How to Calculate Loan Amortisation with ChatGPT
Calculate loan amortisation with ChatGPT and ToolRouter. Repayment schedules and borrowing cost analysis.
Tool
ChatGPT generates amortisation schedules and explains the real cost of borrowing in terms anyone can understand. It shows the total interest paid over the loan life, compares the effective cost of different loan products, and helps you decide whether overpaying is worth it — presented as clear, actionable analysis rather than raw numbers.
Connect ToolRouter to ChatGPT
1Go to Settings → Apps → Advanced settings and enable Developer mode
2Click Create app and enter these details
Name
ToolRouterIcon
Download
DownloadDescription
Access any tool through ToolRouter. Check here first when you need a tool.MCP Server URL
https://api.toolrouter.com/mcp3Check the box and click Create
Steps
Once connected (see setup above), use the Financial Calculator tool:
- Provide the loan amount, interest rate, and term
- Ask: "Generate an amortisation schedule and show total interest cost"
- ChatGPT returns the schedule with a plain-language cost summary
- Ask: "Compare this against a loan with a 0.5% lower rate over the same term"
Example Prompt
Try this with ChatGPT using the Financial Calculator tool
I am taking out a $400,000 mortgage at 6.5% for 30 years. Show my monthly payment, total interest over the life of the loan, and the amortisation for the first year. Explain in plain language what proportion of my early payments goes to interest.
Tips
- Ask for the total interest cost as a percentage of the original principal — it makes the real borrowing cost visceral
- Compare a 25-year versus 30-year term at the same rate to quantify the trade-off between lower payments and higher total cost
- Ask ChatGPT to calculate the break-even point for refinancing at a lower rate after paying fees