Dallas Refinance Quote Comparison Calculator

This Dallas refinance quote comparison calculator estimates the monthly principal-and-interest payment and total interest for one proposed mortgage refinance, using the loan amount, APR, and term you enter. Compare its results with a second quote by running the calculator again with that quote’s figures; the calculation does not determine which offer fits your situation.

Formula

The calculator uses the standard fixed-rate, fully amortizing loan payment formula. It converts annual APR to a monthly rate, calculates the level payment, rounds that payment to the nearest cent, and multiplies it by the number of monthly payments to estimate total interest.

• p = amount borrowed for the refinance, in dollars.
• apr = annual percentage rate entered as a percentage, such as 6.5 for 6.5%.
• r = monthly rate, calculated as apr ÷ 1,200.
• n = number of monthly payments, calculated as years × 12.
• pmt = monthly principal-and-interest payment, in dollars.
• int = estimated total interest over the full term, in dollars.

The payment formula is pmt = round[p × r ÷ (1 − (1 + r)⁻ⁿ), 2]. Total interest is int = pmt × n − p. The second formula assumes the rounded monthly payment is made for every month and that the balance is fully repaid at the end of the stated term.

Worked Example

Using the calculator’s default values—$300,000 borrowed, 6.5% APR, and a 30-year term—the monthly rate is 0.065 ÷ 12 = 0.0054166667, and the term is 30 × 12 = 360 payments.

Substitute into the payment formula:

$300,000 × 0.0054166667 ÷ [1 − (1 + 0.0054166667)⁻³⁶⁰] = $1,896.20 per month, rounded to cents.

The estimated total of those payments is $1,896.20 × 360 = $682,632.00. Subtract the $300,000 principal: estimated total interest is $382,632.00.

Assumptions

• The APR and payment are fixed for the entire term.
• Payments are equal monthly payments, made at the end of each monthly period.
• Interest compounds monthly at APR ÷ 12.
• The estimate excludes lender charges, other closing costs, taxes, homeowners insurance, mortgage insurance, escrow, and any payoff amount or cash taken out beyond the entered loan amount.
• It assumes the loan runs for the full term; extra payments, missed payments, and early payoff are not modelled.

How to Compare Dallas Refinance Quotes

A refinance quote is an estimate of a new mortgage’s terms and costs, not simply a monthly payment. To compare offers serving a Dallas property, collect the same details from each quote and make sure each lender is pricing the same transaction: same proposed loan amount, term, rate structure, and cash-out amount, if any. A lower payment by itself does not establish that one quote costs less overall; a longer term can lower the payment while extending the time interest accrues.

1. Record each quote’s loan amount, APR, term, and whether the rate is fixed or adjustable.
2. Enter the amount, APR, and term in the calculator. Repeat for the other quote using its figures.
3. Compare the estimated principal-and-interest payments and full-term interest, keeping in mind that the outputs omit fees and escrow items.
4. Review each lender’s written estimate for costs, credits, cash required at closing, and any rate or payment conditions. Ask the lender to clarify differences rather than treating an estimate as a final disclosure.

For a meaningful comparison, also ask whether costs are paid upfront, added to the new balance, or offset by a lender credit. If costs are added to the balance, the new loan amount should reflect that when you use the calculator. If costs are paid separately, the calculator’s interest estimate does not include them, so it is not a complete measure of the refinance’s total cost.

What the Results Do—and Do Not—Show

The monthly payment shown is principal and interest only. A mortgage payment collected each month may also include amounts for property taxes, homeowners insurance, mortgage insurance, or escrow. Those items are not calculated here. Their amounts and collection arrangements depend on the property and loan; use the figures supplied by the lender or relevant providers when assessing a full monthly housing outlay.

The total-interest output assumes every scheduled payment is made and does not include charges paid to obtain or close the loan. Nor does it calculate the remaining balance at a particular date, a break-even period, or savings compared with keeping an existing mortgage. Those questions require additional inputs, including the current loan balance and terms, refinance costs, and how long the borrower expects to keep the loan. A refinance that restarts repayment over a longer term may show a smaller monthly payment yet more interest over the entire repayment period.

Common Comparison Problems

• Comparing different terms: A 15-year quote and a 30-year quote have different payment sizes and payoff timelines. Compare like terms first, or clearly account for the term difference.
• Using the wrong amount: The refinance principal may differ from the current mortgage balance if costs are financed or cash is taken out. Use the amount shown in the specific quote.
• Confusing rate with APR: The calculator’s input is APR, as labelled. If a quote provides both an interest rate and APR, use the APR for this estimate; check with the lender how its quoted figures are defined and what costs they include.
• Ignoring adjustable terms: The formula assumes one fixed rate throughout. It cannot represent a rate that may change after an initial period.
• Reading estimates as final figures: Rounding, payment dates, fees, and lender calculations can produce differences. The quote and final loan disclosures control the actual figures.

Frequently Asked Questions

How do I compare refinance quotes in Dallas?
Enter each quote’s loan amount, APR, and term, then compare the estimated payment and interest. Separately review closing costs, credits, escrow items, and whether costs are financed so that you are not comparing unlike estimates.

Does this calculator include Dallas property taxes?
No. It estimates principal and interest only. Property taxes, insurance, mortgage insurance, and escrow are not inputs and do not appear in the results.

Should I compare the interest rate or APR?
This calculator takes APR. A quote may display both an interest rate and an APR; confirm the figures and included costs with the lender, and use comparable quote details when running separate estimates.

Why can a refinance payment be lower but total interest higher?
A longer repayment term spreads the balance across more payments. That can reduce each scheduled payment while increasing the total interest paid over the full term.

Does the calculator show refinance closing costs or break-even time?
No. It has no cost input and does not calculate break-even time. To examine those, obtain itemized costs and compare them with the payment difference using the expected time in the loan; this calculator alone cannot establish the result.

This result is an estimate for educational use, and the lender’s disclosure gives the exact figures.

Related

• CW Title and Escrow Calculator: What It Estimates
• Escrow Analysis Calculator: Estimate Monthly Payments
• Home Refinance Costs: Estimate Your New Payment

in p | New loan amount | $ | 300000 | 1 | 100000000
in apr | Interest rate (APR) | % | 6.5 | 0.01 | 100
in yrs | Loan term | years | 30 | 0.0833 | 50
out pmt | Monthly principal-and-interest payment | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest over term | $ | pmt * yrs * 12 - p | 2