Chat with your calculator
Every Calc.Cards calculator is available as an AI agent skill file. Drop it into Claude Code, add it to your AI workflow, and get a conversational calculator that understands your context, not just the math.
Ask follow-up questions. Run scenarios. Get the interpretation, not just the number.
Try before you buy
Get one skill free
Pick any of the 395calculators. We'll email the .md skill file straight to your inbox โ no card, no signup beyond your address.
Drop the file into your .claude/skills/ directory, paste it as a system prompt in ChatGPT, or load it into any agent runtime that handles markdown skills.
Pricing
Starter Pack
$9
Pick any 3 skills. Best way to try the AI agent format with the calculators you actually use.
- โ 3 skills, your choice
- โ Full .md files with formulas
- โ Works with Claude, ChatGPT, any LLM
- โ $3 per skill effective
Category Pack
$29
Every skill in one category. Finance, Health, Construction. Pick your industry.
- โ 8 to 52 skills per pack
- โ Complete industry coverage
- โ $0.50 to $3.60 per skill
- โ New skills added free
Full Library
$79
All 395 skills across every category. One purchase, everything.
- โ All 395 skill files
- โ Every category included
- โ Lifetime updates included
- โ ~$0.21 per skill
How it works
Buy a skill or pack
Choose individual calculators or a full category pack. Instant download after purchase.
Drop into your AI
Add the .md file to Claude Code as a skill, or paste into any AI platform as a system prompt.
Chat with the calculator
Describe your situation in plain English. The AI gathers inputs, runs the math, and interprets results in your context.
Browse by category
Finance Pro Pack
$468
Every financial calculation your AI needs. Loans, investments, taxes, retirement.
Health & Wellness Pack
$342
BMI, calories, macros, dosage calculations. Clinical-grade formulas your AI can use.
Construction Estimator Pack
$315
Material quantities, cost estimates, and project calculations with built-in waste overage.
Math Toolkit Pack
$270
Statistics, geometry, algebra, probability. A math co-processor for your AI.
Unit Conversion Pack
$225
Every unit conversion your AI will ever need: length, weight, temperature, and 20 more.
Meme Pack
$225
How many licks. Walk to Mordor. Always 42. Cultural-reference math, formatted as Claude skills.
Fitness & Training Pack
$198
One-rep max, pace, calories burned, body composition. Data-driven training.
Science & Engineering Pack
$180
Ohm's law, kinetic energy, pH, half-life. Lab-grade formulas for your AI.
Business Operations Pack
$162
SaaS metrics, pricing, valuation, runway. The numbers that run a business.
Culinary Calculator Pack
$162
Recipe scaling, cooking times, ratios, substitutions. Precision in the kitchen.
Automotive Pack
$144
Fuel costs, loan payments, depreciation, EV range. Everything for vehicle decisions.
Real Estate Investor Pack
$135
Cap rates, rental yields, BRRRR analysis, and more. Built for deal analysis.
Time & Scheduling Pack
$135
Date math, business days, time zones, work hours. Temporal calculations on demand.
Education & GPA Pack
$126
GPA calculations, grade tracking, test scores. Academic planning made precise.
Energy & Sustainability Pack
$108
Solar ROI, electricity costs, carbon footprint. The math behind going green.
Pregnancy & Baby Pack
$108
Due dates, growth tracking, ovulation. Trusted calculations for every stage.
Tech & Networking Pack
$90
Subnets, bandwidth, PCB traces, storage. Calculations for builders and admins.
Travel Planning Pack
$90
Distances, flight times, budgets, currency. Calculate every trip detail.
Pet Care Pack
$72
Food portions, age conversion, medication dosing. Responsible pet math.
Who this is for
Developers & AI Builders
Add calculation capabilities to your AI agents and chatbots. Each skill file is a drop-in module with formula logic, input validation, and result interpretation.
Professionals & Consultants
Run client calculations inside your AI workflow. A mortgage broker with the Finance Pack can model scenarios mid-conversation without switching apps.
Students & Researchers
Work through problems step by step with an AI that shows its math. Great for learning formulas or verifying your own calculations.
Teams Using Claude Code
Drop skill files into your team's Claude Code setup. Every team member gets instant access to accurate calculations in their coding workflow.