The Sword and Laser discussion
Units of Measure in Fantasy
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Mike
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Dec 08, 2011 03:30PM

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Like when you're reading a book set in the middle ages and they say to meet at 4 o'clock, as if everybody wears a watch.
It seems weird to me, but I think I'd be even more confused/out of the story if they used a made-up unit of measure that I had to try to figure out how it related to things I know.

When I come across 'it was 20 stones high' I gloss over it and assume it doesn't matter.

Why does the author need to stick to English phonology? As long as all the words from a single culture have a consistent phonology, I see no reason why a made up country can't be called Tsutladanoi.
I would rather the author used units that are used today (Metric or Imperial) instead of a made up system. I don't want to make conversions.
In some cases the structure of the world may necessitate made up systems. For example, Alien worlds wouldn't have time periods that mirrored our Earth based time measurements.
As far as which system is best. I find that the Imperial System works best for Fantasy and the Metric System works best for Sci-Fi.
I would find metric measurements in historical fantasy out of place and I find Imperial measurements in a futuristic setting just doesn't seem right.
The weight unit of a stone is still in current use and is a precise weight (It is 14 pounds).
A lot of older Australian still use Imperial measurements instead of/ or as well as the metric system.
We rarely used the American standard of referring to our weight in pounds only.
Someone who is 200 pounds here would have (and some still do) referred to their weight in Imperial units as 14 Stone 4 pounds.
I don't worry too much about the phonology of made up worlds. English is such a bastardised language that certain groups of letters can have multiple pronunciations.
-ough has at least 10 different pronunciations, more if you include place names and surnames.
There isn't even one single set of rules for English spelling and pronunciation.
In English speaking countries we each spell and pronounce certain words differently.
I use gaol, catalogue, draught, programme and cheque.
You may use jail, catalog, draft, program and check.
I pronounce Lieutenant as lef-tenant instead of loo-tenant.
Our language has been shaped and influenced by the languages of the invaders of Britain (which were in turn shaped by earlier languages), changes over time and colloquial use.
We cannot expect a fantasy or alien world to have had the same influences.
In some cases the structure of the world may necessitate made up systems. For example, Alien worlds wouldn't have time periods that mirrored our Earth based time measurements.
As far as which system is best. I find that the Imperial System works best for Fantasy and the Metric System works best for Sci-Fi.
I would find metric measurements in historical fantasy out of place and I find Imperial measurements in a futuristic setting just doesn't seem right.
The weight unit of a stone is still in current use and is a precise weight (It is 14 pounds).
A lot of older Australian still use Imperial measurements instead of/ or as well as the metric system.
We rarely used the American standard of referring to our weight in pounds only.
Someone who is 200 pounds here would have (and some still do) referred to their weight in Imperial units as 14 Stone 4 pounds.
I don't worry too much about the phonology of made up worlds. English is such a bastardised language that certain groups of letters can have multiple pronunciations.
-ough has at least 10 different pronunciations, more if you include place names and surnames.
There isn't even one single set of rules for English spelling and pronunciation.
In English speaking countries we each spell and pronounce certain words differently.
I use gaol, catalogue, draught, programme and cheque.
You may use jail, catalog, draft, program and check.
I pronounce Lieutenant as lef-tenant instead of loo-tenant.
Our language has been shaped and influenced by the languages of the invaders of Britain (which were in turn shaped by earlier languages), changes over time and colloquial use.
We cannot expect a fantasy or alien world to have had the same influences.

For example, saying, "The ship was 50 meters wide." or "The castle was 100 feet tall." takes away the opportunity for the author to describe how large the ship appears to the character, or how imposing the castle seems. So for example, "The ship seemed larger than the moon."
A similar example was used in this week's episode of Geek's Guide to the Galaxy, to cite my sources.
So, generally, yes, it pulls me out of the story, whether it's reality-based or fantasy-based units of measurement. I much prefer it to be descriptive than quantitative.

Interesting and irrelevant tidbit :D


I grew up in a small town in England and could tell the time without a watch. That's what church bells are for :)
There's a logic to the different chimes a grandfather clock makes, especially the ones that chime every quarter hour. The chimes are subtly different.
Today, in most of Europe if you order a pound of something, like cheese or coffee, you will get half a kilogram (500g).

It would seem weird to me to read a fantasy with meters. As well as a fantasy that used dollars. Those would be anachronisms if they are set in medieval society.
Looking it up, dollars were around in the 17th century and meters in the 18th.

The advantage of using "kilometer" rather than "turn" (some made up unit) is that the reader actually has an idea of how far it is. So if you write, "They managed to hike through 25 kilometers of rough marshland that day," the reader has an idea of how far that is, and if the reader has done some hiking themselves will understand that that really is a long way to hike through marshland in a day.
Doing a little research, it looks like Tolkien used "miles" quite often along with "leagues" (which it turns out is 3 miles), but also uses "lar", which is a Númenórean league and slightly shorter than 3 miles.
Finally, I don't get the anachronistic worry. For one thing, it's a fantasy world, not historical fiction. For another, measurements are only technology in a very abstract sense. It's not like having a firearm in a world of bows and arrows. "Meter" seems no more anachronistic than characters that speak in modern English. In theory it's all a "translation" from whatever language your characters are "really" speaking anyways.


I live in Denmark, where foot and inches was banned from use in 1912 - it became illegal to use inches to measure wood - a law that is by the way still on the books.
I read a LOT of books in English and I always have to convert everything into metrics in my head anyway, so I personally do not care if they use a made-up unite or imperial measurements - both are strange to me and I have to convert them in my head.
So... what I am trying to say is that the unit you are most familiar with sound more modern to you. In France they have used metrics since 1799 - so it would hardly seem modern to them. In Denmark we also got standardized unites of measurement around that time - which had a huge impact on commerce. So if you want it to sound really medieval - you would want to use a non-standardized system of measurement both for weights, lengths and time. In the olden days an hour had different lengths during the day and during the year. A night time hour was not as a day time hour and a winter hour not the same as a summer hour. Talk about unit-confusion then.
I would personally use the unite of measurement that I normally use if I were to write a sci-fic or a fantasy novel - because that would be how I thought about it and most likely how my reader would think about it as well.
Sorry for the wall of text - I will shut up now.

Here's what I decided for my novel: Even though I am American, I will be using the metric system. My fantasy world has many nature-centric elements, but its people are advanced. They may walk two kilometers to get somewhere, without a second thought, but they could develop transportation if they felt motivated to do so. They like the outside (even worship it), so they don't.
Feet and yards seem a bit arbitrary to me, and I'm not convinced that my fantasy world would have come to that system of measurement away from this world that we live in. The metric system, on the other hand, is said to based on the speed of light in a vacuum. That's a good deal less arbitrary, so I feel better suggesting that the people in my world got there on their on.
But of course, every fantasy world is different. A less technologically advanced people may not be able to measure so precisely. But I'd rather read about measurements I can understand, even if it seems a bit of an anachronism. (The meeting at 4 o'clock example may be a bit too much for me though, in many cases.)

As far as I can see there are two reasons you might use metric rather than imperial to convey something about your world. First, imperial units are human-centric: they are based off things like the length of a body part, or a person's walking speed. Metric units are based of the natural world -- the size of the Earth or the mass of water. Metric thus has a more objective connotation. Second, the metric system is based on multiples of ten, so it is mathematically more tractable, and thus feels more rational. It would also make your world stand out more---as someone above mentioned, most fantasy uses imperial units if they use real world units at all, so it's something your readers would probably notice.

Neither system really "makes sense" in a completely fictional universe, so really whatever you prefer should fit.
I personally enjoy when fantasy worlds use fictional systems that have obvious correlations to either real system. The real goal (I think) is to convey distance to the reader without pulling them from the universe.



Isn't this 2 systems of distance (gnomes and potty breaks)? Does this system subscribe to the metric prefixes? I like to think there's a Gigagnome out there somewhere...