Mortgage refinancing is one of the most significant financial decisions a US homeowner can make. Done correctly, it can save tens of thousands of dollars over the life of a loan. Done incorrectly, it can cost more than it saves. The key to making the right decision is running the numbers — comparing your current loan terms with potential refinance terms and calculating whether the savings justify the closing costs. In this guide, we show you how to use free online calculators to determine if refinancing makes sense for your situation.
What Is Mortgage Refinancing?
Mortgage refinancing replaces your existing home loan with a new one, typically with different terms. The new loan pays off the old loan, and you begin making payments on the new loan. Homeowners refinance for several reasons: to secure a lower interest rate, to shorten the loan term (e.g., from 30 years to 15 years), to switch from an adjustable-rate mortgage to a fixed-rate mortgage, or to tap into home equity through a cash-out refinance.
In the US, mortgage rates fluctuate based on economic conditions, Federal Reserve policy and market factors. When rates drop significantly below what you are currently paying, refinancing can reduce your monthly payment and the total interest paid over the life of the loan. Even a 1% rate reduction on a $300,000 loan can save over $50,000 in interest over 30 years.
When Does Refinancing Make Sense?
Refinancing makes sense when the financial benefits outweigh the costs. The primary factors to consider are:
Interest rate reduction. The traditional rule of thumb is that refinancing is worth considering if you can lower your rate by at least 0.5% to 1%. But this is just a starting point — the real test is the break-even analysis (covered below).
How long you plan to stay in the home. Refinancing has upfront costs (closing costs). If you sell the home before those costs are recouped through monthly savings, you lose money. Generally, you should plan to stay in the home for at least 2 to 5 years after refinancing for it to be worthwhile.
Your credit score. The best refinance rates go to borrowers with credit scores of 740 or higher. If your credit score has improved since you got your original mortgage, you may qualify for a better rate now. If it has dropped, you may not get a favorable rate.
Your home equity. Most lenders require at least 20% equity for the best refinance rates. If you have less than 20% equity, you may need private mortgage insurance (PMI), which adds to your monthly cost and reduces the savings from refinancing.
Using a Mortgage Calculator to Compare
The Mortgage Calculator is your primary tool for comparing your current loan with a potential refinance. Here is how to use it:
Step 1: Calculate your current payment. Enter your current loan balance (not the original loan amount — the remaining balance), your current interest rate and your remaining term. The calculator shows your current monthly principal and interest payment.
Step 2: Calculate the refinance payment. Enter the same loan balance, the new interest rate you are being offered and the new term. The calculator shows your new monthly payment.
Step 3: Calculate the monthly savings. Subtract the new payment from the current payment. For example, if your current payment is $2,000 and the refinance payment is $1,750, your monthly savings is $250.
Step 4: Calculate total interest savings. Use the Loan Calculator to see the total interest paid under each scenario. The difference is your total interest savings over the life of the loan.
Calculating the Refinance Break-Even Point
The break-even point is the moment when your accumulated monthly savings equal the closing costs of the refinance. It is the most important number in the refinance decision. The formula is: Break-Even Months = Closing Costs / Monthly Savings.
For example, if your closing costs are $6,000 and your monthly savings is $250, your break-even point is 24 months ($6,000 / $250). If you plan to stay in the home for more than 24 months, refinancing saves you money. If you sell before 24 months, you lose money.
The Break-Even Calculator handles this calculation. Enter your fixed costs (closing costs), your "price" (monthly savings) and your "variable cost" (0, since the savings is pure benefit). The calculator shows the break-even point in months.
For US homeowners, the break-even analysis is the deciding factor. A refinance that saves $300 per month but costs $9,000 in closing costs has a 30-month break-even. If you are planning to move in 2 years, the refinance costs you money. If you are planning to stay for 10 years, it saves you $27,000 ($300 × 90 months beyond break-even). Always run this calculation before refinancing.
Understanding Closing Costs
Refinance closing costs in the US typically range from 2% to 6% of the loan amount. On a $300,000 loan, expect $6,000 to $18,000 in closing costs. Common line items include:
Appraisal fee: $300 to $600. The lender requires an appraisal to confirm the home's current value and your equity position.
Title insurance: $1,000 to $2,000. Protects the lender against title defects.
Origination fee: 0.5% to 1% of the loan amount. The lender's fee for processing the loan.
Recording fees: $50 to $200. Government fees for recording the new mortgage.
Discount points: Optional. Each point costs 1% of the loan amount and lowers your interest rate by about 0.25%. Whether points are worth it depends on how long you plan to keep the loan.
Some lenders offer "no-cost" refinances, where the closing costs are rolled into the loan amount or offset by a higher interest rate. These can be attractive if you do not have cash for closing costs, but the higher rate means less monthly savings and a longer break-even period. Use the mortgage calculator to compare a no-cost refinance with a traditional refinance to see which is better for your situation.
Cash-Out Refinance Considerations
A cash-out refinance allows you to borrow more than your current loan balance and receive the difference in cash. For example, if you owe $200,000 on a home worth $400,000, you could refinance for $280,000, pay off the $200,000 loan and receive $80,000 in cash.
Cash-out refinances are popular for home improvements, debt consolidation and major expenses. The interest rate on a cash-out refinance is typically lower than credit card rates or personal loan rates, making it an attractive way to access capital. However, you are increasing your mortgage debt and using your home as collateral — if you cannot make the payments, you risk foreclosure.
Most US lenders require at least 20% equity remaining after a cash-out refinance. Using the example above, $280,000 on a $400,000 home leaves 30% equity, which meets the 20% requirement. Use the Mortgage Calculator to estimate the new monthly payment on the larger loan amount and ensure it fits your budget.
Refinance Decision Checklist
Before refinancing, work through this checklist:
✓ Check current mortgage rates and compare to your existing rate.
✓ Calculate your current monthly payment using the Mortgage Calculator.
✓ Calculate the potential refinance payment at the new rate.
✓ Determine your monthly savings (current payment minus new payment).
✓ Estimate closing costs (2% to 6% of the loan amount).
✓ Calculate the break-even point (closing costs divided by monthly savings).
✓ Decide if you plan to stay in the home past the break-even point.
✓ Check your credit score — aim for 740+ for the best rates.
✓ Verify your home equity — aim for 20%+ to avoid PMI.
✓ Get quotes from at least 3 lenders to compare rates and closing costs.
For US homeowners, the refinance decision comes down to simple math: do the monthly savings justify the upfront costs within your expected time in the home? Free calculators make this analysis accessible to everyone. Bookmark the Mortgage Calculator, the Loan Calculator and the Break-Even Calculator, and run the numbers before signing any refinance paperwork.