CalcMark
It’s just Markdown.
Until it starts calculating.
Write your document in plain Markdown. CalcMark understands variables, converts units and currencies, then shows results — all while you type.
brew install calcmark/tap/calcmark
Why CalcMark?
Markdown with live calculations
Write natural prose and add calculations inline. Variables flow downward — change one number and everything updates.
# Weekend Trip
We have a budget for two.
budget = $2000 $2,000.00
flights = 2 * $380 $760.00
hotel = 3 * $195 $585.00
left = budget - flights - hotel $655.00Units are first-class
Physical, data, and energy units with automatic conversion. Write 5 miles in km and get the answer.
5 miles in km 8.05 km
20 celsius in fahrenheit 68 fahrenheit
500 MB in GB 0.49 GBMeasurement conventions
US gallon or Imperial? Standard ounce or Troy? Declare your convention and CalcMark resolves the ambiguity.
measurement:
volume: imperial
milk = 2 pint in ml 1,137 ml
gold = 10 troy oz 311 gramsFinancial modeling
Currency arithmetic, exchange rates, percentages, and growth functions for budgets and P&L statements.
revenue = $4.2M $4.2M
costs = 60% of revenue $2.52M
profit = revenue - costs $1.68M
compound($1000, 7%, 10 years) $1,967.15Natural language syntax
Read from storage, compress data, calculate network throughput — in plain English.
read 100 MB from ssd 0.18 s
compress 1 GB using gzip 341 MB
transfer 50 GB at 10 gbps 40 sRecipe scaling
Fractions, frontmatter scaling, and unit conversion compose naturally for cooking math.
scale: 3
flour = 2/3 cup 2 cup
butter = 1/4 cup 3/4 cup
per_loaf = $7.80 / @scale $2.60System sizing
Capacity planning with rates, napkin math, and the at...per syntax for fleet sizing.
peak = 10K req/s
servers = peak at 2K per server 5
storage = 100 MB/s over 1 day 8.64 TB
1500000 as napkin ~1.5MMarkdown meets math
Prose and calculations in one document. Embed results in text with {{variable}} templates.
## Summary
Total: {{total_cost}}
headcount = 12
rate = $150K
total_cost = headcount * rate $1.8MCLI & agent integration
Pipe expressions, export to JSON/HTML/Markdown, or integrate with AI agents via stdin/stdout.
$ echo "5 kg in lbs" | cm
11 lbs
$ cm eval budget.cm --format json
$ cm convert report.cm --to htmlVS Code extension
Syntax highlighting, live preview, and export to HTML, Markdown, or JSON — all inside your editor.
> CalcMark: Open Preview
> CalcMark: Export to HTML
> CalcMark: Export to Markdown
> CalcMark: Export to JSON