A slug is an imperial mass unit.
Slugs to Ounces Converter — slug to oz
Convert Slug (slug) to Ounce (oz) using the exact conversion factor (1 slug = 514.7847769 ounce). See the formula, worked examples, conversion table, history, and common uses.
Slugs to Ounces converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
An avoirdupois ounce is 1/16 pound.
Result = input x 14.59390294 / 0.02834952313.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Slugs to Ounces
Weight conversions between Slug and Ounce come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A slug is an imperial mass unit, and an avoirdupois ounce is 1/16 pound.
Formula
ounces = slugs × 514.784776903
This factor comes from each unit's defined relationship to the category's base unit: 1 slug equals 14.5939029372 base units, and 1 ounce equals 0.028349523125 base units, so dividing one by the other gives the direct slug-to-ounce factor of 514.784776903.
Simple example
1 slug × 514.7847769 = 514.7847769 oz
1 slug = 514.7847769 ounces.
Real-world example
50 slug × 514.7847769 = 25,739.23885 oz
50 slugs = 25,739.23885 ounces.
Conversion table
| Slug (slug) | Ounce (oz) |
|---|---|
| 1 slug | 514.7847769 oz |
| 5 slug | 2,573.923885 oz |
| 10 slug | 5,147.847769 oz |
| 25 slug | 12,869.61942 oz |
| 50 slug | 25,739.23885 oz |
| 100 slug | 51,478.47769 oz |
Reverse conversion: Ounce to Slug
514.7847769 oz × 0.001942559386 = 1 slug
514.7847769 ounces = 1 slugs.
slugs = ounces × 0.00194255938572
For a page dedicated to this direction, see Ounce to Slug.
Understanding the Slug (slug)
A slug is an imperial mass unit.
Understanding the Ounce
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Where it's used: United States (cooking, postal, retail) United Kingdom (informal/retail use)
Avoirdupois ounce vs. troy ounce. The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.
Uses of the Ounce today
- US cooking and recipe measurement (small quantities)
- US postal and shipping weight
- Precious metals (troy ounce, a related but distinct unit)
History of the Ounce
The ounce descends from the Roman 'uncia' (a twelfth part), inherited through medieval English weight systems; the avoirdupois ounce (for general goods, as opposed to the troy ounce for precious metals) became standard for everyday trade, fixed at exactly 28.349523125 g via the pound's 1959 international standardization.
Historical origin. Ounce was not the invention of a single named person; it developed through the process described above.
Ounce — sources
- NIST — International yard and pound (1959) — Basis for the modern ounce via the standardized pound.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ounces are in 1 slug?
1 slug equals 514.7847769 ounces, using the exact defined conversion factor rather than an estimate.
How do I convert slug to ounce?
Multiply the slug value by 514.7847769. The converter above does this instantly to whatever precision you set.
How do I convert ounce back to slug?
Use the reverse factor: 1 ounce equals 0.0019425594 slugs. You can also use the swap control in the converter above to flip the direction instantly.
What is a slug?
Slug (slug) is a unit of mass/weight.
What is a ounce?
Ounce (oz) measures mass. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. It is classified as a US/imperial customary unit.
Is the slug to ounce conversion exact?
Yes. The avoirdupois ounce is 1/16 of a pound: exactly 28.349523125 grams. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between avoirdupois ounce vs. troy ounce?
The everyday ounce (avoirdupois, 28.35 g) used for cooking and shipping is a different, smaller unit than the troy ounce (31.10 g) used for precious metals like gold and silver — this page uses the everyday avoirdupois ounce.