Dwt to Oz Calculator: Convert Pennyweights to Ounces

This dwt to oz calculator converts a weight in pennyweights (dwt) into troy ounces (ozt), the ounce unit commonly used for precious metals. Enter the number of pennyweights to see the equivalent troy ounces, plus the equivalent grams.

Formula

There are 20 pennyweights in one troy ounce. Therefore, divide the number of pennyweights by 20 to get troy ounces:

troy ounces (ozt) = pennyweights (dwt) ÷ 20

To express the same weight in grams, multiply pennyweights by the standard conversion factor:

grams (g) = pennyweights (dwt) × 1.55517384

• dwt is the entered weight in pennyweights.
• ozt is the result in troy ounces.
• g is the result in grams.

The calculator rounds each displayed result to three decimal places. Its conversions use the troy system, not the ordinary avoirdupois ounce used for many everyday goods.

Worked Example

With the default input of 20 dwt:

1. Convert to troy ounces: 20 dwt ÷ 20 = 1.000 ozt.
2. Convert to grams: 20 dwt × 1.55517384 = 31.1034768 g, which rounds to 31.103 g.

So 20 pennyweights equals 1.000 troy ounce, or approximately 31.103 grams.

What Dwt and Ozt Mean

Dwt is the abbreviation for pennyweight, a unit in the troy weight system. The “d” comes from the old symbol for penny, while “wt” indicates weight. Although the name includes “penny,” a pennyweight is a measure of mass, not a count of coins or a currency amount.

A troy ounce is also a unit of mass, used especially when weighing precious metals. One troy ounce is 31.1034768 grams. The troy ounce is divided into 20 pennyweights, and each pennyweight is divided into 24 grains. These relationships make dwt a convenient unit for weights smaller than an ounce.

Troy Ounces vs. Ordinary Ounces

The most important detail when converting dwt is to use troy ounces (ozt). An ordinary ounce, also called an avoirdupois ounce, is about 28.3495 grams. A troy ounce is heavier, at about 31.1035 grams. The two units are not interchangeable.

For instance, 20 dwt equals 1 troy ounce, but it does not equal 1 ordinary ounce. In ordinary ounces, that same mass is approximately 1.097 ordinary ounces. When a listing or scale says only “oz,” check the context or documentation to determine which ounce it means. Precious-metal weights are commonly stated in troy ounces; everyday food and household weights generally use ordinary ounces.

How to Use the Conversion

Enter a nonnegative weight in pennyweights. The first result is the equivalent number of troy ounces; the second is the same mass in grams. The conversion is linear, so doubling the dwt input doubles both results.

• 10 dwt = 0.500 ozt = approximately 15.552 g.
• 5 dwt = 0.250 ozt = approximately 7.776 g.
• 1 dwt = 0.050 ozt = approximately 1.555 g.

To reverse the calculation, multiply troy ounces by 20 to get pennyweights. To convert grams to pennyweights, divide grams by 1.55517384. Keep the units attached to the values throughout the calculation, especially if comparing figures from different sources.

Accuracy, Rounding, and Limits

The conversion factors are fixed, but a displayed answer may be rounded. Three decimal places are useful for many ordinary comparisons, yet they do not imply that a scale measured the object to the nearest milligram or that its stated weight is exact. For a calculation requiring more precision, retain additional digits in the conversion and round only at the end.

This calculator converts units; it does not determine the purity, composition, or value of an item. A weight in dwt describes mass only. If you are comparing a metal item’s weight with a specification, make sure both measurements refer to the same material and unit system, and check whether any stated weight includes stones, settings, or other components.

Frequently Asked Questions

How many troy ounces are in one dwt?
One pennyweight is 0.05 troy ounces, because 20 dwt make 1 ozt.

How many grams is one dwt?
One pennyweight is approximately 1.55517384 grams. Rounded to three decimal places, that is 1.555 g.

Is dwt the same as a regular ounce?
No. Dwt converts to troy ounces, which are heavier than ordinary avoirdupois ounces. One troy ounce is about 31.1035 g; one ordinary ounce is about 28.3495 g.

How do I convert troy ounces back to dwt?
Multiply the number of troy ounces by 20. For example, 0.75 ozt × 20 = 15 dwt.

What does dwt stand for?
Dwt stands for pennyweight, a unit of mass in the troy system. It is often encountered in precious-metal weighing and related specifications.

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in dwt | Pennyweights | dwt | 20 | 0
out ozt | Troy ounces | ozt | dwt / 20 | 3
out g | Grams | g | dwt * 1.55517384 | 3