Carat to Pennyweight Conversion Calculator: Free Online Tool

Convert carats to pennyweights with our free online weight converter.

From:

Carat

To:

Pennyweight

How to Use the Calculator:

Enter the value you want to convert in the 'From' field (Carat).
The converted value in Pennyweight 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 Carat to Pennyweight

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

Formula:

1 Carat = 0.128603 pennyweights

Example Calculation:

Convert 5 carats: 5 × 0.128603 = 0.643015 pennyweights

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 Carat and a Pennyweight?

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

The pennyweight (dwt) is a unit of mass in the troy weight system. It is equal to 1/20 of a troy ounce, or 24 grains. It is equivalent to exactly 1.55517384 grams.

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

History of the Carat and Pennyweight

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.

Historically, the pennyweight was the weight of a silver penny in medieval England. It became part of the standardized troy system used for precious metals and coinage.

Common Uses for carats and pennyweights

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

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.

Common Uses for pennyweights

Jewelry: Used by jewelers and goldsmiths for measuring quantities of precious metals during crafting and valuation.
Dentistry: Sometimes used for measuring dental alloys.
Ammunition: Historically used for specifying the weight of components in ammunition.

Frequently Asked Questions

Questions 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).

About Pennyweight (dwt)

How many pennyweights are in a troy ounce?

There are 20 pennyweights (dwt) in 1 troy ounce (oz t).

How many grains are in a pennyweight?

There are 24 grains (gr) in 1 pennyweight (dwt).

How many grams are in a pennyweight?

There are exactly 1.55517384 grams (g) in 1 pennyweight (dwt).

Conversion Table: Carat to Pennyweight

Carat (ct)	Pennyweight (dwt)
1	0.129
5	0.643
10	1.286
25	3.215
50	6.43
100	12.86
500	64.302
1,000	128.603

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