Troy Ounce to Pennyweight Converter

Mass Converter

26 units available

Decimals:

From

To

20

1 oz t = 20 dwt

Formula:

dwt = oz t × 20

With your value: 1 oz t = 20 dwt

How big is that?

Everyday references on a logarithmic scale, all expressed in troy ounce so you can sanity-check the result.

Paperclip (1/31 your value)0.0322 oz t

AA battery (1/1.3 your value)0.772 oz t

Your value1.00 oz t

Can of soda (13× your value)12.5 oz t

Bag of sugar (32× your value)32.2 oz t

House cat (1.4e+2× your value)145 oz t

Other Troy Ounce to Pennyweight conversions

2 oz t to dwt 3 oz t to dwt 4 oz t to dwt 5 oz t to dwt 6 oz t to dwt 7 oz t to dwt 8 oz t to dwt

Troy Ounce to Pennyweight Conversion Table

Troy Ounce (oz t)	Pennyweight (dwt)
0.5	10
1	20
2	40
5	100
10	200
15	300
20	400
25	500
50	1,000
100	2,000
250	5,000
500	10,000
1000	20,000

Pennyweight to Troy Ounce Conversion Table

Pennyweight (dwt)	Troy Ounce (oz t)
0.5	0.025
1	0.05
2	0.1
5	0.25
10	0.5
15	0.75
20	1
25	1.25
50	2.5
100	5
250	12.5
500	25
1000	50

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Troy Ounce (oz t)

Mass

Exact conversion

1 troy ounce = 480 grains = 0.031 103 476 8 kg exactly. Used for precious metals only.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Pennyweight (dwt)

Mass

Exact conversion

Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

How to Convert Troy Ounce to Pennyweight

To convert from Troy Ounce (oz t) to Pennyweight (dwt), multiply the value by 20.

Formula: dwt = oz t × 20

Reverse: oz t = dwt × 0.05

Step-by-Step Example

Start with your value in Troy Ounce. For example: 5 oz t
Multiply by the conversion factor: 5 x 20
The result is: 100 dwt

About Troy Ounce

The troy ounce equals approximately 31.1 grams and is used for weighing precious metals like gold, silver, and platinum.

Common uses: gold trading, silver markets, precious metals.

About Pennyweight

The pennyweight (dwt) equals 1/20 of a troy ounce, about 1.555 grams. Jewellers still price scrap gold by the pennyweight.

Common uses: jewellery trade, gold scrap, assaying.

Frequently Asked Questions

How many Pennyweight are in 1 Troy Ounce?

There are exactly 20 Pennyweight in 1 Troy Ounce. This means the conversion factor from Troy Ounce to Pennyweight is 20.

What is the formula to convert Troy Ounce to Pennyweight?

The formula to convert Troy Ounce to Pennyweight is: dwt = oz t × 20. For example, to convert 10 Troy Ounce to Pennyweight, you would multiply 10 by 20.

What is a Troy Ounce?