Calculate readability, in one paste.
Score your writing with the formulas pros use — then price a job, size a build, or plan a world. No signup. No ads in your face. Just answers.
- No signup
- Runs in your browser
- 104 calculators
- Open formulas
Plain English for most adults (8th–9th grade).
- Words
- 241
- Sentences
- 14
- Avg words / sentence
- 17.2
- Syllables / word
- 1.48
Why Redmoon Calculators
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Calculations run locally as you type — no waiting on a server, no upload of your work.
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The classic formulas, done right
Carefully implemented — including the canonical Dale–Chall word list and a battle-tested syllable counter.
Everything in one place
Over 100 calculators covering readability, text analysis, writing utilities, publishing, maker pricing, and worldbuilding — each with a worked example and a written guide.
Most popular
All tools →Flesch Reading Ease Calculator
Classic 0–100 readability score.
Try nowFlesch–Kincaid Grade Level Calculator
U.S. grade level for your text.
Try nowGunning Fog Index Calculator
Penalises complex (3+ syllable) words.
Try nowReading Time Estimator
How long does your text take to read?
Try nowReadability Consensus Score
Runs every classic formula and reports a consensus grade.
Try nowSyllable Counter & Analyzer
Total + per‑word syllable counts.
Try nowBrowse by category
Readability scores
16 calculators
Flesch Reading Ease Calculator · Flesch–Kincaid Grade Level Calculator · Gunning Fog Index Calculator · Readability Consensus Score · …
Text analysis
22 calculators
Syllable Counter & Analyzer · Keyword Density Analyzer · Word Frequency Analyzer · Passive Voice Detector · …
Writing & editing
11 calculators
Reading Time Estimator · Book Length & Writing Goal Planner · Script Read Time / Voiceover Timer · Headline Analyzer · …
Generators & word games
5 calculators
Scattergories Generator · Charades Word Generator · Pictionary Word Generator · Story Prompt Generator · …
Tabletop & worldbuilding
13 calculators
Fantasy Travel Time Calculator · Dice Pool Probability Calculator · TTRPG Settlement Demographics Calculator · Fantasy Calendar Generator & Date Converter · …
Game dev & streaming
4 calculators
Sprite Sheet & VRAM Budget Calculator · Stream / OBS Layout Pixel Budgeter · Retro Game ROM / RAM Budget Calculator · Indie Game Audio File Size Estimator
Pricing & selling your work
13 calculators
3D Print Cost & Profit Estimator · Laser Cutter Job Cost & Margin Calculator · Etsy Fee & Profit Calculator · KDP Royalty & Book Price Calculator · …
Maker & workshop
13 calculators
BPM → Delay & Reverb Time (ms) · Cosplay Fabric & Material Estimator · Miniature Scale & Terrain Converter · Miniature Paint Mix & Volume Calculator · …
Home, tech & everyday
7 calculators
EV Charging Cost & Road Trip Calculator · PC Build Wattage & PSU Calculator · Wedding & Party Alcohol Calculator · 3D Printer Electricity Cost Calculator · …