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Redmoon Calculators
Writing, making, worldbuilding

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Guides to the math behind the tools — readability formulas, pricing your work, sizing a build, and planning a game world.

RSS feed 124 articles · page 6 of 7
· 7 min read

The LIX readability index: the formula that does not care about syllables

LIX scores text from just two things you can count without a dictionary: average sentence length and the share of words longer than six letters. That is exactly why it works across languages where Flesch and SMOG fall apart.

#readability#lix#writing#editing
· 8 min read

The Gunning Fog Index, explained: what the score means and how to lower it

The Gunning Fog Index turns two things you can control — sentence length and the density of long words — into a single school-grade number. Here is exactly how it is calculated, what counts as a "complex" word, and how to bring a foggy paragraph down a grade.

#readability#gunning-fog#writing#editing
· 8 min read

The SMOG index: the readability formula health writers actually trust

SMOG measures one thing — the density of long words — and is calibrated to full comprehension, not the gist. Here is how the score is built, why it reads a grade or two higher than other formulas, and why healthcare writing relies on it.

#readability#smog#writing#editing
· 8 min read

How to find and fix the clichés hiding in your writing

Clichés slip in precisely because they feel natural — that is the problem. Here is why dead phrases dull your prose, the six families a cliché detector hunts for, and how to swap each one for something that actually says what you mean.

#writing#editing#content#how-to
· 8 min read

How a headline analyzer scores your title (and what to do with the number)

A headline score is not magic — it is five measurable things added together. Here is exactly what a headline analyzer checks, why length, word balance, and format each move the number, and how to use the score without being fooled by it.

#seo#content#writing#headlines
· 8 min read

Letter frequency analysis: why E wins and what the counts reveal

Counting letters sounds trivial until you see what the distribution exposes — cracked ciphers, language fingerprints, and skewed prose. How frequency analysis works, what the English baseline means, and how to read the deltas.

#text-analysis#cryptography#letter-frequency#writing
· 8 min read

Text entropy, explained: what predictability actually measures

Shannon entropy turns "how predictable is this writing?" into a number. What bits-per-symbol mean, why character, word, and bigram modes disagree, and why entropy is a weak AI-detection signal, not a verdict.

#text-analysis#entropy#ai-detection#writing
· 7 min read

The Coleman–Liau Index: the readability formula built for computers

Why Coleman–Liau counts letters instead of syllables, what its L and S variables really mean, when it beats Flesch–Kincaid, and where it quietly misleads.

#readability#coleman-liau#formulas
· 7 min read

What is a good keyword density? The honest answer for modern SEO

Keyword density once ruled SEO. Now it is a guardrail, not a target. Here is what density actually measures, the safe range, and how to read 1-, 2-, and 3-word phrase results without falling for the old "magic number" myth.

#seo#keyword-density#content#writing
· 8 min read

How long does it take to cross a kingdom? A travel-time guide for writers and GMs

Why fantasy journeys break immersion when the math is wrong, the real-world pace of feet, hooves, wheels, and sails, and how terrain and rations turn a line on a map into a believable trip.

#worldbuilding#fantasy#game-design#writing
· 8 min read

Why you can’t talk to Mars in real time: a sci-fi writer’s guide to light-speed lag

Radio doesn’t travel instantly, and the delay between worlds changes by the day. Here’s the physics of conversation lag, why it breaks naive space scenes, and how to use it as a storytelling tool.

#sci-fi#worldbuilding#space#writing
· 9 min read

How many blacksmiths does a fantasy town have? Building believable settlements

Why most RPG towns have far too many shops for their size, the medieval demographics that fix it, and how population alone tells you the smiths, inns, gold limit, and farmland a settlement needs.

#ttrpg#worldbuilding#dnd#gm-tools
· 8 min read

How much fabric does a cosplay actually need? Stop guessing at the cutting table

Why bolt width, nap, and pattern repeats decide your yardage, how capes and pleated skirts eat more cloth than you think, and how to buy enough the first time.

#cosplay#sewing#maker#costuming
· 9 min read

Designing a planet readers will believe: a worldbuilder's guide to gravity

How surface gravity really works, what high- and low-g worlds do to bodies, jumps, and buildings, and how to pick numbers that keep a fictional planet physically honest.

#worldbuilding#science#sci-fi#game-design
· 8 min read

The real odds of pulling that chase card (and why the box let you down)

How booster-pack pull rates actually work, why "1 in 200" doesn't mean 200 packs, and the probability every card collector and game designer should understand.

#tcg#probability#game-design#collecting
· 8 min read

From word count to finished draft: planning a novel you will actually finish

Genre word-count targets, how manuscript words turn into print pages, and the daily-target math that makes a deadline realistic instead of aspirational.

#writing#novel#nanowrimo#planning
· 7 min read

Syncing delay and reverb to your tempo: the BPM-to-milliseconds guide

Why time-based effects sound better locked to the beat, the one formula that converts BPM to milliseconds, and how to use note divisions, dotted, and triplet times in a mix.

#music-production#audio#mixing#bpm
· 9 min read

How to price a 3D print: the costs every maker forgets

A full breakdown of what a 3D print actually costs to produce — filament, power, machine wear, failed prints, and labor — and how to turn that into a price that earns a profit.

#3d-printing#maker#pricing#etsy
· 6 min read

How reading time is calculated (and why every blog uses a different number)

The formulas behind "X minute read" labels, the wide range of WPM assumptions, and how to pick a number that matches your audience.

#reading-time#wpm#ux
· 9 min read

Dice pool probability for tabletop games: why the average roll lies to you

How dice pools really behave — bell curves vs. flat d20s, what advantage actually does to your odds, exploding dice, and how to set fair target numbers.

#ttrpg#dice#probability#game-design

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