# Pounds to Scruples (lbs to s ap)

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

**1 lbs = 350 s ap**

One avoirdupois pound equals approximately 350 scruples. The scruple, an apothecary unit of 20 grains (about 1.296 grams), was historically used for pharmaceutical compounding. Converting pounds to scruples connects the everyday weight system with the now largely obsolete apothecary tradition, mainly relevant for historical pharmaceutical research.

## Formula

Apply the conversion factor

## Conversion Table

| Pounds (lbs) | Scruples (s ap) |
|---|---|
| 0.1 lbs | 35 s ap |
| 0.25 lbs | 87.5 s ap |
| 0.5 lbs | 175 s ap |
| 1 lbs | 350 s ap |
| 2 lbs | 700 s ap |
| 5 lbs | 1750 s ap |
| 10 lbs | 3500 s ap |
| 25 lbs | 8750 s ap |
| 50 lbs | 17500 s ap |
| 100 lbs | 35000 s ap |
| 200 lbs | 70000 s ap |
| 500 lbs | 175000 s ap |
| 1000 lbs | 350000 s ap |

## Units

### Pound (lbs)

An imperial and US customary unit of mass equal to approximately 453.6 grams or 16 ounces. Widely used in the US and UK for body weight and commerce.

### 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.

## Background

Pre-metric pharmacy manuals list bulk drug ingredient purchases in pounds and individual prescription quantities in scruples. An 18th-century apothecary buying a pound of dried belladonna root would know it contained roughly 350 scruples' worth of raw material for compounding. Historical medical texts and poison studies reference dosages in scruples that modern toxicologists convert to metric units via the pound as an intermediate step.

## Good to Know

The pound-to-scruple conversion chain was the backbone of pre-metric pharmacy. An apothecary's entire inventory management, from bulk purchasing to individual prescription filling, depended on fluent conversion between these units. The pharmacist's skill in subdividing pounds into scruples accurately was literally a matter of life and death, as errors could produce lethal overdoses or ineffective underdoses.

## FAQ

### How many scruples are in one pound?

One avoirdupois pound contains approximately 350 scruples. This crosses from the avoirdupois system to the apothecary system, since the scruple (1.296 grams) and the pound (453.592 grams) belong to different weight traditions.

### What is the scruple used for?

The scruple was the standard small unit in apothecary pharmacy, used to measure drug ingredients before the metric system replaced it. Three scruples make one apothecary dram, and 24 scruples make one apothecary ounce. It is now essentially obsolete in modern pharmacy.

### How do I convert pounds to scruples?

Multiply pounds by 350. For example, half a pound equals about 175 scruples. The calculation divides the pound's gram value (453.592) by the scruple's gram value (1.296).

## Non-Frequently Asked Questions

### If I have 350 scruples, does that make me a very conscientious person?

In the apothecary sense, 350 scruples makes you one pound of pharmaceutical ingredients. In the moral sense, 350 scruples would make you so conscientious that you would agonize over the ethics of jaywalking on a deserted island. Most people operate with considerably fewer moral scruples and somehow manage to function in society.

### Did anyone ever buy drugs by the pound and dose them by the scruple?

This was exactly how apothecary pharmacy worked for centuries. A pharmacist would purchase raw ingredients in bulk (pounds or larger) and subdivide them into individual doses measured in scruples or grains using precision balance scales. The entire profession of compounding pharmacy was built on this bulk-to-dose conversion chain.

### Is 350 a satisfying number of scruples per pound?

Not particularly. The number 350 arises from dividing two independently defined units and lacks the clean elegance of ratios like 16 ounces per pound or 24 grains per pennyweight. It is an inter-system conversion factor, and inter-system factors rarely produce round numbers. The imperial measurement world was not designed with aesthetic consistency in mind.

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## See Also

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