Calculator details
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%
%
years
years
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Your results
Estimated results based on the values and assumptions you entered.
Estimate
Calculator-specific details based on your current inputs
Formula & calculation method
Monthly savings = current payment − new payment; break-even = refinance costs ÷ monthly savings.
Formula version 3.0 · Intermediate calculations use full precision; displayed values are rounded for readability.
Compare the current mortgage with a proposed refinance using payment change, closing costs and break-even time.
Use Mortgage Refinance Calculator for the decision it actually answers
A lower rate can still be unattractive if fees are high or the new term resets the clock. Compare at the time you expect to keep the loan, not only over a fresh 30-year term.
For mortgage refinance calculator, separate the financing decision from the property decision. The loan determines principal and interest, while ownership costs and the time you expect to keep the home determine whether the monthly figure is realistic for this particular use case.
Inputs that change the mortgage refinance calculator result
Use Current loan balance, Current rate, New rate, New term, Refinance costs, and Remaining years on current loan as the working assumptions. The calculator returns Old Payment, New Payment, Monthly Savings, Break Even Months, Old Remaining Interest, New Total Interest, and Interest Difference. Enter figures from the same point in time and use one currency throughout; mixing an old balance with a new rate or a monthly figure with an annual figure can make an otherwise correct formula answer the wrong question.
For refinance calculator, make the inputs represent one coherent scenario. If you are comparing two alternatives, change one major variable at a time and keep the rest constant so the reason for the difference remains visible.
How the math works
Calculation used: Monthly savings = current payment − new payment; break-even = refinance costs ÷ monthly savings.
The formula converts the entered assumptions into the outputs shown above. For mortgage refinance calculator, the important point is to keep the rate, time unit and cash-flow timing consistent with the formula rather than treating the displayed percentage or payment as a standalone fact.
How to interpret the result without over-reading it
The result for mortgage refinance calculator can move sharply when the rate, property value, down payment or holding period changes. Use those inputs as deliberate stress tests rather than treating a default percentage as a forecast.
Quotes can include points, prepaid items and financed costs. Use the actual Loan Estimate or local equivalent for a final decision.
A better way to compare scenarios
Where this calculation can differ from real life
A housing calculation is strongest when it shows what is building equity and what is simply a cost. Read the mortgage refinance calculator output with that distinction in mind before comparing it with another housing option.
Quotes can include points, prepaid items and financed costs. Use the actual Loan Estimate or local equivalent for a final decision. Keep provider statements, tax rules, account rules or legal disclosures as the final authority whenever they apply.
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Authoritative references
Questions specific to mortgage refinance calculator
What decision should this result support?
A lower rate can still be unattractive if fees are high or the new term resets the clock. Compare at the time you expect to keep the loan, not only over a fresh 30-year term.
What can make the real-world number different?
Quotes can include points, prepaid items and financed costs. Use the actual Loan Estimate or local equivalent for a final decision.
What is the safest way to use the estimate?
Use the Mortgage Refinance Calculator to compare plausible scenarios, then verify the external inputs that control the decision. For this calculation, the most important discipline is to keep the inputs internally consistent and to avoid treating an assumed rate, future value or provider rule as guaranteed.