What refinancing is
Refinancing replaces your current mortgage with a new loan — usually at a different rate, term, or loan amount. You pay off the old balance with proceeds from the new loan, so you end up with one mortgage at new terms rather than two.
The decision is a tradeoff between upfront closing costs and long-term savings. A lower rate, shorter term, or better structure only pays off if you keep the loan long enough for the savings to cover what you paid to get them.
How to use the Mortgage Refinance Calculator
Enter your current mortgage's remaining balance, rate, and years left. Enter the new loan's rate, term, and closing costs. The calculator returns the new monthly payment, the monthly savings, and the break-even month — how long you need to stay in the home before the refinance is a net win.
The break-even calculation
monthly_savings = old_monthly_payment − new_monthly_payment break_even_months = closing_costs / monthly_savings
Worked example:
Current loan: $300,000 remaining at 7.0%, 25 years left old payment ≈ $2,120/month New loan: $300,000 at 5.5%, 30 years new payment ≈ $1,703/month Monthly savings = $2,120 − $1,703 = $417 Closing costs = $6,000 Break-even = $6,000 / $417 ≈ 14.4 months If you'll stay >15 months, refinance pays. If you'll sell within a year, don't.
The break-even above ignores the fact that resetting to a 30-year term means more total interest over the life of the loan. A cleaner comparison matches terms (stay on a 25-year schedule or apply extra principal to match it).
When refinancing makes sense
| Situation | Rule of thumb |
|---|---|
| Rate drop | New rate ≥ 0.75 pp lower than current; bigger gap = faster payoff of costs |
| Credit score improved | A meaningful jump (e.g. from 650 → 740) unlocks better pricing tiers |
| Drop PMI | Equity now ≥ 20% — refinance ends private mortgage insurance |
| Shorten the term | Same rate + shorter term saves lifetime interest at a higher monthly |
| Switch ARM → fixed | Lock in when rates rise or an adjustment period is approaching |
| Cash-out | Replace high-rate unsecured debt with mortgage-rate debt (with caution) |
Closing costs to expect
Total closing costs typically run 2–6% of the new loan amount. On a $300k refi that's $6,000–$18,000. Major line items:
| Fee | Typical amount |
|---|---|
| Origination / lender fee | 0.5–1% of loan amount |
| Appraisal | $400–$800 |
| Credit report | $25–$75 |
| Title search & insurance | $700–$1,500 |
| Recording & transfer taxes | Varies by locality |
| Escrow / attorney (where required) | $500–$1,500 |
| Prepaid interest & escrow reserves | Varies |
"No-cost" refinances waive out-of-pocket fees but add them back as a higher rate. The math just shifts — you pay over time instead of at closing.
Types of refinance
| Type | What it does | When to use |
|---|---|---|
| Rate-and-term | Changes the rate, term, or both; balance stays the same | Rate has dropped, or you want a shorter term |
| Cash-out | Borrow more than the current balance; pocket the difference | Major expenses, debt consolidation |
| Cash-in | Pay down principal at closing to reach better pricing | Reduce LTV, drop PMI, qualify for lower rate |
| Streamline (FHA/VA/USDA) | Simplified refinance for government-backed loans | Lower rate on an existing FHA/VA loan with minimal paperwork |
Common mistakes
- Focusing only on the monthly payment. A lower monthly often hides a longer term, which means more lifetime interest. Compare total dollars too.
- Rolling closing costs into the loan and forgetting. Those costs still exist — you just pay them with interest over decades.
- Ignoring the break-even point. If you will sell or move within two years, almost no refinance pays off.
- Cashing out equity without a plan. Converting unsecured debt into debt secured by your home raises the stakes if something goes wrong.
- Not shopping lenders. Quotes vary by 0.25 pp or more on the same day. Get at least three.
Mortgage Refinance Calculator FAQ
- When does refinancing a mortgage make sense?
- The classic triggers are a rate drop of at least 0.75–1 percentage point, a material improvement in your credit score since you took the loan, a need to drop PMI because you now have 20% equity, or wanting to shorten the term (30 to 15). Always compare total lifetime cost, not just the monthly payment.
- How is the refinance break-even point calculated?
- Divide total closing costs by the monthly savings from the new loan: break-even months = closing costs ÷ (old monthly payment − new monthly payment). If you plan to stay in the home longer than the break-even point, refinancing pays off; sell earlier and the closing costs outweigh the savings.
- What are typical refinance closing costs?
- Plan on 2–6% of the loan amount. On a $300,000 refinance that is $6,000–$18,000 in origination, appraisal, title, escrow, and recording fees. Some are negotiable, some are not. No-cost refinances simply roll the fees into a higher rate — you pay over time either way.
- Should I refinance from a 30-year to a 15-year mortgage?
- If the new payment fits comfortably in your budget, a 15-year typically saves tens to hundreds of thousands in interest thanks to the lower rate and shorter term. The trade-off is a higher monthly payment and less flexibility. Compare to a 30-year with aggressive extra principal payments — the savings can be similar with more control.
- What is a cash-out refinance?
- You refinance into a larger loan than your current balance and pocket the difference as cash. Useful for home improvements, debt consolidation, or major expenses — but you are converting unsecured debt (if consolidating) into debt secured by your house, and restarting the amortization clock.
- Does refinancing hurt my credit score?
- A small, temporary dip is normal from the hard credit pull and the closed-and-reopened loan. Scores usually recover within a few months of on-time payments on the new loan. Shopping around? Multiple mortgage inquiries within ~14–45 days count as a single inquiry for scoring purposes.
- Can I refinance into a shorter term without raising my payment?
- Sometimes. If rates have dropped enough, a 15-year refinance can have a similar or only modestly higher payment than your current 30-year. Run the numbers both ways — the savings on a shorter, lower-rate term are usually significant even when the monthly is flat.
This tool is for planning, not financial advice. Get personalised quotes from licensed lenders before deciding.