# Ounces to Slugs (oz to slug)

Source: https://www.unitconvertercalculator.com/weight/ounces-to-slugs/

**1 oz = 0.0019425593773646 slug**

One ounce equals approximately 0.00194 slugs. The slug is a unit of mass in the imperial system used primarily in physics and engineering, defined as the mass that is accelerated by 1 foot per second squared when a force of one pound-force is exerted on it. One slug weighs approximately 32.174 pounds or 514.785 ounces under standard gravity.

## Formula

Apply the conversion factor

## Conversion Table

| Ounces (oz) | Slugs (slug) |
|---|---|
| 1 oz | 0.0019425593773646 slug |
| 4 oz | 0.0077702375094586 slug |
| 8 oz | 0.015540475018917 slug |
| 16 oz | 0.031080950037834 slug |
| 32 oz | 0.062161900075669 slug |
| 64 oz | 0.12432380015134 slug |
| 100 oz | 0.19425593773646 slug |
| 128 oz | 0.24864760030267 slug |
| 256 oz | 0.49729520060535 slug |
| 500 oz | 0.97127968868232 slug |
| 1000 oz | 1.9425593773646 slug |
| 5000 oz | 9.7127968868232 slug |
| 10000 oz | 19.425593773646 slug |

## Units

### Ounce (oz)

An imperial and US customary unit of mass equal to approximately 28.35 grams. Commonly used in the US and UK for food and postal weight.

### Slug (slug)

A slug is a unit of mass in the imperial system used in physics and engineering. It equals approximately 14.593903 kilograms, derived from the pound-force, standard gravity, and the foot.

## Background

Aerospace engineers use slugs in calculations involving Newton's second law within the imperial unit framework. Structural engineers computing dynamic loads on buildings during earthquakes or wind events may encounter slugs in older American engineering textbooks and standards. The slug bridges the gap between force (pounds-force) and mass in a system where pounds ambiguously refer to both, which is precisely why the slug was invented.

## Good to Know

The slug was formalized as an engineering unit in the early 20th century to resolve the pound's dual identity as both mass and force. British physicist Arthur Mason Worthington is often credited with popularizing the term. Despite its practical necessity, the slug never entered everyday vocabulary, remaining confined to physics classrooms and engineering offices where its awkward name continues to amuse students.

## FAQ

### How many ounces are in one slug?

One slug weighs approximately 514.785 ounces under standard gravity. This comes from 1 slug equaling about 32.174 pounds, multiplied by 16 ounces per pound. The slug is defined through Newton's second law rather than as a fixed weight.

### Why does the imperial system need the slug?

The slug exists because 'pound' in everyday English refers to both mass and force, creating a fundamental ambiguity in engineering calculations. The slug provides a distinct unit of mass (as opposed to pound-force) so that F = ma calculations work correctly in the foot-pound-second system.

### Do any industries still use slugs?

Slugs appear in American aerospace engineering, certain mechanical engineering courses, and legacy engineering standards. NASA and defense contractors have historically used slugs in flight dynamics calculations, though many organizations have transitioned to SI units. The slug remains in older reference texts and some specialized software.

## Non-Frequently Asked Questions

### Is the slug named after the garden creature?

Not directly, though both convey a sense of sluggishness. The physics slug gets its name from the concept of 'sluggish' mass resisting acceleration. A garden slug weighs roughly 0.3 to 0.5 ounces, which is about 0.0006 to 0.001 physics slugs. So a slug is nowhere near a slug.

### If I weigh 150 pounds, how many slugs am I?

You are approximately 4.66 slugs, which is far less flattering than 150 pounds and significantly less intuitive than 68 kilograms. This is partly why the slug never caught on for everyday use. Nobody wants to step on a bathroom scale and see '4.66 slugs' staring back at them.

### Why is the slug the least popular unit in physics?

The slug suffers from an unappealing name, an unintuitive magnitude, and the fact that the metric system handles mass-force distinctions more gracefully with kilograms and newtons. Physics students worldwide groan when they encounter the slug, and it has inspired more confused exam answers than perhaps any other unit in engineering history.

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## See Also

- [Slugs to Ounces](https://www.unitconvertercalculator.com/weight/slugs-to-ounces/)