21 Troy Ounce to Pennyweight
Quick answer
21 Troy Ounce (oz t) equals
420 dwt
To convert 21 Troy Ounces to Pennyweights, multiply by 20. Therefore, 21 Troy Ounce (oz t) equals 420 Pennyweight (dwt).
Formula: dwt = oz t × 20. Calculation: 21 × 20 = 420 dwt.
Convert Troy Ounce (oz t) to Pennyweight (dwt) online with our free unit converter. In mass, 1 oz t = 20 dwt. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Troy Ounce to Pennyweight
- Step 1 — start with the formula. dwt = oz t × 20
- Step 2 — substitute your figure. 21 oz t × 20
- Step 3 — read the result. 21 oz t = 420 dwt
- Step 4 — check it in reverse. oz t = dwt × 0.05 returns 21 oz t, which matches the figure you started with.
Mass Converter
26 units available
21 oz t = 420 dwt
Formula:
dwt = oz t × 20With your value: 21 oz t = 420 dwt
How big is that?
Everyday references on a logarithmic scale, all expressed in troy ounce so you can sanity-check the result.
Other Troy Ounce to Pennyweight conversions
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
1 troy ounce = 480 grains = 0.031 103 476 8 kg exactly. Used for precious metals only.
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Pennyweight (dwt)
Mass
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
Troy Ounce and Pennyweight Relationship
This calculation facilitates standardized conversion between recognized units of mass. Since 1 Troy Ounce equals approximately 20 Pennyweights, the Troy Ounce represents a larger unit interval than the Pennyweight. Understanding the relationship between Troy Ounce and Pennyweight is essential for accurate calculations in physics, engineering, commerce, and daily applications.
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 of Troy Ounce: 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 of Pennyweight: jewellery trade, gold scrap, assaying.
Frequently Asked Questions
- What is 21 Troy Ounce in Pennyweight?
- 21 Troy Ounce equals 420 Pennyweight.
- How many Pennyweights are in 1 Troy Ounce?
- There are exactly 20 Pennyweights 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 Ounces to Pennyweights, you would multiply 10 by 20.
- What is a Troy Ounce?
- The troy ounce equals approximately 31.1 grams and is used for weighing precious metals like gold, silver, and platinum.
- What is a Pennyweight?
- The pennyweight (dwt) equals 1/20 of a troy ounce, about 1.555 grams. Jewellers still price scrap gold by the pennyweight.
- What are the common uses of Troy Ounce?
- The Troy Ounce is commonly used in gold trading, silver markets, precious metals.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). 21 Troy Ounce to Pennyweight. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/21-troy_ounce-to-pennyweight