Free Mortgage Refinance Calculator (2026)
Calculate monthly and lifetime refinance savings. Calculate instantly — no signup required. Updated for 2026.
What Is a Mortgage Refinance Calculator?
A mortgage refinance calculator helps you determine whether replacing your existing mortgage with a new loan at a different interest rate, term, or both makes financial sense. Refinancing can lower your monthly payment, reduce total interest costs, switch from an adjustable rate to a fixed rate, or allow you to tap home equity through a cash-out refinance. However, refinancing comes with closing costs typically ranging from $3,000 to $8,000, so the decision requires careful analysis.
The key metric this calculator produces is the break-even point — the number of months it takes for your monthly savings to recoup the closing costs. If you plan to stay in your home beyond the break-even point, refinancing makes financial sense. If you might sell or move before then, keeping your current mortgage is usually the better choice.
How Does This Calculator Work?
You enter details for both your current and proposed new mortgage:
- Current loan balance: The remaining principal on your existing mortgage.
- Current interest rate: Your existing mortgage rate.
- Current remaining term: How many months/years are left on your current loan.
- New interest rate: The rate offered for refinancing.
- New loan term: The term of the new mortgage (often 30, 20, or 15 years).
- Closing costs: Total costs to close the new loan (typically 2-3% of the loan amount).
The calculator compares your current monthly payment and total remaining interest against the new loan’s payment and total interest, factoring in closing costs to determine your true net savings and break-even timeline.
The Break-Even Formula
Break-Even Months = Total Closing Costs ÷ Monthly Payment Savings
For total savings analysis:
Net Savings = (Current Remaining Interest − New Total Interest) − Closing Costs
Each payment is calculated using the standard amortization formula, applied to the respective balance, rate, and term.
Step-by-Step Example
- Current loan: $290,000 balance, 7.0% rate, 27 years remaining
- Current monthly P&I: $1,973
- New loan: $290,000, 6.0% rate, 30-year term
- New monthly P&I: $1,738
- Closing costs: $6,500
Monthly savings: $1,973 − $1,738 = $235/month
Break-even point: $6,500 ÷ $235 = 28 months (2.3 years)
Remaining interest on current loan: ~$349,000
Total interest on new loan: ~$335,700
Net lifetime savings: $349,000 − $335,700 − $6,500 = $6,800
Note: The net savings appear modest because the new loan resets to 30 years. Refinancing into a 20-year term at 6.0% would yield higher monthly payments ($2,077) but save approximately $142,000 in total interest.
When Should You Use This Calculator?
- Rates have dropped 0.5%+ since your original mortgage: The traditional rule of thumb is that refinancing makes sense when rates drop by at least 0.5-0.75%, but this calculator gives you the exact numbers.
- Your credit score has improved significantly: A better score can qualify you for a much lower rate than when you originally purchased.
- You want to switch from ARM to fixed: If your adjustable rate is about to increase, locking into a fixed rate provides payment stability.
- You want to shorten your loan term: Refinancing from 30 to 15 years when rates are low can save hundreds of thousands in interest.
- You need cash for renovations or debt consolidation: A cash-out refinance lets you access home equity, though this increases your loan balance.
Tips for Getting Accurate Results
- Include ALL closing costs: Appraisal fees, title insurance, origination fees, and escrow prepaids can add up quickly. Get a Loan Estimate from your lender for exact figures.
- Compare same-term scenarios: Refinancing a 27-year remaining balance into a new 30-year loan can actually cost MORE in total interest despite a lower rate — always compare the total cost, not just the monthly payment.
- Consider your timeline: If you might sell within 3-5 years, the break-even point is critical. A refinance that breaks even in 28 months is great if you plan to stay 10+ years, but pointless if you are moving in 2 years.
- Watch out for “no-cost” refinances: These roll closing costs into the new loan or charge a higher rate to cover costs — you are still paying, just differently.
- Factor in the tax implications: Refinancing closing costs are generally not tax-deductible (unlike purchase mortgage points), which affects the true net cost.
Key Takeaways
- The break-even point is the most important metric — if you will stay in your home longer than the break-even period, refinancing is likely worth it.
- Dropping from 7.0% to 6.0% on a $290,000 loan saves $235/month, but extending the term back to 30 years can offset much of the lifetime savings.
- Refinancing into a shorter term (e.g., 30→20 or 30→15 years) is the most powerful way to reduce total interest costs — often saving $100,000-$200,000+.
- Always get quotes from at least 3 lenders — rate and closing cost differences between lenders can be substantial.
Frequently Asked Questions
How much can I save by refinancing my mortgage?
Savings depend on the rate difference, loan balance, and new term. For a $290,000 loan dropping from 7.0% to 6.0% on a 30-year term, you save about $235/month. Over 30 years that is $84,600 in payment savings, minus closing costs of roughly $6,500. However, if you refinance into a shorter term (like 20 or 15 years), the interest savings can exceed $100,000-$200,000 despite higher monthly payments.
What is the break-even point for refinancing?
The break-even point is the number of months it takes for your monthly savings to equal the closing costs of the refinance. Calculate it by dividing total closing costs by monthly payment savings. For example, $6,500 in closing costs with $235/month savings means a 28-month break-even. If you plan to stay in your home longer than 28 months, the refinance pays for itself and generates net savings going forward.
Should I refinance into a new 30-year or shorter term?
A new 30-year term lowers your monthly payment the most but can increase total interest if you are already several years into your current mortgage. A 15 or 20-year term has higher payments but dramatically reduces total interest. For most borrowers who can afford it, refinancing into a shorter term is the best long-term financial decision. You can also refinance into 30 years but make extra payments to effectively create your own shorter term with more flexibility.
When is refinancing not worth it?
Refinancing typically is not worth it if the rate drop is less than 0.25-0.50%, if you plan to sell within 2-3 years (before the break-even point), if your credit score has dropped significantly since your original mortgage, or if you would be extending the term and resetting the amortization clock on a loan that is already 10+ years into payments. Also avoid cash-out refinances for discretionary spending, as you are converting equity into debt.
What closing costs should I expect when refinancing?
Typical refinance closing costs range from 2-3% of the loan amount, which includes application fees ($200-$500), appraisal ($400-$700), title search and insurance ($700-$1,200), origination fees (0.5-1.0% of loan), recording fees ($50-$250), and prepaid escrow items. On a $290,000 refinance, expect $5,800-$8,700 in total closing costs. Some lenders offer “no-closing-cost” options that either roll costs into the loan or charge a slightly higher rate.