I recently shipped a side project: PayoffCalculators.org — a set of free online loan payoff calculators.
Why I built this
Most mortgage calculators only show you the monthly payment. They don't answer the real question: how much can I save by paying extra?
I wanted a simple tool where you plug in your loan details, add an extra monthly payment, and instantly see:
- How many months you cut off your loan
- How much interest you save
- A full amortization schedule
What's included
- Mortgage Payoff Calculator
- Auto Loan Payoff Calculator
- Loan Payoff Calculator
- RV Loan Calculator
- Motorcycle Loan Calculator
- Construction Loan Calculator
Tech stack
Next.js + Tailwind CSS, deployed on Cloudflare Workers. The calculation formulas are open source:
loan-payoff-formulas.
No signup, no ads, no tracking. Just math.
Would love any feedback!
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