Carats (ct)	Pennyweights (dwt)
1 ct	0.1286 dwt
2 ct	0.2572 dwt
5 ct	0.643 dwt
10 ct	1.286 dwt
25 ct	3.2151 dwt
50 ct	6.4301 dwt
100 ct	12.8603 dwt
250 ct	32.1507 dwt
500 ct	64.3015 dwt
1000 ct	128.603 dwt

Convert Carats to Pennyweights

Convert carats to pennyweights (ct to dwt) with our instant calculator. 1 ct = 0.128603 dwt. Includes exact formula and reference tables.

How to Convert Carats to Pennyweights (ct to dwt)

1 Carat (ct) is equal to 0.128603 Pennyweights (dwt). Multiply the carat value by 0.1286029863

Quick Answer 1 ct = 0.128603 dwt

Formula dwt = ct × 0.1286029863

Inverse Factor 1 dwt = 7.775869 ct

Unit Definitions & Metrology Context

The standard SI base unit of mass is the kilogram (kg), defined in terms of the Planck constant (h = 6.62607015 × 10⁻³⁴ J⋅s).

About Carats (ct): Carat (ct) is a unit in the Weight & Mass measurement category. It is widely used in diamonds & gemstones. Relative to the weight & mass base unit, 1 ct equals 0.0002 Kilograms (kg).

About Pennyweights (dwt): Pennyweight (dwt) is a unit in the Weight & Mass measurement category. It is widely used in scrap gold & dental alloys (1.555 g). Relative to the weight & mass base unit, 1 dwt equals 0.001555 Kilograms (kg).

Need to convert in the opposite direction? Visit our Convert Pennyweights to Carats (dwt to ct) calculator (1 dwt = 7.775869 ct).

Step-by-Step Worked Examples (ct to dwt)

Convert 5 Carats to Pennyweights: Applying the formula (dwt = ct × 0.1286029863): starting with 5 ct, multiply the carat value by 0.1286029863 to get 0.643 dwt.
Convert 10 Carats to Pennyweights: Applying the formula (dwt = ct × 0.1286029863): starting with 10 ct, multiply the carat value by 0.1286029863 to get 1.286 dwt.
Convert 50 Carats to Pennyweights: Applying the formula (dwt = ct × 0.1286029863): starting with 50 ct, multiply the carat value by 0.1286029863 to get 6.4301 dwt.

Popular Weight & Mass Conversions

Pound ⇄ Kilogram

1 avoirdupois pound is legally defined as exactly 0.45359237 kilograms.

Ounce ⇄ Gram

1 ounce is approximately 28.3495 grams (1/16 of a pound).

Stone ⇄ Pound

1 British stone is exactly equal to 14 pounds (approx. 6.35029 kg).

Kilogram ⇄ Gram

1 kilogram equals exactly 1,000 grams.

Frequently Asked Questions

Verified answers and formulas for converting carats to pennyweights.

How many pennyweights are in 1 carat?

There are 0.128603 pennyweights (dwt) in 1 carat (ct). Conversely, 1 pennyweight equals 7.775869 carats.

How do you convert carats to pennyweights?

To convert carats (ct) to pennyweights (dwt), use the formula: dwt = ct × 0.1286029863. Multiply the carat value by 0.1286029863. For example, 10 ct equals 1.286 dwt.

How do I convert back from pennyweights to carats?

To convert in the reverse direction from pennyweights (dwt) to carats (ct), use the inverse formula: ct = dwt × 7.7758692. Multiply the pennyweight value by 7.7758692 (1 dwt = 7.775869 ct).

What is the difference between carat (ct) and pennyweight (dwt)?

Both carat and pennyweight measure weight & mass. Carat (ct) is a unit in the Weight & Mass measurement category. It is widely used in diamonds & gemstones. Relative to the weight & mass base unit, 1 ct equals 0.0002 Kilograms (kg). Pennyweight (dwt) is a unit in the Weight & Mass measurement category. It is widely used in scrap gold & dental alloys (1.555 g). Relative to the weight & mass base unit, 1 dwt equals 0.001555 Kilograms (kg).

How many pounds are in 1 kilogram?

1 kilogram equals approximately 2.20462 pounds. A quick mental trick is to multiply kilograms by 2.2.