🔄 Mortgage Refinance Calculator: Break-Even & Savings

Will a lower rate pay off? See your break-even month.

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Formula at a glance

Refinance Calculator: Break-even (months) — refinance costs ÷ monthly saving. Example: $300,000 from 7% to 6%, $4,000 costs → Monthly saving: $191.49
How the Refinance Calculator works: Break-even (months) — refinance costs ÷ monthly saving

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📘 About the Refinance Calculator

Refinancing replaces your mortgage with a new one, usually to get a lower rate. It costs money — typically 2–5% of the loan in the US, or arrangement and legal fees elsewhere — so it only pays off after the break-even point.

Break-even = costs ÷ monthly saving. Watch the term: restarting a 30-year loan lowers the payment but can increase total interest.

🧮 Formula

Break-even (months)
refinance costs ÷ monthly saving

✏️ Worked examples

$300,000 from 7% to 6%, $4,000 costs

You enter
Current loan balance300000
Current interest rate7%
Years left on current loan27 years
New interest rate6%
New loan term27 years
Refinance costs4000
Add costs to the new loan?No
Currency$ Dollar
You get
Monthly saving$191.49
New payment$1,871.96 (now $2,063.44)
Break-even21 months
Lifetime interest changeSave $58,042
Interest left on current loan$368,556
Interest on new loan$306,514

$191.49 a month; break-even 21 months.

£200,000 from 5.5% to 4.5%

You enter
Current loan balance200000
Current interest rate5.5%
Years left on current loan20 years
New interest rate4.5%
New loan term20 years
Refinance costs1500
Add costs to the new loan?No
Currency£ Pound
You get
Monthly saving£110.48
New payment£1,265.30 (now £1,375.77)
Break-even14 months
Lifetime interest changeSave £25,014
Interest left on current loan£130,186
Interest on new loan£103,672

£110.48 a month.

🧭 How to use this calculator

What you enter

  • Current loan balance
  • Current interest rate (%)
  • Years left on current loan (years)
  • New interest rate (%)
  • New loan term (years)
  • Refinance costs
  • Add costs to the new loan?
  • Currency

What you get

  • Monthly saving
  • New payment
  • Break-even
  • Lifetime interest change
  • Interest left on current loan
  • Interest on new loan

❓ Frequently asked questions

When is refinancing worth it?

When you will stay in the home longer than the break-even period and the new rate is meaningfully lower — often 0.75–1 point or more.

How much does it cost to refinance?

In the US usually 2–5% of the loan amount; in the UK often £0–£1,500 in fees plus any early repayment charge.

Does refinancing reset my loan term?

It can — choose a shorter term to keep the payoff date.

Can I refinance with bad credit?

Possibly, but the rate offered may not save enough to make it worthwhile.