Personal finance learning tool
Mortgage Refinance Comparison Calculator
Compare the payment and remaining scheduled cost of a current mortgage with a refinance offer.
Inputs and results stay in this browser. Currency symbols are illustrative; use any consistent currency.
Understand Mortgage refinance
One idea, three depths
Choose how deeply to explain Mortgage refinance
Mortgage refinance: Compare the payment and remaining scheduled cost of a current mortgage with a refinance offer.
Age 5Explain it to a 5-year-oldStart with a picture
Imagine using Mortgage refinance to answer this question: compare the payment and remaining scheduled cost of a current mortgage with a refinance offer? Enter Balance to refinance, Current annual rate, New annual rate, and 2 other inputs; the calculator shows Monthly payment reduction. Try changing one number and watch what happens to Monthly payment reduction. The answer tells you Monthly payment reduction.
Age 15Explain it to a 15-year-oldConnect it to the formula
A lower payment may come from a lower rate or a longer term, so compare total scheduled cost as well as monthly cash flow. The rule is Monthly payment = principal × monthly rate ÷ (1 − (1 + monthly rate)^−months). Its input values are Balance to refinance, Current annual rate (%), New annual rate (%), Remaining term in months, Refinancing costs, and the main result is Monthly payment reduction. Try changing one number and watch what happens to Monthly payment reduction.
CollegeExplain it at college levelState the model precisely
This calculator evaluates a personal-finance model from stated cash amounts, rates and time assumptions. The implemented relation is Monthly payment = principal × monthly rate ÷ (1 − (1 + monthly rate)^−months), evaluated from Balance to refinance, Current annual rate (%), New annual rate (%), Remaining term in months, Refinancing costs to produce Monthly payment reduction. A lower payment may come from a lower rate or a longer term, so compare total scheduled cost as well as monthly cash flow. The result cannot predict markets or include unentered taxes, fees, legal rules, benefits, insurance terms or personal circumstances. Verify material decisions against current documents.
What this personal finance tool does
Compare the payment and remaining scheduled cost of a current mortgage with a refinance offer.
Why the relationship works
A lower payment may come from a lower rate or a longer term, so compare total scheduled cost as well as monthly cash flow.
The formula
Monthly payment = principal × monthly rate ÷ (1 − (1 + monthly rate)^−months)
Inputs and time periods
This model uses Balance to refinance, Current annual rate, New annual rate, Remaining term in months, Refinancing costs. Keep currencies and time periods consistent, and distinguish current known amounts from assumptions about future rates.
What the result means
The primary output is Monthly payment reduction; supporting outputs include Current-loan monthly payment, Refinanced monthly payment, Scheduled net savings after costs. Compare scenarios by changing one input at a time.
Limits of this compact model
This educational calculator cannot predict markets or account for every tax, fee, legal rule, benefit, insurance policy or personal circumstance. Verify material decisions with current documents and qualified advice.
Supporting sourcesAcademic referencesPrimary standards, textbooks and complete citations
Standards, reading and academic references
Use the calculator as the worked interaction, then consult the primary standards and academic textbooks listed below. MW SysArc links to the original sources; the explanation on this page is original and does not reproduce them.
Principles of Finance
Read the free OpenStax finance textbookCite this book
- APA 7
- Dahlquist, J., & Knight, R. (2022). Principles of finance. OpenStax. https://openstax.org/books/principles-finance/pages/1-why-it-matters
- MLA 9
- Dahlquist, Julie, and Rainford Knight. Principles of Finance. OpenStax, 2022, https://openstax.org/books/principles-finance/pages/1-why-it-matters.
- Chicago author-date
- Dahlquist, Julie, and Rainford Knight. 2022. Principles of Finance. Houston, TX: OpenStax. https://openstax.org/books/principles-finance/pages/1-why-it-matters.
OpenStax entries are free to read online. Follow the licence shown on each linked source before redistributing or adapting its content.
Reuse the page responsiblyCite this pageAPA, MLA, Chicago, Harvard, BibTeX and RIS
These formats cite this calculator page itself. They are separate from the academic references above, which support the mathematical method and terminology.
APA 7
MW SysArc. (2026, July 21). Mortgage Refinance Comparison Calculator. MW SysArc Tools. https://finance.mwsysarc.com/mortgage-refinance-comparison-calculator
MLA 9
MW SysArc. “Mortgage Refinance Comparison Calculator.” MW SysArc Tools, 21 July 2026, https://finance.mwsysarc.com/mortgage-refinance-comparison-calculator. Accessed 31 Aug. 2026.
Chicago 17
MW SysArc. “Mortgage Refinance Comparison Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 31, 2026. https://finance.mwsysarc.com/mortgage-refinance-comparison-calculator.
Harvard
MW SysArc (2026) ‘Mortgage Refinance Comparison Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://finance.mwsysarc.com/mortgage-refinance-comparison-calculator (Accessed: 31 August 2026).
BibTeX and RIS records
BibTeX
@misc{mwsysarc_mortgage_refinance_comparison_2026,
author = {{MW SysArc}},
title = {Mortgage Refinance Comparison Calculator},
howpublished = {MW SysArc Tools},
year = {2026},
url = {https://finance.mwsysarc.com/mortgage-refinance-comparison-calculator},
note = {Published July 21, 2026; accessed August 31, 2026}
}RIS
TY - ELEC
AU - MW SysArc
TI - Mortgage Refinance Comparison Calculator
T2 - MW SysArc Tools
PY - 2026
DA - 2026-07-21
Y2 - 2026-08-31
UR - https://finance.mwsysarc.com/mortgage-refinance-comparison-calculator
N1 - Published July 21, 2026
ER -Clear answers
Frequently asked questions
What does the Mortgage refinance do?
Compare the payment and remaining scheduled cost of a current mortgage with a refinance offer.
How does the Mortgage refinance work?
The calculator applies Monthly payment = principal × monthly rate ÷ (1 − (1 + monthly rate)^−months). A lower payment may come from a lower rate or a longer term, so compare total scheduled cost as well as monthly cash flow.
What can I learn from the Mortgage refinance?
You will connect Balance to refinance, Current annual rate, New annual rate, Remaining term in months, Refinancing costs to Monthly payment reduction, then test how changing one assumption affects the financial decision.
Does MW SysArc receive or store what I enter?
No. The calculation runs locally in your browser. MW SysArc does not receive or store your calculation inputs.
How should I use the result?
Use the result as a planning reference, and review how income, expenses, irregular payments, rates and time periods were classified before making decisions.
Last reviewed . Calculations tested .