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axiom-calculator-mcp

axiom-calculator-mcp

by vdalhambra
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

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.

PyPI License: MIT

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

Related MCP server: MiAsistente

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-mcp

From source

git clone https://github.com/vdalhambra/axiom-calculator-mcp
cd axiom-calculator-mcp
uv run axiom-calculator

Example 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.

Available Tools

8 tools
compound_interestA
Read-only

Project investment growth with compound interest and optional regular contributions.

Shows final value, total contributions, total interest earned, and a year-by-year growth table. Uses the standard compound interest formula with optional periodic contributions.

Inputs: principal (required), annual_rate_pct (required), years (required), monthly_contribution, +1 more. Returns: object

debt_payoff_planA
Read-only

Calculate how long to pay off a debt and how much interest you'll pay.

Compares the base payment plan vs adding extra monthly payments, showing exactly how many months and dollars you save.

Inputs: balance (required), annual_rate_pct (required), monthly_payment (required), extra_monthly. Returns: object

fire_numberA
Read-only

Calculate your FIRE (Financial Independence, Retire Early) number and timeline.

Finds the portfolio size needed to cover your expenses indefinitely using the chosen withdrawal rate. If you provide current savings and annual savings rate, also estimates how many years until you reach FIRE.

Inputs: annual_expenses (required), withdrawal_rate_pct, current_savings, annual_savings, +2 more. Returns: object

inflation_adjusted_returnA
Read-only

Calculate the real (inflation-adjusted) return on an investment.

Shows the difference between nominal growth and actual purchasing power growth. Useful for understanding if your investments are truly beating inflation.

Inputs: nominal_return_pct (required), inflation_rate_pct (required), years (required), initial_amount. Returns: object

loan_comparisonA
Read-only

Compare two loan options by total cost, monthly payment, and true APR.

Helps decide between a lower rate with higher fees vs higher rate with lower fees, or shorter term (higher payment, less interest) vs longer term (lower payment, more interest).

Inputs: loan_amount (required), option_a_rate_pct (required), option_a_years (required), option_b_rate_pct (required), +3 more. Returns: object

mortgage_calculatorA
Read-only

Calculate monthly mortgage payment, total interest paid, and full amortization summary.

Returns the monthly principal+interest payment, total interest over the loan life, total cost of the home, break-even analysis, and the first 12 months of amortization. Optionally includes property tax and insurance in the total monthly cost.

Inputs: home_price (required), down_payment_pct (required), annual_rate_pct (required), years (required), +1 more. Returns: object

rent_vs_buyA
Read-only

Compare total cost of renting vs buying over a given number of years.

Accounts for mortgage payments, equity built, opportunity cost of down payment, rent increases over time, and home appreciation. Returns which option is cheaper and by how much over the analysis period.

Inputs: home_price (required), down_payment_pct (required), annual_rate_pct (required), years (required), +3 more. Returns: object

true_credit_costA
Read-only

Find the true total cost and implied APR of any credit product.

Works for car financing, buy-now-pay-later, credit card minimum payments, personal loans, and any fixed payment schedule. Cuts through misleading '0% financing' or low-rate marketing to show actual cost.

Inputs: purchase_price (required), monthly_payment (required), num_payments (required), upfront_fees, +1 more. Returns: object

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

    Deploy Server
    One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

    TDQS

    A4.3/5.0

    Scored across 8 tools

    Disambiguation5/5

    Each tool has a clearly distinct financial calculation purpose with no overlap: compound interest, debt payoff, FIRE number, inflation-adjusted return, loan comparison, mortgage, rent vs. buy, and credit cost. The descriptions specify unique use cases, making misselection unlikely.

    Naming Consistency4/5

    Tool names follow a consistent snake_case pattern with descriptive terms (e.g., compound_interest, debt_payoff_plan). However, there is a minor deviation with 'true_credit_cost' using 'true' as a modifier, while others like 'inflation_adjusted_return' use adjectives differently, slightly affecting uniformity.

    Tool Count5/5

    With 8 tools, the server is well-scoped for a financial calculator domain. Each tool addresses a specific, common financial scenario, and the count is neither too sparse nor bloated, fitting typical user needs effectively.

    Completeness5/5

    The tool set comprehensively covers key personal finance calculations: investment growth, debt management, retirement planning, inflation, loan analysis, mortgages, housing decisions, and credit costs. There are no obvious gaps, providing full lifecycle coverage for financial decision-making.

    Maintenance

    ActivityInactive
    ResponsivenessNo recent community issues

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