Ounce to Pennyweight Converter

Mass Converter

26 units available

Decimals:

From

To

18.229167

1 oz = 18.229167 dwt

Formula:

dwt = oz × 18.2291666667

With your value: 1 oz = 18.22916667 dwt

How big is that?

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

Paperclip (1/28 your value)0.0353 oz

AA battery (1/1.2 your value)0.847 oz

Your value1.00 oz

Can of soda (14× your value)13.8 oz

Bag of sugar (35× your value)35.3 oz

House cat (1.6e+2× your value)159 oz

Other Ounce to Pennyweight conversions

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

Ounce to Pennyweight Conversion Table

Ounce (oz)	Pennyweight (dwt)
0.5	9.114583
1	18.229167
2	36.458333
5	91.145833
10	182.291667
15	273.4375
20	364.583333
25	455.729167
50	911.458333
100	1,822.916667
250	4,557.291667
500	9,114.583333
1000	18,229.166667

Pennyweight to Ounce Conversion Table

Pennyweight (dwt)	Ounce (oz)
0.5	0.027429
1	0.054857
2	0.109714
5	0.274286
10	0.548571
15	0.822857
20	1.097143
25	1.371429
50	2.742857
100	5.485714
250	13.714286
500	27.428571
1000	54.857143

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.

Ounce (oz)

Mass

Exact conversion

1 avoirdupois ounce = 1/16 lb = 0.028 349 523 125 kg exactly.

Source: International Yard and Pound Agreement of 1959; NIST Federal Register Notice 59-5442

US, UK, Canada, Australia, New Zealand, South Africa · 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 Ounce to Pennyweight

To convert from Ounce (oz) to Pennyweight (dwt), multiply the value by 18.2291666667.

Formula: dwt = oz × 18.2291666667

Reverse: oz = dwt × 0.0548571429

Step-by-Step Example

Start with your value in Ounce. For example: 5 oz
Multiply by the conversion factor: 5 x 18.2291666667
The result is: 91.145833 dwt

About Ounce

The ounce (oz) equals 1/16 of a pound or approximately 28.35 grams. It is used for food portions and small weight measurements.

Common uses: food portions, postal mail, 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 Ounce?

There are exactly 18.2291666667 Pennyweight in 1 Ounce. This means the conversion factor from Ounce to Pennyweight is 18.2291666667.

What is the formula to convert Ounce to Pennyweight?

The formula to convert Ounce to Pennyweight is: dwt = oz × 18.2291666667. For example, to convert 10 Ounce to Pennyweight, you would multiply 10 by 18.2291666667.

What is a Ounce?