Mortgage Payoff Calculator — Extra Payments Save Interest
See how extra payments can pay off your mortgage faster and save thousands in interest.
How to use this calculator
👉 Fill in the boxes below and your answer appears instantly — no maths needed, we do it all for you! 🎉
In plain English — what does this do?
🏠 You want to buy something big (like a house or car) but you don’t have all the money right now. A bank gives you the money today, and you pay it back little by little every month. This tool tells you ‘how much do I pay each month?’
A mortgage payoff calculator shows how making extra payments — monthly, yearly, or a one-time lump sum — can dramatically shorten your loan term and reduce total interest paid. Even small additional amounts applied to principal each month can save tens of thousands of dollars over the life of a loan.
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What is Mortgage Payoff Calculator — Extra Payments Save Interest?
A mortgage payoff calculator shows how making extra payments — monthly, yearly, or a one-time lump sum — can dramatically shorten your loan term and reduce total interest paid. Even small additional amounts applied to principal each month can save tens of thousands of dollars over the life of a loan.
How to use it
- 1️⃣ Enter your original loan amount and annual interest rate.
- 2️⃣ Input your remaining loan term in years.
- 3️⃣ Add any extra payment amount you plan to make each month.
- 4️⃣ Optionally add a one-time lump sum extra payment.
- 5️⃣ The calculator shows your new payoff date, time saved, and total interest saved.
Formula
💡 See it in action — a real example
❓ Common questions
- Does it matter when I make extra payments?
- Earlier extra payments save more interest because they reduce the principal balance on which future interest is calculated. The sooner you pay extra, the more you save.
- Should I pay extra or invest the difference?
- If your expected investment return exceeds your mortgage rate, investing may yield more mathematically. But paying off debt is a guaranteed risk-free return equal to your interest rate.
- Can I make a one-time lump sum payment?
- Yes. A lump sum applied directly to principal has the same effect as many months of extra payments at once, immediately reducing the interest accruing each month.
- Will my monthly payment decrease with extra payments?
- Usually no — standard loans keep the payment fixed but shorten the term. Some lenders allow recasting, which recalculates a lower payment after a large principal reduction.
- How do I ensure extra payments go to principal?
- Tell your lender explicitly that the additional amount should be applied to principal, not to next month's payment. Check your statement to confirm it was applied correctly.