Compare Two Mortgage Offers
Enter values for Loan A and Loan B. This calculator estimates monthly payment, payoff time, total interest, and total loan cost (including fees).
Why use a home loan comparison calculator?
A mortgage is usually the largest debt most people ever take on. Even a small difference in interest rate, fees, or repayment strategy can add up to tens of thousands of dollars over the life of the loan. A home loan comparison calculator helps you evaluate options side by side, so you can make a decision based on numbers instead of marketing language.
Many offers look similar on paper. One lender might advertise a lower rate but charge higher points. Another might have slightly higher monthly payments but significantly lower total fees. Without a direct comparison, it is easy to pick the wrong option for your timeline.
What this calculator compares
This tool evaluates two loan scenarios and reports:
- Required monthly payment based on principal, rate, and term
- Payoff period if you make extra monthly payments
- Total interest paid over the life of each loan
- Total cost of each loan, including upfront fees/points
- Overall winner based on lower projected total cost
How the math works
Monthly mortgage payment formula
For fixed-rate loans, principal and interest are amortized. The payment formula is:
Payment = P × r × (1 + r)n / ((1 + r)n − 1)
Where P is loan amount, r is monthly interest rate, and n is total number of monthly payments.
Extra payments and payoff time
If you pay extra each month, more of your payment goes to principal. That reduces future interest because interest is charged on the remaining balance. The calculator simulates month by month until the balance reaches zero, so you can see how many months you save.
Fees matter too
A lower rate can still be a worse deal if fees are much higher and you do not keep the loan long enough. Always compare total cost, not just monthly payment.
How to interpret results like a pro
1) Start with monthly affordability
First, confirm the required payment fits comfortably in your budget. Do not stretch to a payment that leaves no room for maintenance, emergencies, or income disruptions.
2) Compare lifetime cost
Next, look at total interest and total cost. This shows the true long-term impact. A loan that costs $80 less per month can still be more expensive over 30 years if its rate is higher.
3) Consider your expected time in the home
If you expect to move or refinance in 5 to 7 years, high upfront points may not pay off. If you plan to stay for decades, buying down the rate may save more in the long run.
Common mistakes when comparing mortgage offers
- Focusing only on rate while ignoring points and lender fees
- Ignoring term differences (e.g., comparing 15-year and 30-year without context)
- Forgetting that extra monthly payments can dramatically reduce interest
- Using optimistic assumptions about future refinancing opportunities
- Not accounting for cash reserves after closing costs
Practical tips to lower total mortgage cost
- Improve credit score before applying to qualify for better pricing tiers
- Request Loan Estimates from multiple lenders on the same day
- Ask for zero-point and low-point alternatives to compare break-even periods
- Apply windfalls (bonuses, tax refunds) to principal when possible
- Review refinance opportunities only when the numbers clearly improve net cost
Frequently asked questions
Does this calculator include property taxes and insurance?
No. It focuses on principal, interest, and lender fees. Use it to compare loan structures, then add taxes, insurance, and HOA dues for a full monthly housing budget.
Can I compare different loan amounts?
Yes. You can enter different principal values for Loan A and Loan B. This can be useful if one option includes financed fees or different down-payment assumptions.
What if interest rates are variable?
This tool assumes fixed rates for both options. Adjustable-rate loans require scenario analysis over multiple rate paths. Use conservative assumptions if evaluating ARMs.
Final thought
The best mortgage is not always the one with the lowest advertised rate. The best mortgage is the one that aligns with your budget, timeline, and long-term financial goals. Run multiple scenarios before signing. A few minutes of comparison now can save years of payments later.