Refinance Calculator

The calculator compares your existing mortgage against a potential new one. You enter a few key details about both loans and it does the math from there.

Here's what you'll typically need to provide:

• Current loan balance: How much you still owe on your mortgage
• Current interest rate and remaining term: The rate you're locked into and how many years (or months) are left
• New loan interest rate and term: The rate and length of the refinanced loan you're considering
• Closing costs: The upfront fees required to close the new loan

Once you've filled those in, the calculator works out your new monthly payment, how much you'd save (or spend) each month, and how long it takes for those savings to offset the cost of refinancing. It gives you a concrete way to evaluate whether the deal in front of you is actually a good one.

Timing matters a lot with refinancing. The right move at the wrong time can still cost you money.

The most common reason people refinance is to lock in a lower interest rate. As a general rule, if you can drop your rate by at least half a percentage point and you plan to stay in the home long enough to recoup the closing costs, refinancing is worth a serious look. A full percentage point drop makes the math even more compelling.

Other situations where refinancing makes sense:

• You want to shorten your loan term (say, going from a 30-year to a 15-year) to build equity faster and pay less interest overall
• You need to lower your monthly payment to free up cash flow, even if that means extending the term
• You're switching from an adjustable-rate mortgage (ARM) to a fixed rate because you want payment predictability
• You want to tap into your home equity through a cash-out refinance

On the flip side, refinancing probably doesn't make sense if you're planning to sell in a year or two, if your credit score has dropped significantly since you got your current loan, or if closing costs are unusually high relative to your expected savings. Run the numbers first.

Seeing both loans side by side is the fastest way to understand what you're actually gaining or giving up. The numbers that matter most are the monthly payment, the interest rate, the remaining loan term, and the total amount you'll pay over the life of each loan.

One thing people miss in this comparison is the total interest paid. A lower monthly payment sounds great, but if you're resetting to a 30-year term after already paying 8 years into your current mortgage, you could end up paying more in interest overall even with a better rate. The side-by-side comparison makes that easy to spot.

The break-even point is the moment when your cumulative monthly savings finally cover what you paid in closing costs. Until you hit that point, you're technically still in the hole on the refinance.

The calculation is straightforward: divide your total closing costs by your monthly savings.

Example: If your closing costs are $5,000 and your new loan saves you $150 per month, your break-even point is about 33 months, just under three years.

Why does this matter? Because if you sell the house or refinance again before you hit that break-even point, you've lost money on the deal. The break-even timeline is really a minimum stay requirement. If you're confident you'll be in the home longer than that, refinancing makes financial sense. If you're not sure, it's a much riskier call.

Some lenders offer no-closing-cost refinances, which roll the fees into the loan balance or offset them with a slightly higher rate. That changes the break-even math, and not always in your favor. Make sure you're comparing apples to apples.

This is usually the first number people want to see. Lower monthly payments can meaningfully change your monthly budget, and it's satisfying to watch that number drop.

Your new monthly payment is calculated using your new loan balance, the new interest rate, and the new loan term. The formula is standard amortization math, and any good refinance calculator handles it automatically.

What you want to pay attention to is the net monthly savings: the difference between what you're paying now and what you'd pay after refinancing. A few things can complicate that number:

• If your remaining balance has gone up (say, from a cash-out refinance), your new payment might not be much lower even at a better rate
• If you're extending your loan term, the savings look bigger month-to-month but the long-term cost could be higher
• Escrow changes (property taxes, insurance adjustments) aren't part of the rate-based calculation but will affect your actual payment

Monthly savings are real and valuable. Just make sure you're looking at them in context of the total picture, not as the only number that matters.

Monthly savings get a lot of attention, but the total interest saved over the life of the loan is where the real financial impact shows up. Depending on your loan size and rate difference, we're often talking about tens of thousands of dollars.

Here's a simplified example. Say you have $300,000 left on a 30-year mortgage at 7.5%. Your total interest over the remaining term would be substantial. Refinancing to 6.5% on a new 30-year loan drops that total interest bill by a meaningful amount, even before considering any extra payments.

Shortening the term amplifies those savings even further. A 15-year loan at a lower rate can cut your total interest cost dramatically compared to riding out a 30-year mortgage, though your monthly payment will be higher. That's a trade-off worth understanding clearly.

One nuance: if you've already paid several years into your current mortgage, a big chunk of your early payments went toward interest. Resetting to a new 30-year loan means you're starting that interest-heavy early phase again. Total interest saved over the new term might look great on paper, but the actual net savings compared to staying put could be smaller than the headline number suggests. A good calculator accounts for this by comparing remaining interest on your current loan versus total interest on the new one.

Refinancing isn't free. Closing costs typically run between 2% and 5% of the loan amount, which on a $300,000 loan means $6,000 to $15,000 out of pocket (or rolled into the loan). Knowing what makes up that number helps you shop smarter.

Common closing costs include:

• Origination fee: The lender's charge for processing the loan, sometimes expressed as points
• Appraisal fee: Usually $300 to $600 to establish the current market value of your home
• Title search and title insurance: Confirms ownership and protects against title disputes
• Recording fees: Charged by your local government to update public records
• Prepaid interest: Interest owed from the closing date to the end of that month
• Discount points: Optional upfront payment to buy down your interest rate

When you're comparing lender offers, look at the Loan Estimate document. Lenders are required to provide this within three business days of your application, and it breaks down every fee in a standardized format. That makes it much easier to spot where one lender is charging significantly more than another.

Rolling closing costs into the loan is convenient but not free. You'll pay interest on those costs for the entire life of the new loan, which adds up over time. If you have the cash available, paying closing costs upfront usually comes out ahead.

After running all the numbers, this is the decision you're actually trying to make. Sometimes the math is clear. Other times it's closer than you'd expect.

Refinancing tends to win when:

• Your new interest rate is meaningfully lower than your current rate
• You plan to stay in the home well past the break-even point
• You're shortening your term and can handle the higher monthly payment
• Your credit and financial profile have improved since your original loan

Staying with your current loan often makes more sense when:

• You're close to paying off your mortgage and most payments now go to principal anyway
• Closing costs are high relative to your monthly savings
• You're planning to sell or move within a few years
• Your current rate is already competitive and the improvement is marginal

There's also the psychological side of it. Some people value the certainty of knowing exactly when their mortgage will be paid off, and resetting the clock on a new 30-year loan doesn't sit right with them, even if the monthly payment drops. That's a perfectly valid reason to stay put.

Use the numbers as your foundation, then factor in your plans, your timeline, and your comfort level. The calculator gives you the data. The decision is still yours to make.