Free Quantity Converter

Quantity Converter: Dozens, Scores, Grosses, and More

Need to convert between traditional quantity units like the dozen, score, or gross? This quantity converter handles nine separate measures, from the smallest grouping (a couple, 2 items) up to the great gross (1,728 items). This article explains the meaning behind each unit, their historical origins, and how to operate the converter.

The Dozen: Base Unit of Duodecimal Counting

A dozen equals 12 items. It is one of the oldest known grouping systems, dating back to Mesopotamia. The number 12 was practical because it can be evenly divided by 1, 2, 3, 4, 6, and 12 — more divisors than 10 for similar‑sized bundles. Half a dozen (6) and a couple (2) are derived directly from this base.

Baker's Dozen: Why 13?

A baker's dozen is 13 items. The custom arose in medieval England, where bakers risked heavy penalties if they sold underweight bread. Since loaves varied in size and weight, bakers would add an extra piece to a dozen to ensure compliance. Occasionally they might add even more, but the standard settled on 13. Today you still encounter baker's dozens in donut shops and bakeries.

Score, Gross, and Great Gross

• Score (20 items): The term comes from cutting notches in a tally stick. It remains famous from the Gettysburg Address ("four score and seven years ago").
• Gross (144 items, $12^{2}$): Twelve dozen. The word originates from the French "grosse douzaine" (large dozen). Used for wholesale counting of pens, buttons, or screws.
• Great Gross (1,728 items, $12^{3}$): Twelve gross. Useful when tallying very large batches of small merchandise.

Quick Reference Table

The following table summarizes the main quantity units and how many items they represent:

Number of Items	Unit Name
2	a couple / a pair / a brace
6	half a dozen
12	a dozen
13	a baker's dozen
20	a score
144	a gross (12 dozen)
1,728	a great gross (12 gross)

Common Conversions at a Glance

• 1 gross = 12 dozen = 144 items
• 1 great gross = 12 gross = 144 dozen = 1,728 items
• 1 score = 20 items → a dozen equals 0.6 score
• A baker's dozen is one more than a regular dozen (13 vs. 12)

Using the Quantity Converter

Using the tool requires no learning curve. Click into the input field for any unit — for example, type "25" beside "scores." The calculator instantly updates all other fields, showing the equivalent amounts in dozens, grosses, items, and so on. The same process works in reverse: enter an item count and read the result in your target unit.

A practical example: 25 scores at 20 items each gives 500 items total. Because a dozen contains 12 items, 500 ÷ 12 equals approximately 41.7 dozen. The converter performs this math instantaneously.

Whether you are a student studying pre‑decimal units, a chef scaling a recipe, a collector assessing button or bead stocks, or simply curious about historical measurement, this converter gives you accurate conversions in seconds.