Axiom Calculator MCP
Personal finance calculators: mortgage payments, compound interest, FIRE retirement number, loan comparison, true borrowing cost and debt payoff.
Install
The installation steps are in the documentation below. Documentation
Documentation
From the project's README on GitHub, refreshed weekly. Links open on GitHub.
Contents
Axiom Calculator MCP
Personal finance calculators for Claude and AI agents — mortgage payments, compound interest, FIRE retirement number, loan comparison, debt payoff, and inflation-adjusted returns.
Zero API keys. Zero setup. Works instantly with any MCP client.
Tools (8 total)
| Tool | What it does |
|---|---|
mortgage_calculator | Monthly payment, total interest, 12-month amortization schedule |
rent_vs_buy | Compare total cost of renting vs buying over N years (includes equity, appreciation, opportunity cost) |
compound_interest | Project investment growth with optional monthly contributions — year-by-year table |
fire_number | Calculate your FIRE target portfolio and years-to-retirement timeline |
inflation_adjusted_return | Real vs nominal return — see if your investments actually beat inflation |
loan_comparison | Compare two loans by total cost, monthly payment, and true APR (including fees) |
true_credit_cost | Find the real APR of any financing offer, BNPL, or credit product |
debt_payoff_plan | Payoff timeline and interest saved from extra monthly payments |
Install
Claude Desktop / Claude Code
Add to your MCP config:
{
"mcpServers": {
"calculator": {
"command": "uvx",
"args": ["axiom-calculator-mcp"]
}
}
}Any MCP client (stdio)
uvx axiom-calculator-mcpFrom source
git clone https://github.com/vdalhambra/axiom-calculator-mcp
cd axiom-calculator-mcp
uv run axiom-calculatorExample usage
Once connected, just ask Claude naturally:
"I'm looking at a $450,000 house with 20% down at 6.8% for 30 years. What's my monthly payment and total interest?"
"Compare a 15-year loan at 6.2% vs 30-year at 6.8% for $380,000. Which is better overall?"
"I spend $48,000/year. How much do I need to retire, and how long will it take if I save $24,000/year?"
"I have $8,500 in credit card debt at 22% APR. How long to pay it off at $250/month, and how much do I save if I add $100/month extra?"
Why this exists
Most finance calculators are either locked behind paywalls, require accounts, or are ad-stuffed websites. This MCP gives Claude direct access to accurate financial math — no API keys, no rate limits, no middleman.
Part of the Axiom MCP suite
- FinanceKit MCP — Stock quotes, fundamentals, crypto, insider transactions
- SiteAudit MCP — SEO audits, Core Web Vitals, backlink analysis
License
MIT — free to use, modify, and distribute.
Frequently asked questions
What is Axiom Calculator MCP?
Personal finance calculators: mortgage payments, compound interest, FIRE retirement number, loan comparison, true borrowing cost and debt payoff.
How do I install Axiom Calculator MCP?
Follow the installation steps in its documentation, shown on this page and in its repository.
Is Axiom Calculator MCP open source?
Yes. Its code is on GitHub under the MIT license.
Who maintains Axiom Calculator MCP?
It is published by vdalhambra. AI.tn lists it but does not maintain or endorse it.
From the community awesome-mcp-servers lists and the project's GitHub repository. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.