a stone?

There are 14 pounds (lb) in 1 stone (st).

Is the stone used outside the UK and Ireland?

Its use is very limited outside the UK and Ireland, mainly for historical context or by people familiar with imperial body weight measurements.

Why is it called a stone?

The name originates from the historical practice of using stones of a standardized size as weight standards in trade.

About Carat (ct)

How many milligrams are in a carat?

There are exactly 200 milligrams (mg) in 1 carat (ct).

How many grams are in a carat?

There are 0.2 grams (g) in 1 carat (ct).

Is carat the same as karat?

No. Carat (ct) measures mass (weight) for gemstones, while Karat (K or kt) measures the purity of gold (e.g., 24K gold is pure gold).

Conversion Table: Stone to Carat

Stone (st)	Carat (ct)
1	31,751.466
5	158,757.33
10	317,514.659
25	793,786.648
50	1,587,573.295
100	3,175,146.59
500	15,875,732.95
1,000	31,751,465.9

All Weight Conversions

Kilogram to Gram Kilogram to Milligram Kilogram to Pound Kilogram to Ounce Kilogram to Stone Kilogram to Ton (metric)Kilogram to Ton (US)Kilogram to Ton (UK)Kilogram to Microgram Kilogram to Carat Kilogram to Slug Kilogram to Troy Ounce Kilogram to Pennyweight Kilogram to Grain Kilogram to Dram Kilogram to Quintal Kilogram to Atomic Mass Unit Kilogram to Pavan (India)Kilogram to Kati (India)Kilogram to Masha (India)Kilogram to Dina (India)Kilogram to Pras (India)Kilogram to Lota (India)Gram to Kilogram Gram to Milligram Gram to Pound Gram to Ounce Gram to Stone Gram to Ton (metric)Gram to Ton (US)Gram to Ton (UK)Gram to Microgram Gram to Carat Gram to Slug Gram to Troy Ounce Gram to Pennyweight Gram to Grain Gram to Dram Gram to Quintal Gram to Atomic Mass Unit Gram to Pavan (India)Gram to Kati (India)Gram to Masha (India)Gram to Dina (India)Gram to Pras (India)Gram to Lota (India)Milligram to Kilogram Milligram to Gram Milligram to Pound Milligram to Ounce Milligram to Stone Milligram to Ton (metric)Milligram to Ton (US)Milligram to Ton (UK)Milligram to Microgram Milligram to Carat Milligram to Slug Milligram to Troy Ounce Milligram to Pennyweight Milligram to Grain Milligram to Dram Milligram to Quintal Milligram to Atomic Mass Unit Milligram to Pavan (India)Milligram to Kati (India)Milligram to Masha (India)Milligram to Dina (India)Milligram to Pras (India)Milligram to Lota (India)Pound to Kilogram Pound to Gram Pound to Milligram Pound to Ounce Pound to Stone Pound to Ton (metric)Pound to Ton (US)Pound to Ton (UK)Pound to Microgram Pound to Carat Pound to Slug Pound to Troy Ounce Pound to Pennyweight Pound to Grain Pound to Dram Pound to Quintal Pound to Atomic Mass Unit Pound to Pavan (India)Pound to Kati (India)Pound to Masha (India)Pound to Dina (India)Pound to Pras (India)Pound to Lota (India)Ounce to Kilogram Ounce to Gram Ounce to Milligram Ounce to Pound Ounce to Stone Ounce to Ton (metric)Ounce to Ton (US)Ounce to Ton (UK)Ounce to Microgram Ounce to Carat Ounce to Slug Ounce to Troy Ounce Ounce to Pennyweight Ounce to Grain Ounce to Dram Ounce to Quintal Ounce to Atomic Mass Unit Ounce to Pavan (India)Ounce to Kati (India)Ounce to Masha (India)Ounce to Dina (India)Ounce to Pras (India)Ounce to Lota (India)Stone to Kilogram Stone to Gram Stone to Milligram Stone to Pound Stone to Ounce