Finance category

Mortgage, loan, investing, tax, and money calculators.

Refinance Amortization Calculator

See the full lifetime impact of refinancing: monthly payment change, total interest saved (or added), and how much you've extended the loan term.

Current loan

Current balance

Current rate

Years remaining

New refinance loan

New rate

New term (years)

Closing costs (financed)

Lifetime interest saved

$12,460

net of new financed costs

New monthly payment

$1,748

vs current $1,960

Monthly savings

$213

Term extension

3 years

loan extended

How to read it

Refinancing usually adds years to the loan unless you intentionally pick a shorter new term. The lifetime interest saved figure already nets out the closing costs and any term extension. Break-even: 31 months to recover $6,500.

To save more interest, refinance into a shorter term (15- or 20-year) instead of resetting to 30. The payment will be higher but you'll save dramatically on lifetime interest.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Refinance Amortization Calculator is built to give a quick, browser-based estimate for refinance amortization. See the full lifetime impact of refinancing: monthly payment change, total interest saved (or added), and how much you've extended the loan term. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the refinance amortization result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this refinance amortization estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter your current balance, current rate, and years remaining.
Enter the new rate, new term, and closing costs being financed.
Compare the new payment to the current one and the lifetime interest impact.
Watch the term extension number — restarting a 30-year mortgage often extends total loan life.

Frequently Asked Questions

Why does my refinance increase total interest sometimes?

If you reset the term (e.g., 27 years remaining → new 30-year), you stretch out the principal payback over more time. Even at a lower rate, the longer schedule can produce more total interest.

How can I refinance without extending the term?

Choose a new term equal to your remaining years (or shorter). Many lenders offer custom terms — 17, 18, or 22 years instead of standard 15/20/30.

Should I roll closing costs into the new loan?

Common practice. The trade-off: zero cash needed at refi closing, but you pay interest on the closing costs over the loan life. If you have cash, paying out of pocket is cheaper long-term.

How does this differ from refinance break-even?

Break-even tells you how many months until monthly savings recoup closing costs. This calculator looks at full lifetime cost — including the term extension that break-even doesn't capture.