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
, ', svg: { fontCache: 'global' } };

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
]], displayMath: [['\\[','\\]']] }, svg: { fontCache: 'global' } };, svg: { fontCache: 'global' } };

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