How many carats are in one stone?

One stone equals 6,350.29318 grams. Since one carat is exactly 0.2 grams, there are 31,751.5 carats in one stone.

Is a "carat" the same as a "karat"?

No. A carat (ct) is a unit of mass equal to 0.2 grams, used for gemstones and pearls. A karat (k or kt) is a measure of gold purity (24 karat = pure gold). This tool uses mass carats only.

What is a stone in weight?

A stone is a unit of mass used mainly in the United Kingdom and Ireland, equal to 14 pounds or approximately 6.35 kilograms. It is not used in most other countries.

Why would I need to convert carats to stones?

Bulk gem lots, antique jewelry documents, or cross-border trade documents sometimes mix carat and imperial measurements. This converter lets you reconcile those figures quickly.

How accurate is this conversion?

The conversion uses the exact definition: 1 carat = 0.2 g and 1 stone = 6,350.29318 g (14 lb × 453.59237 g/lb). Results are accurate to 6 decimal places.

Carats to Stones Converter

Enter a weight in carats and instantly get the equivalent in stones and pounds.

Enter Weight in Carats

Carats (ct)

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Conversion Results

Enter a value in carats to see the result.

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Summary

The Carats to Stones Converter lets you quickly translate gemstone or precious-metal weights from carats (ct) — the standard unit used in jewelry — into stones (st) and pounds (lb), the imperial units common in everyday weighing. One carat equals exactly 0.2 grams, and one stone equals 6,350.29318 grams, making the math non-obvious without a calculator. This tool handles the conversion instantly in your browser with no server calls.

How it works

Enter the weight in carats into the input field.
The converter calculates grams from carats (1 ct = 0.2 g).
Grams are divided by 6,350.29318 to get the stones value.
The remaining fractional stone is multiplied by 14 to show extra pounds.
Results update live as you type — no button needed.

Use cases

Convert gemstone weights from carats to stones for bulk shipment manifests.
Compare diamond or ruby weights across metric and imperial specifications.
Understand the real-world "feel" of a large gem weight in everyday units.
Cross-check supplier invoices that mix carat and stone measurements.
Educational tool for jewelers and gemology students learning unit conversions.
Quick reference for customs declarations requiring imperial weight units.

Frequently Asked Questions

Last updated: 2026-10-05 · Reviewed by Nham Vu