Mortgage Refinance Calculator

Professional mortgage refinance calculator. Compare your current loan with a new rate and term, estimate new payment, monthly savings, break-even time, and lifetime interest savings. WCAG 2.1 AA, mobile-first.

Mortgage Refinance Calculator

Quickly evaluate whether refinancing could save you money. Enter your current loan and proposed new terms to estimate the new payment, monthly savings, break-even time, and lifetime interest savings.

Results

New payment
$0
Monthly savings
$0
Break-even time
—
Lifetime interest saved
$0
Current payment (est.): $0
New payment (P&I): $0
Costs financed: $0

Methodology & formulas

PI = r × L / (1 − (1 + r)^(−n)) with r = APR/12, n = months
MonthlySavings = PI_current − PI_new
BreakEvenMonths = Costs / MonthlySavings
InterestSaved ≈ Interest_current_remaining − Interest_new_total

Frequently asked questions

Is refinancing worth it if the rate drop is small?

Compare the monthly savings to your total closing costs. The shorter the break-even time, the more attractive the refi.

Should I reset to 30 years?

Lower payments come from longer terms; consider a 20- or 15-year refi to reduce total interest if the payment fits your budget.

Author: Ugo Candido. Reviewed by: Finance SME Team. Last updated: . Category: Finance › Mortgages.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
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Formula (extracted text)
PI = r × L / (1 − (1 + r)^(−n)) with r = APR/12, n = months MonthlySavings = PI_current − PI_new BreakEvenMonths = Costs / MonthlySavings InterestSaved ≈ Interest_current_remaining − Interest_new_total
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

Full original guide (expanded)

Mortgage Refinance Calculator

Quickly evaluate whether refinancing could save you money. Enter your current loan and proposed new terms to estimate the new payment, monthly savings, break-even time, and lifetime interest savings.

Results

New payment
$0
Monthly savings
$0
Break-even time
—
Lifetime interest saved
$0
Current payment (est.): $0
New payment (P&I): $0
Costs financed: $0

Methodology & formulas

PI = r × L / (1 − (1 + r)^(−n)) with r = APR/12, n = months
MonthlySavings = PI_current − PI_new
BreakEvenMonths = Costs / MonthlySavings
InterestSaved ≈ Interest_current_remaining − Interest_new_total

Frequently asked questions

Is refinancing worth it if the rate drop is small?

Compare the monthly savings to your total closing costs. The shorter the break-even time, the more attractive the refi.

Should I reset to 30 years?

Lower payments come from longer terms; consider a 20- or 15-year refi to reduce total interest if the payment fits your budget.

Author: Ugo Candido. Reviewed by: Finance SME Team. Last updated: . Category: Finance › Mortgages.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
PI = r × L / (1 − (1 + r)^(−n)) with r = APR/12, n = months MonthlySavings = PI_current − PI_new BreakEvenMonths = Costs / MonthlySavings InterestSaved ≈ Interest_current_remaining − Interest_new_total
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn

Mortgage Refinance Calculator

Quickly evaluate whether refinancing could save you money. Enter your current loan and proposed new terms to estimate the new payment, monthly savings, break-even time, and lifetime interest savings.

Results

New payment
$0
Monthly savings
$0
Break-even time
—
Lifetime interest saved
$0
Current payment (est.): $0
New payment (P&I): $0
Costs financed: $0

Methodology & formulas

PI = r × L / (1 − (1 + r)^(−n)) with r = APR/12, n = months
MonthlySavings = PI_current − PI_new
BreakEvenMonths = Costs / MonthlySavings
InterestSaved ≈ Interest_current_remaining − Interest_new_total

Frequently asked questions

Is refinancing worth it if the rate drop is small?

Compare the monthly savings to your total closing costs. The shorter the break-even time, the more attractive the refi.

Should I reset to 30 years?

Lower payments come from longer terms; consider a 20- or 15-year refi to reduce total interest if the payment fits your budget.

Author: Ugo Candido. Reviewed by: Finance SME Team. Last updated: . Category: Finance › Mortgages.

Audit: Complete
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
\[','\]
','
Formula (extracted text)
PI = r × L / (1 − (1 + r)^(−n)) with r = APR/12, n = months MonthlySavings = PI_current − PI_new BreakEvenMonths = Costs / MonthlySavings InterestSaved ≈ Interest_current_remaining − Interest_new_total
Variables and units
  • No variables provided in audit spec.
Sources (authoritative):
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
  • Initial audit spec draft generated from HTML extraction (review required).
  • Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
  • Confirm sources are authoritative and relevant to the calculator methodology.
Verified by Ugo Candido on 2026-01-19
Profile · LinkedIn
Formulas

(Formulas preserved from original page content, if present.)

Version 0.1.0-draft
Citations

Add authoritative sources relevant to this calculator (standards bodies, manuals, official docs).

Changelog
  • 0.1.0-draft — 2026-01-19: Initial draft (review required).