Refinance Calculator

When refinancing makes sense

The old “rule of thumb” was that refinancing makes sense if you can lower your rate by at least 2 percentage points. That number came from the high-rate, high-fee era of the 1980s and is mostly obsolete. Today, with lower closing costs (and “no-closing-cost” refinances available), the more accurate rules are: 0.5-0.75% lower rate on a large loan, 1% lower rate on a moderate loan, and you should plan to stay in the home at least until the break-even point.

The arithmetic is simple. A refinance saves you money every month going forward, but costs you money upfront (closing costs). Those two have to cross somewhere — the break-even point. If you sell or refinance again before break-even, the refi loses money. After break-even, every month is pure savings. The calculator computes both numbers automatically.

Refinancing is most valuable when: market rates have dropped significantly since you took out your original mortgage, your credit score has improved (qualifying you for better rates), your home value has risen enough to remove mortgage insurance (PMI/LMI), you want to convert from an adjustable-rate to fixed-rate (or vice versa), or you want to shorten your loan term to save on total interest. It’s least valuable when you’re planning to move within 2-3 years, when closing costs are high relative to the rate improvement, or when you’ve already paid down a significant portion of the loan (most of the remaining payment is principal, so rate reductions save less interest).

The break-even rule (the critical concept)

Break-even is the number of months it takes for your monthly savings to add up to the closing costs you paid. It’s the single most important number in any refinance decision.

The formula is simple: Break-even months = Closing costs ÷ Monthly savings.

If you save $300/month and paid $6,000 in closing costs, your break-even is 20 months. Before month 20, the refi is in the red. From month 21 onward, every $300 of savings is pure benefit.

Three break-even ranges and what they mean

• Under 24 months: Excellent. Refinance is a clear win unless you’re literally planning to sell within 2 years.
• 24-48 months: Good. Refinance makes sense if you’ll stay in the home 4+ years.
• 48-72 months: Marginal. Only proceed if you’re confident you’ll stay 5+ years and the rate improvement is meaningful.
• Over 72 months: Probably not worth it. By the time you recover costs, you may be looking at another rate environment or another life change.

The fastest way to improve break-even is to reduce closing costs. Lenders compete heavily on refinances — get quotes from at least 3-4 lenders and ask each for a Loan Estimate. Negotiate origination fees, ask about lender credits (the lender pays some costs in exchange for a slightly higher rate), and consider whether “no-closing-cost” refis make sense for you (they typically charge a 0.125-0.25% higher rate in exchange for waived fees — sometimes worth it for short break-evens).

Rate-and-term vs cash-out refinance

Refinances come in two main flavors with very different financial implications.

Rate-and-term refinance

This is the “save money” refinance — you keep the same loan amount but get a better rate, shorter term, or both. Your loan balance stays the same; only the cost and timeline change. This calculator is built for rate-and-term refinances and is the type most homeowners pursue.

Within rate-and-term, you have two sub-decisions. Keep the same remaining term (e.g., 25 years left on the old loan, do 25-year refinance) — pure interest savings, no payment-relief tradeoff. Reset to a new 30-year term — lowers monthly payment significantly but stretches the loan, often costing more total interest despite the lower rate. Shorten the term (refi a 25-year remaining loan into a 15-year) — biggest interest savings, requires higher monthly payment, best for borrowers with growing income.

Cash-out refinance

Borrow more than you owe and pocket the difference in cash. If you owe $200K on a $400K home, you might refinance for $300K, pay off the existing $200K, and take $100K in cash. The new loan is bigger; your monthly payment may not actually go down even at lower rates.

Cash-out refinances make sense for major home improvements (which add to home value), debt consolidation (replacing high-rate credit card debt with low-rate mortgage debt), or large necessary expenses. They make less sense for discretionary spending, vacations, or general lifestyle inflation — you’re converting unsecured short-term debt into secured long-term debt against your home, and a job loss after a cash-out refi can put your home at risk.

Note: this calculator handles rate-and-term refinances cleanly. For cash-out refis, run two calculations: the rate-and-term portion (refinance the existing balance only) and separately the cost of the cash-out portion (the additional principal × the new rate over the new term).

What closing costs actually include

Refinance closing costs typically run 2-5% of the loan amount in the US, similar in most other markets. On a $300K refinance, expect $6,000-15,000 in costs. The major buckets:

• Origination fee (0-1.5% of loan): The lender’s profit margin on the loan. Most negotiable item.
• Discount points (0-3% of loan): Optional upfront payment to lower the rate. Each “point” = 1% of loan and typically reduces rate by ~0.25%. Worth it for long-hold loans, not for short-hold.
• Appraisal ($400-700): Required by the lender to verify home value. Not negotiable but you can sometimes use a recent appraisal.
• Title insurance ($500-2,000): Protects lender against title disputes. Required.
• Recording fees and transfer taxes (varies wildly): Government fees for updating the property records. State and county dependent.
• Credit report, processing, underwriting ($300-800 combined): Lender’s internal costs, often itemized separately.
• Escrow/prepaid items (varies): Property tax and insurance amounts deposited into escrow for the new loan. Not a true “cost” — you’d pay these anyway — but adds to the cash needed at closing.

The Loan Estimate document (US) or equivalent in your country itemizes every cost. Comparing Loan Estimates across 3-4 lenders is the single highest-ROI thing you can do as a refinancing borrower — rate spreads of 0.25% and cost spreads of $2,000-5,000 between similar lenders are normal.

Refinance Calculator FAQ

How much does it cost to refinance?

Typically 2-5% of the loan amount in closing costs. On a $300K refinance, that’s $6,000-15,000. Lower-cost options (“no-closing-cost” refis) exist but trade off with slightly higher rates. The break-even calculation tells you whether the cost is worth the savings — there’s no universal answer.

What credit score do I need to refinance?

Most US conventional refinances require 620+, but the best rates require 740+. FHA refinances allow 580+. Improving your credit before refinancing can shift you from a 6.5% rate to a 6.0% rate — on a $300K loan, that’s about $96/month or $35,000 over 30 years. Worth pausing 6 months to clean up credit if you’re below 700.

Can I refinance if I’m underwater?

“Underwater” means you owe more than the home is worth. Most standard refinances require some equity (typically 5-20%). The US has special programs (HARP successor programs) and some FHA refinances allow refinancing underwater loans. In other countries, options vary widely. Talk to a mortgage broker if you’re in this position.

What’s the difference between rate and APR?

Rate is the interest you pay on the borrowed amount. APR includes the rate plus origination fees, points, and other lender costs spread over the loan term. APR is always slightly higher than rate. For comparing lenders, use APR. For estimating monthly payments (as this calculator does), use the nominal rate.

Should I roll closing costs into the loan?

Most refinances let you finance closing costs (add them to the loan balance) instead of paying them at closing. The trade-off: no cash needed upfront, but you pay interest on the closing costs for the life of the loan. For short-hold refinances (under 5 years), rolling costs in is often optimal — the interest cost is small. For long-hold refinances (10+ years), paying upfront usually wins.

How often can I refinance?

There’s no legal limit, but most lenders impose a “seasoning period” (typically 6-12 months) before they’ll refinance a loan they already issued. Some loans (FHA, VA) have specific timing rules. The bigger constraint is closing costs — refinancing more than once every 3-5 years rarely pencils out unless rates move dramatically.

What if I’m planning to sell soon?

The break-even calculation answers this directly. If your break-even is 24 months and you’re selling in 36 months, you net 12 months of savings — usually worth it. If you’re selling in 18 months on a 24-month break-even, you lose money. Be conservative — selling timelines often slip later than expected.