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Mortgage Refinance Calculator

Compare your current mortgage to a new, refinanced loan. See how much you could save each month, when you'll break even on closing costs, and what the total interest savings look like over the life of the loan. Every calculation generates a unique, shareable URL.

Refinance Calculator Inputs

Current Loan Details

Enter the details of your existing mortgage

Remaining balance on your current mortgage

Annual rate on your existing loan

Years left on your current mortgage

New Loan Details

Enter the terms of the refinanced mortgage

Annual rate offered for the new loan

Length of the new loan

Fees for appraisal, title, origination, etc.

Upfront fee paid to reduce the interest rate (enter 0 if none)

Compare Refinance Rates

Results update on every submission. Bookmark the URL to save your calculation.

Your Refinance Results

Monthly Savings

Monthly Savings
$347.48 /mo

Break-Even Point

15 months (1 year, 3 mo)

You'll recoup closing costs of $5,000.00 in 15 months

Side-by-Side Comparison

Comparison of your current mortgage and the proposed refinanced loan, including monthly payment, total interest, and total cost.
  Current Loan New Loan Difference
Interest Rate 7.000% 5.500% -1.500%
Loan Term 25 years 30 years +5 years
Monthly P&I Payment $1,766.95 $1,419.47 -$347.48
Total Interest $280,085.00 $261,009.20 -$19,075.80
Total Cost (P&I) $530,085.00 $516,009.20 (includes $5,000.00 closing costs) -$14,075.80
Current Monthly P&I
$1,766.95
New Monthly P&I
$1,419.47
Monthly Savings
$347.48
Total Interest Savings
$19,075.80
Total Upfront Costs
$5,000.00
Net Lifetime Savings
$14,075.80

Cumulative Cost Comparison

Year-by-year cumulative cost of the current loan versus the new refinanced loan
Year Current Loan New Loan
1 $21,203.40 $22,033.64
2 $42,406.80 $39,067.28
3 $63,610.20 $56,100.92
4 $84,813.60 $73,134.56
5 $106,017.00 $90,168.20
6 $127,220.40 $107,201.84
7 $148,423.80 $124,235.48
8 $169,627.20 $141,269.12
9 $190,830.60 $158,302.76
10 $212,034.00 $175,336.40
11 $233,237.40 $192,370.04
12 $254,440.80 $209,403.68
13 $275,644.20 $226,437.32
14 $296,847.60 $243,470.96
15 $318,051.00 $260,504.60
16 $339,254.40 $277,538.24
17 $360,457.80 $294,571.88
18 $381,661.20 $311,605.52
19 $402,864.60 $328,639.16
20 $424,068.00 $345,672.80
21 $445,271.40 $362,706.44
22 $466,474.80 $379,740.08
23 $487,678.20 $396,773.72
24 $508,881.60 $413,807.36
25 $530,083.50 $430,841.00
26 $530,083.50 $447,874.64
27 $530,083.50 $464,908.28
28 $530,083.50 $481,941.92
29 $530,083.50 $498,975.56
30 $530,083.50 $516,011.50

What Is Mortgage Refinancing?

Mortgage refinancing means replacing your existing home loan with a new one, typically to secure a lower interest rate, change your loan term, or access home equity. When you refinance, your new lender pays off your old mortgage and you begin making payments on the new loan. The process involves a new application, credit check, appraisal, and closing — similar to your original mortgage. Refinancing makes the most financial sense when the long-term savings from a lower rate outweigh the upfront costs of closing.

How This Refinance Calculator Works

This calculator compares your current loan's remaining cost to the cost of a new, refinanced loan. Here's what it calculates:

  1. Monthly Payment Comparison: Using the standard amortization formula, it calculates the monthly principal and interest for both your current and new loan.
  2. Monthly Savings: The difference between your current and new monthly payment shows your immediate cash flow benefit.
  3. Break-Even Analysis: Divides total closing costs by monthly savings to determine how many months until the refinance pays for itself.
  4. Total Interest Comparison: Compares total interest paid over the remaining life of each loan to show long-term savings.
  5. Net Lifetime Savings: Subtracts closing costs from total interest savings to give you the true bottom-line benefit of refinancing.

When Should You Refinance Your Mortgage?

Rate Drop of 0.5% or More

The traditional rule of thumb is to refinance when rates drop at least 1% below your current rate, but even a 0.5% drop can be worthwhile on large loan balances. Use this calculator to check whether your specific scenario makes sense.

Staying Past Break-Even

Refinancing only saves money if you stay in the home (and keep the loan) past the break-even point. If you plan to move or sell within a few years, the upfront closing costs may outweigh the monthly savings.

Switching Loan Type

If you have an adjustable-rate mortgage (ARM) and want the predictability of a fixed rate, refinancing provides stability. Conversely, if rates are falling, an ARM refinance could lower your initial payments.

Shortening Your Term

Refinancing from a 30-year to a 15-year mortgage typically comes with a lower rate and dramatically reduces total interest paid, though monthly payments will be higher. This is ideal if your income has increased since the original purchase.

Understanding Refinance Closing Costs

Refinancing isn't free. Closing costs typically range from 2% to 5% of the loan amount and may include:

Application Fee
$300-$500 for the lender to process your application
Appraisal Fee
$300-$700 for a professional home valuation
Title Insurance
$500-$1,500 to protect the lender against title defects
Origination Fee
0.5%-1.5% of the loan amount, charged by the lender
Discount Points
1 point = 1% of loan amount, paid upfront to lower the rate
Recording Fees
$50-$250 charged by local government to record the new deed

The Break-Even Point: When Refinancing Pays Off

The break-even point is the most important number in any refinance decision. It tells you exactly how many months of lower payments it takes to recoup the closing costs.

With your current inputs: $5,000.00 ÷ $347.48/mo = 15 months (1.3 years). If you plan to stay in your home longer than 1.3 years, refinancing is likely beneficial.

Frequently Asked Questions

How much does it cost to refinance a mortgage?

Refinancing typically costs 2-5% of the loan amount. On a $250,000 mortgage, that's $5,000-$12,500. Common costs include application fees, appraisal fees, title insurance, origination fees, and discount points. Some lenders offer "no-closing-cost" refinances, but they usually compensate with a slightly higher interest rate.

Compare rates from real lenders

How long does the refinance process take?

A typical refinance takes 30 to 45 days from application to closing. The timeline depends on how quickly you provide documentation, the appraisal schedule, title search processing, and the lender's current workload. Streamline refinances (like FHA Streamline or VA IRRRL) can close in as few as 15-20 days since they require less documentation.

Will refinancing hurt my credit score?

Refinancing may cause a temporary dip of 5-10 points on your credit score due to the hard inquiry and new account. However, if refinancing lowers your monthly payment and helps you maintain on-time payments, it can improve your score over time. If you rate-shop within a 14-45 day window (depending on scoring model), multiple mortgage inquiries count as a single inquiry.

Can I refinance if I'm underwater on my mortgage?

It's more challenging but not impossible. If you owe more than your home is worth, conventional refinancing requires PMI or a higher rate. Government-backed programs may help — for example, the FHA Streamline program doesn't require an appraisal for existing FHA borrowers, and the VA IRRRL program works similarly for VA loans. Talk to your lender about available options for your specific situation.

Should I refinance to a shorter term or keep a 30-year loan?

Refinancing to a 15-year term typically offers a lower interest rate and saves tens of thousands in total interest, but your monthly payment will be higher. A 30-year term keeps payments low, giving you more monthly flexibility. The best choice depends on your financial goals: choose a shorter term if you can comfortably afford the higher payment and want to be debt-free sooner; choose a longer term if you need cash flow flexibility or want to invest the difference elsewhere.

What is the difference between rate-and-term and cash-out refinancing?

A rate-and-term refinance (what this calculator models) replaces your current mortgage with a new one at different terms — the loan amount stays roughly the same. A cash-out refinance lets you borrow more than you currently owe and receive the difference as cash, which can be used for home improvements, debt consolidation, or other expenses. Cash-out refinances typically come with slightly higher interest rates.

Are discount points worth buying when refinancing?

Discount points are an upfront payment to reduce your interest rate — typically 1 point (1% of the loan amount) lowers the rate by 0.25%. Points make sense when you plan to keep the loan long enough for the monthly savings to exceed the upfront cost. Use this calculator to compare scenarios with and without points by adjusting the "Points" and "New Interest Rate" fields. If you plan to stay in the home for many years, points often pay for themselves. If you might move or refinance again soon, skip the points.

How accurate is this refinance calculator?

The P&I calculations use the standard amortization formula and are accurate to the cent for fixed-rate loans. The break-even calculation uses a simple payback method (closing costs / monthly savings), which is a good approximation. A more precise analysis would account for the time value of money and tax deductions, but the simple method gives a reliable rule-of-thumb answer. This calculator does not account for property taxes, insurance, or PMI — use our Payment Calculator for a full PITI breakdown.