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Personal finance calculators for Claude and AI agents — mortgage, compound interest, FIRE, loan comparison, debt payoff.
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.
| 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 |
Add to your MCP config:
{
"mcpServers": {
"calculator": {
"command": "uvx",
"args": ["axiom-calculator-mcp"]
}
}
}
uvx axiom-calculator-mcp
git clone https://github.com/vdalhambra/axiom-calculator-mcp
cd axiom-calculator-mcp
uv run axiom-calculator
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?"
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.
MIT — free to use, modify, and distribute.
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