Loan / Debt Payoff Calculator

What this tool does

Calculates months to payoff, total interest, and an amortization table for a loan. You enter principal, interest rate, and monthly payment; optionally add extra payment to see interest savings. Educational only; not financial advice. Not AI-powered.

When to use it

• Planning payoff for a student loan, car loan, or credit card
• Seeing how much extra payment shortens the term and saves interest
• Checking the amortization schedule (how much goes to principal vs interest each month)

Inputs explained

• Principal – Amount borrowed or current balance. See principal.
• Interest rate % – Annual rate. See interest rate.
• Monthly payment – Fixed payment per month.
• Extra payment – (Optional) Additional amount applied to principal each month.

How to use it

1. Enter principal, rate, and monthly payment. Optionally add extra payment.
2. Click Calculate. Review payoff timeline, total interest, and amortization table.

Common mistakes

• Entering annual payment instead of monthly (or vice versa)
• Assuming extra payment is applied to principal (this tool does; some servicers apply differently)

Use it with AI

This tool is not AI-powered. It is a calculator. You can use the results with an AI assistant in these ways:

• Paste your payoff summary and ask for a one-paragraph plan (e.g. pay extra for 12 months then reassess).
• Ask an AI to list 5 ways to free up cash for extra payments.
• Use the AI Toolkit and Founder Ops AI Workflow for cash flow planning.

Explore the AI Toolkit and Founder Ops AI Workflow for more.

Related tools

• Simple SBA Payment Estimator
• Break-even Calculator
• Burn Rate / Runway Calculator

Related glossary terms

• Principal
• Interest rate
• Amortization

Related pages

• AI Hub
• AI Toolkit
• Business / Finance
• Break-even Calculator
• Burn Rate / Runway Calculator
• SaaS ROI Deal Analyzer
• Freelance Rate Calculator
• Employee vs Contractor Calculator

FAQ

Does it support multiple loans?

One loan per calculation. Run separate calculations for each.

How does extra payment work?

Applied to principal each month. Reduces total interest and shortens payoff.

Is this financial advice?

No. Educational only. Consult a financial advisor.