# Scruples to Ounces (s ap to oz)

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

**1 s ap = 0.045714285714286 oz**

One scruple equals approximately 0.04571 avoirdupois ounces, meaning roughly 21.88 scruples make one avoirdupois ounce. This conversion crosses from the apothecary system to the avoirdupois system, connecting pharmaceutical dosing history with everyday weight measurement.

## Formula

Apply the conversion factor

## Conversion Table

| Scruples (s ap) | Ounces (oz) |
|---|---|
| 1 s ap | 0.045714285714286 oz |
| 3 s ap | 0.13714285714286 oz |
| 5 s ap | 0.22857142857143 oz |
| 10 s ap | 0.45714285714286 oz |
| 20 s ap | 0.91428571428571 oz |
| 24 s ap | 1.0971428571429 oz |
| 50 s ap | 2.2857142857143 oz |
| 100 s ap | 4.5714285714286 oz |
| 200 s ap | 9.1428571428571 oz |
| 288 s ap | 13.165714285714 oz |
| 500 s ap | 22.857142857143 oz |
| 1000 s ap | 45.714285714286 oz |
| 5000 s ap | 228.57142857143 oz |

## Units

### Scruple (s ap)

An apothecary scruple equals 20 grains or 1/3 of a dram apothecary (1.2959782 grams). A historical pharmaceutical unit largely replaced by metric measurements.

### 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.

## Background

Pharmacists transitioning from apothecary to avoirdupois weights during the 19th century needed this conversion when bulk ingredients were purchased in avoirdupois ounces but prescriptions were written in scruples. Historical records from this transition period show both units on the same documents.

## Good to Know

The scruple-to-avoirdupois-ounce conversion was a daily reality for 19th-century pharmacists navigating between two weight systems. The apothecary system governed their training and prescriptions; the avoirdupois system governed their purchasing. Living in both worlds simultaneously required fluent cross-system arithmetic that modern pharmacists, working exclusively in metric, no longer need.

## FAQ

### How many avoirdupois ounces are in one scruple?

One scruple equals approximately 0.04571 avoirdupois ounces. About 21.88 scruples make one avoirdupois ounce. This crosses between the apothecary and avoirdupois weight systems.

### How do I convert scruples to ounces?

Multiply scruples by 0.04571. For example, 10 scruples equals about 0.457 ounces. For quick estimation, divide scruples by 22 for approximate ounces.

### Is the apothecary ounce different from the avoirdupois ounce?

Yes. An apothecary ounce equals a troy ounce (31.10 g), while an avoirdupois ounce is 28.35 g. The apothecary ounce contains 24 scruples; an avoirdupois ounce contains about 21.88 scruples. Same name, different weight, different internal structure.

## Non-Frequently Asked Questions

### If I weigh my breakfast cereal in scruples and the box says ounces, who wins?

The box wins in practical terms: it uses avoirdupois ounces that your kitchen scale understands. A single serving of cereal at 1 ounce equals about 21.9 scruples, which sounds like a lot more cereal than it actually is. Marketing departments have not yet exploited this unit inflation opportunity.

### How many scruples is a shot of espresso?

A standard espresso shot weighs about 1 ounce (28.35 grams), which equals approximately 21.9 scruples. Your morning espresso is roughly 22 scruples of caffeinated liquid, which a Victorian pharmacist would have considered a dangerously large dose of stimulant, since caffeine in scruple quantities is indeed pharmacologically significant.

### Would an apothecary recognize an avoirdupois ounce?

A trained apothecary would immediately notice the difference, since an apothecary ounce (31.10 g) is about 10 percent heavier than an avoirdupois ounce (28.35 g). Using the wrong ounce in pharmacy could produce a 10 percent dosing error, which for potent drugs could be the difference between treatment and toxicity. This is exactly why the metric system was so welcome in pharmacy.

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## See Also

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