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Quantity Converter
Convert between each, dozen, gross, score, ream, pair and more.
A wholesale supplier lists eggs by the dozen, paper by the ream, and industrial fasteners by the gross, and none of those numbers is 10 or 100. Counting by twelves rather than tens predates the metric system by thousands of years, and large parts of commerce never fully switched over.
The counting units, defined
- Each — one single unit — the baseline every other quantity here is built from.
- Pair — two of something, almost always items that are used together, like shoes or gloves.
- Dozen — twelve units. The dominant counting unit in food, eggs and baking for at least two thousand years.
- Baker’s dozen — thirteen units. Supposedly originated with medieval English bakers adding an extra loaf to avoid the harsh penalties for selling underweight bread.
- Score — twenty units. Now mostly archaic in commerce, though it survives in phrases like “fourscore and seven years”.
- Gross — twelve dozen, or 144 units. Standard in wholesale hardware, stationery and small parts.
- Ream — 500 sheets of paper, historically 480 before an industry-wide standardisation in the early twentieth century.
Why twelve won out over ten for so long
A dozen divides evenly by 2, 3, 4 and 6. Ten only divides evenly by 2 and 5. For a market trader splitting a batch of eggs between several customers, or a merchant halving, quartering or thirding a shipment, base-12 counting is simply more practical than base-10 — which is exactly why it survived in commerce long after most measurement went metric.
The gross extends the same logic one level up: 144 items divide cleanly into dozens, halves, thirds, quarters and sixths, which made it the natural bulk unit for anyone selling small hardware, buttons, pencils or screws by the box.
Quantity units at a glance
| Unit | Equals | Typically used for |
|---|---|---|
| 1 pair | 2 each | Shoes, gloves, socks |
| 1 dozen | 12 each | Eggs, baked goods, flowers |
| 1 baker’s dozen | 13 each | Traditional bread and pastry orders |
| 1 score | 20 each | Historical and literary counting |
| 1 gross | 144 each | Hardware, stationery, small parts |
| 1 ream | 500 each | Sheets of paper |
Where these units still matter today
- Wholesale ordering: suppliers often set minimum order quantities in dozens or grosses rather than round decimal numbers.
- Inventory systems: retail stock counts for small parts are frequently tracked in gross units to match how they were purchased.
- Printing and office supply: paper is bought and billed by the ream almost universally, even in fully metric countries.
- Farmers’ markets and bakeries: eggs and baked goods are still sold by the dozen and half-dozen far more often than by any round number.
Quantity conversion questions
How many is a gross?
A gross is 144 units, equal to twelve dozen. It is the standard bulk-counting unit for small hardware and stationery items sold wholesale.
Why is a baker’s dozen thirteen instead of twelve?
The most widely repeated explanation traces to medieval England, where bakers faced severe fines or corporal punishment for selling underweight bread. Adding a free thirteenth loaf to every dozen sold gave them a buffer against accusations of shortchanging customers.
How many sheets are in a ream of paper?
The modern standard is 500 sheets. An older convention used 480 sheets (twenty-four quires of twenty), but the printing industry standardised on 500 in the early twentieth century, and that is what “ream” means on packaging today.
Is a score still used for anything practical?
Rarely in commerce today. It survives mainly in historical texts, some legal documents, and set phrases, but almost no modern supplier or retailer quotes quantities in scores.
How do I convert a quantity in dozens to individual units?
Multiply the number of dozens by 12. Three and a half dozen eggs is 3.5 × 12 = 42 eggs. Going the other direction, divide the individual count by 12 to get dozens.
