Why Is a Baker’s Dozen 13?
Ever wondered why a baker's dozen contains 13 instead of 12?
The answer may lie in medieval England, where selling bread could be a surprisingly serious business!
But first, why do we use the number 12 so often?
A dozen is a group of 12, a particularly handy number because it can be divided evenly by 2, 3, 4 and 6.
And its influence is everywhere:
12 hours on a traditional clock face.
12 months in a year.
12 inches in a foot.
12 eggs in a dozen.
12 old pennies in a shilling.
But the baker's dozen takes things one step further.
THE MEDIEVAL BAKER'S DILEMMA
Let's travel back to 12th-century England.
During the reign of Henry II, regulations began emerging to control the price, weight and quality of bread.
These became known as the Assize of Bread, with later versions refining the rules.
The principle was straightforward. The weight of a loaf had to reflect the price of wheat, helping protect customers from being overcharged or short-changed.
And bakers who broke the rules could face fines and, for serious or repeated offences, even the pillory!
Imagine trying to run a bakery under those conditions.
A loaf that was even slightly underweight could potentially land you in trouble.
AND HERE COMES THE EXTRA LOAF!
One widely accepted explanation for the baker's dozen is that bakers began adding an extra loaf when supplying a dozen.
Why?
That additional loaf provided a safety margin, helping ensure the total quantity supplied met the required weight.
It was a practical way of reducing the risk of penalties while keeping customers satisfied.
There was also another possible commercial reason. Some accounts suggest that an extra loaf helped middlemen who purchased bread for resale, allowing them to make a profit without increasing the regulated selling price.
However, there is an important historical detail.
Although medieval bread regulations are well documented, surviving evidence does not conclusively establish exactly when or how the extra-loaf custom began.
The explanation is plausible and widely repeated, but its precise origins remain uncertain.
WHEN DID THE EXPRESSION APPEAR?
Interestingly, the expression baker's dozen appears in English writing by 1596.
Thomas Nashe used the phrase in his work Have With You to Saffron-Walden, although not in a straightforward description of buying bread.
John Cooke's play Greene's Tu Quoque, published in 1614, also uses the expression, this time in a gambling context.
These early references show that the expression was already familiar enough to be understood by readers and audiences.
By then, the baker's dozen was more than just a possible solution to a medieval baking problem. It had become part of everyday language.
So, the next time someone offers a baker's dozen, remember that the extra item may have a centuries-old connection to the rules governing medieval bread.
And what began as a possible safeguard against short-weight loaves became a familiar expression that has survived for generations.
12 plus one for good measure!
SOURCES AND FURTHER READING
Fordham University — The Assizes of Bread, Beer, & Lucrum Pistoris (historical text and background to medieval bread regulations).
Fordham University — Judicium Pillorie (The Judgment of the Pillory) (historical evidence concerning enforcement and penalties).
Wordorigins.org — Baker's Dozen (historical usage, early written examples and discussion of the proposed origins).
James Davis — Baking for the Common Good: A Reassessment of the Assize of Bread in Medieval England, The Economic History Review, Vol. 57, No. 3, pp. 465–502.
Gwen Seabourne — Assize Matters: Regulation of the Price of Bread in Medieval London, The Journal of Legal History, Vol. 27, No. 1, pp. 29–52.
A note on our visuals: To ℎelp bring tℎis story to life, we've used an artistic illustration. Wℎile we've aimed for ℎistorical accuracy, it may contain errors or artistic interpretation. It is used solely for educational, non-commercial ℎistory storytelling.
