How to Calculate Loan Amortisation with Claude
Calculate loan amortisation with Claude and ToolRouter. Full repayment schedules and interest analysis in your terminal.
Tool
Claude generates the amortisation schedule and then explores it with you. It calculates total interest paid over the loan life, shows what overpaying by £200 per month saves in interest and time, and compares two loan offers side by side — turning a repayment schedule into a tool for smarter borrowing decisions.
Connect ToolRouter to Claude
1Open connector settings Open Settings
2Add a custom connector with these details
Name
ToolRouterURL
https://api.toolrouter.com/mcp3Let Claude set you up Open Claude
Steps
Once connected (see setup above), use the Financial Calculator tool:
- Provide loan details: principal, interest rate, and term
- Ask Claude: "Generate a full amortisation schedule for this loan"
- Claude returns the complete schedule with total interest cost
- Ask: "What if I overpay by £300 per month? How much interest would I save?"
Example Prompt
Try this with Claude using the Financial Calculator tool
Generate an amortisation schedule for a £250,000 mortgage at 4.5% over 25 years. Show the monthly payment breakdown for the first 12 months and the total interest paid over the full term. Then show what overpaying by £200/month would save.
Tips
- Ask Claude to show the crossover point where principal exceeds interest in each monthly payment
- Compare two different interest rates to quantify the cost of a higher-rate loan over the full term
- Ask about the impact of a one-off lump sum overpayment at year 5 or year 10