Refinance Calculator

Refinance Calculator

Refinancing replaces your existing mortgage with a new loan, ideally at a lower rate, shorter term, or both. This calculator computes your new monthly payment, monthly savings, and the break-even point — the number of months until cumulative savings offset your closing costs. If you plan to move before that date, refinancing will cost more than it saves.

How Refinance Savings Are Calculated

The calculator uses the standard amortization formula on both your current and proposed loan:

Monthly Payment = P x [r(1+r)^n] / [(1+r)^n - 1]

Where P is the remaining principal, r is the monthly interest rate, and n is the remaining months. From there:

• Monthly Savings = Current Payment — New Payment
• Break-Even Point = Total Closing Costs / Monthly Savings (expressed in months)
• Lifetime Savings = (Remaining interest on current loan) — (Total interest on new loan + Closing Costs)

Note: if you refinance into a longer term, your monthly savings may look appealing but your lifetime interest cost can actually increase — always check both figures.

Worked Examples

Scenario 1 — Rate-and-term refinance: $280,000 balance, 7.0% to 6.0%, 30 years remaining, $5,200 closing costs Old payment: $1,863/month. New payment: $1,679/month. Monthly savings: $184. Break-even: 28 months. If you stay 5+ years, total savings reach roughly $56,700 after recovering closing costs.

Scenario 2 — 30-year to 15-year: $220,000 balance, 6.5% to 5.75%, $4,500 closing costs Old payment: $1,392/month. New 15-year payment: $1,826/month — $434 higher each month. However, total interest on the 15-year loan is $108,600 vs. $247,000 remaining on the original — a lifetime savings of approximately $133,900 despite the higher payment.

Scenario 3 — Cash-out refinance: $300,000 balance, 7.25%, new loan $380,000 at 6.5%, $7,000 closing costs Old payment: $2,047/month. New payment: $2,402/month — $355 more. Total cash received: $80,000 (for home renovation). This scenario has no break-even in the traditional sense — the trade-off is $355/month more in exchange for $80,000 now, at a rate lower than most personal loans or credit cards.

Refinance Scenario Reference Table

When to Use This Calculator

• You have seen rates drop at least 0.5-0.75% below your current rate and want to know if it pencils out
• You are considering switching from a 30-year to a 15-year loan to accelerate payoff and reduce total interest
• You want to pull cash out for home improvements and need to compare the cost of a cash-out refi against a HELOC
• Your ARM (adjustable-rate mortgage) is approaching its adjustment date and you want to lock in a fixed rate
• You want to eliminate FHA mortgage insurance by refinancing into a conventional loan once you have 20% equity

Common Mistakes

1. Looking only at monthly savings without checking the break-even point. A refinance that saves $200/month but costs $8,000 in closing costs takes 40 months to break even. If you sell or refinance again before then, you lose money on the transaction.
2. Ignoring the total interest cost when extending the term. Refinancing 18 years remaining on your loan into a fresh 30-year term at a lower rate can actually increase your total interest paid even though your payment drops. Always compare total cost, not just monthly payment.
3. Forgetting that no-closing-cost refinances have a higher rate. Rolling closing costs into the loan or accepting a higher rate in exchange for a lender credit means you pay those costs through interest over time — typically costing more if you stay long-term.
4. Not locking the rate promptly. Rates can move 0.125-0.25% in a single day. Once you decide to refinance, request a rate lock immediately after applying. A 30-45 day lock covers most standard closings.

Current Market Context for 2026

The 30-year fixed rate averaged around 6.7-6.9% in early 2026. This means borrowers who locked in rates of 7.25-7.75% in late 2022 and 2023 can now realistically break even within 24-30 months on a rate-and-term refi — a reasonable window for most homeowners who plan to stay put. Borrowers at 5.0% or below from 2020-2021 still have no financial incentive to refinance for rate reduction alone. The most active refinance market in 2026 involves homeowners trading from FHA to conventional (to eliminate lifetime MIP) and ARM borrowers looking to lock in fixed rates before potential volatility.

Tips

1. Request loan estimates from at least three lenders — rates and fees vary enough that comparison shopping on a $350,000 refinance can save $3,000-$5,000 in closing costs
2. Watch your credit score in the 60 days before applying — avoid opening new credit accounts or making large purchases that raise your utilization ratio
3. If your home has appreciated, request an appraisal; a higher appraised value improves your loan-to-value ratio and can qualify you for better rates
4. Ask each lender for the same loan structure (same term, same loan amount) so you are comparing apples to apples across quotes
5. Consider a 20-year loan if a 15-year payment is too high — you get most of the interest savings at a more manageable payment
6. Keep records of your closing costs and the refinance date in case you sell within a few years — it affects your capital gains calculation

Related Calculations

• Mortgage Payment Calculator: Build a baseline payment before comparing refinance scenarios
• Mortgage Payoff Calculator: Compare refinancing against simply making extra payments on your current loan
• 15 Year Mortgage Calculator: See what a 15-year refinance payment would look like at current rates
• Amortization Calculator: Review how much principal you have actually paid down before deciding to refinance
• Home Equity Calculator: Check your equity position to determine if you can avoid PMI or access cash-out