Loan Calculator MCP
Loan Calculator MCP is a free server that gives AI assistants exact personal loan math instead of estimates. The assistant calls https://loancalculatormcp.com/mcp for monthly payments, APR, total interest, Truth-in-Lending figures, and amortization schedules on closed-end personal (installment) loans. The math follows CFPB Regulation Z / TILA. You add the endpoint once; after that, the assistant uses the calculator whenever a financing question needs precise numbers.
Documentation
What you can ask
Copy a prompt into your assistant. The figures shown are live results from the calculator.
Calculate the APR for a $10,000 personal loan with a 12.5% interest rate, 36-month term, and 3% origination fee.
→ APR 14.64% — the fee pushes it above the 12.5% note rate
Show me the monthly payment for a $50,000 loan at 6.5% for 3 years.
→ $1,532.45 / month, 35 payments plus a final $1,532.46
How much interest would I save if I paid an extra $200 per month?
→ Returns months shaved off the term and total interest saved
Compare a 48-month and a 60-month personal loan for the same amount and rate.
→ Side-by-side payment and total-cost comparison
How much principal and interest will I pay in the first year?
→ Pulled from a full period-by-period amortization schedule
Connect it to Claude
Three steps, about a minute. Works in any MCP-compatible client.
- 1
Open connector settings
In Claude, go to Settings → Connectors → Add custom connector. - 2
Paste the endpoint
Use the MCP URL above:https://loancalculatormcp.com/mcp - 3
Ask a financing question
Claude calls the calculator automatically whenever the math matters.
Prefer editing a config file? Add this to your MCP client configuration:
{
"mcpServers": {
"loan-calculator-mcp": {
"url": "https://loancalculatormcp.com/mcp"
}
}
}
Tools
Each maps to one focused, exact calculation. Expand a tool to see example input and output JSON.
calculate_monthly_payment Regular and final payment, payment counts, and payoff dates.
Input
{
"loan_amount": 50000,
"loan_term_months": 36,
"interest_rate": 6.5,
"disbursement_date": "2024-01-15"
}
Output
{
"regular_payment": 1532.45,
"final_payment": 1532.46,
"number_of_full_payments": 35,
"number_of_partial_payments": 1,
"first_payment_date": "2024-02-15",
"last_payment_date": "2027-01-15",
"warnings": []
}
calculate_apr Reg Z APR via the Appendix J actuarial method, reflecting fees.
Input
{
"loan_amount": 10000,
"loan_term_months": 36,
"interest_rate": 12.5,
"prepaid_finance_charge_rate": 3,
"disbursement_date": "2024-01-15"
}
Output
{
"apr_percent": 14.6379,
"warnings": []
}
generate_disclosure Truth-in-Lending-style totals: amount financed, finance charge, total of payments.
Input
{
"loan_amount": 10000,
"loan_term_months": 36,
"interest_rate": 12.5,
"prepaid_finance_charge_rate": 3,
"disbursement_date": "2024-01-15"
}
Output
{
"amount_financed": 9700,
"prepaid_finance_charge": 300,
"finance_charge": 2343.28,
"total_of_payments": 12043.28,
"apr_percent": 14.6379,
"regular_payment": 334.54,
"final_payment": 334.38,
"number_of_full_payments": 35,
"number_of_partial_payments": 1,
"first_payment_date": "2024-02-15",
"last_payment_date": "2027-01-15",
"warnings": []
}
generate_amortization_schedule Period-by-period schedule with optional extra payments and interest saved.
Input
{
"loan_amount": 6000,
"loan_term_months": 6,
"interest_rate": 9,
"disbursement_date": "2024-01-15",
"extra_payments": {
"one_time": { "1": 1000 }
}
}
Output
{
"rows": [
{
"period": 1,
"payment_date": "2024-02-15",
"payment": 2026.41,
"interest": 45,
"principal": 1981.41,
"extra_principal": 1000,
"remaining_balance": 4018.59
},
{
"period": 2,
"payment_date": "2024-03-15",
"payment": 1026.41,
"interest": 30.14,
"principal": 996.27,
"extra_principal": 0,
"remaining_balance": 3022.32
},
{
"period": 3,
"payment_date": "2024-04-15",
"payment": 1026.41,
"interest": 22.67,
"principal": 1003.74,
"extra_principal": 0,
"remaining_balance": 2018.58
},
{
"period": 4,
"payment_date": "2024-05-15",
"payment": 1026.41,
"interest": 15.14,
"principal": 1011.27,
"extra_principal": 0,
"remaining_balance": 1007.31
},
{
"period": 5,
"payment_date": "2024-06-15",
"payment": 1014.86,
"interest": 7.55,
"principal": 1007.31,
"extra_principal": 0,
"remaining_balance": 0
}
],
"summary": {
"total_interest": 120.5,
"total_paid": 6120.5,
"payoff_period": 5,
"payoff_date": "2024-06-15",
"months_saved": 1,
"interest_saved": 37.98,
"total_extra_principal": 1000
},
"warnings": []
}
FAQ
Answers about the free Loan Calculator MCP server: how to connect Claude, ChatGPT, Cursor, and Gemini, what the personal loan math covers, and how Regulation Z / TILA figures are produced.
What is Loan Calculator MCP?
Loan Calculator MCP is a free Model Context Protocol (MCP) server that gives AI assistants such as Claude, ChatGPT, Cursor, and Gemini exact personal loan math instead of estimates. The assistant calls https://loancalculatormcp.com/mcp for monthly payments, APR, total interest, Truth-in-Lending figures, and amortization schedules on closed-end personal (installment) loans.
The math follows CFPB Regulation Z / TILA. You add the endpoint once; after that, the assistant uses the calculator whenever a financing question needs precise numbers.
Is Loan Calculator MCP free?
Yes. Loan Calculator MCP is a free MCP server. There is no account, sign-up, API key, or payment.
Add https://loancalculatormcp.com/mcp to a compatible AI client — Claude, ChatGPT, Cursor, Gemini, or any other MCP-compatible assistant — and start asking personal loan questions.
Which AI assistants work with it?
Loan Calculator MCP works with any AI assistant that supports custom MCP connectors, including Claude (web, desktop, and mobile), ChatGPT, Cursor, and Gemini. You add https://loancalculatormcp.com/mcp once.
After it is connected, the assistant can compute monthly payments, APR, and amortization inside the conversation instead of guessing. Client menus differ; the endpoint URL is the same.
How do I add a loan calculator to Claude?
To add Loan Calculator MCP to Claude, open Settings → Connectors → Add custom connector, paste https://loancalculatormcp.com/mcp, and save. Claude then calls the calculator automatically when a question needs exact loan math.
No extra commands or API key are required. The same endpoint works in Claude on the web, desktop, and mobile.
How do I add a loan calculator to ChatGPT?
ChatGPT can use Loan Calculator MCP in clients that support MCP connectors. Add https://loancalculatormcp.com/mcp the same way you add a custom connector in Claude.
Once connected, ChatGPT can return monthly payments, APR (including fees), and amortization schedules instead of estimating the numbers itself.
How do I add Loan Calculator MCP to Cursor or another MCP client?
Loan Calculator MCP is a standard Streamable HTTP MCP server. In Cursor, or in any other MCP-compatible client (including Gemini where custom connectors are available), add a server whose URL is https://loancalculatormcp.com/mcp.
After the connector is saved, ask a personal loan question. The client should call the calculator tools automatically whenever the math matters.
What is the MCP server URL?
The Loan Calculator MCP server URL is https://loancalculatormcp.com/mcp. That is the Streamable HTTP endpoint you paste into Claude, ChatGPT, Cursor, Gemini, or any other MCP-compatible client.
The homepage is https://loancalculatormcp.com/. Use the /mcp path for the connector, not the website URL alone.
What can the loan calculator calculate?
Loan Calculator MCP calculates the regular monthly payment and the (possibly different) final payment, the Regulation Z APR including fees, and a Truth-in-Lending summary: amount financed, finance charge, and total of payments.
It also produces a period-by-period amortization schedule and can apply one-time or recurring extra principal to show months saved and interest saved. Each function is a separate MCP tool an assistant can call.
What loans does it support?
Loan Calculator MCP is built for closed-end personal and installment loans with a fixed amount, interest rate, and term — for example personal loans, debt-consolidation loans, and similar fixed-payment financing under U.S. CFPB Regulation Z / TILA.
It does not model revolving credit such as credit cards or lines of credit, and it does not model HELOC or other open-end products that have no fixed payoff schedule.
What is the difference between APR and interest rate?
The interest rate is the yearly cost of borrowing the loan principal. The APR (annual percentage rate) includes that interest plus required fees, such as an origination or prepaid finance charge, so it reflects the loan's true cost.
APR is usually higher than the note rate, which makes it the better number for comparing loan offers. Loan Calculator MCP computes APR with the Regulation Z Appendix J actuarial method, not a simple restatement of the interest rate.
Can it model extra payments or early payoff?
Yes. Loan Calculator MCP can model one-time or recurring extra principal on a personal loan amortization schedule. The generate_amortization_schedule tool is the function that honors extra payments.
The result shows the shortened term, payoff date, months saved, and total interest saved, so an AI assistant can answer “what if I pay extra?” with exact figures.
How accurate are the figures?
Loan Calculator MCP follows CFPB Regulation Z and the Truth in Lending Act (12 CFR part 1026). APR uses the Appendix J actuarial method, and disclosure-style figures follow 12 CFR 1026.18.
Both monthly and daily (actual/365) interest accrual are supported. When the same terms and accrual assumptions are used, results are often very close to a lender's quoted figures. Lender-specific rounding, day-count, fee treatment, or first-payment conventions can still produce different amounts; always confirm with the creditor.
Does it store my loan data?
No. Loan Calculator MCP does not store the loan amounts, rates, or results you enter, and it does not keep an account or database of your calculations. Each request is computed on the fly.
Like any website, the server may keep standard access logs (such as IP address and request time) for security and basic analytics. Those logs do not include your loan figures.
Is this a lender or financial advice?
No. Loan Calculator MCP is not a lender, broker, marketplace, or financial advisor, and it does not make loan offers or approve credit. The figures are informational and educational only — not legal, financial, tax, or investment advice.
Using the MCP server does not create a professional or fiduciary relationship. Consult a qualified professional before making borrowing decisions, and confirm every figure with your lender.
Is this a required Truth-in-Lending disclosure?
No. Output from Loan Calculator MCP is not a Truth-in-Lending disclosure or any other required consumer disclosure, even though the math follows CFPB Regulation Z (12 CFR part 1026).
Any creditor remains solely responsible for verifying figures and for the accuracy, content, and delivery of any disclosure it provides to a consumer. AI assistants may also paraphrase results; treat them as estimates until the lender confirms them.