Mortgage Rate Comparison Calculator
Compare two mortgage loan offers side-by-side. Calculate monthly payments, discount points break-even, total interest costs, and net lifetime savings.
Compare Mortgage Offers Side-by-Side
Enter total loan amount and parameters for Loan Option A vs Loan Option B.
Mortgage Offer Comparison Output
Quick Summary
Our compare mortgage rates monthly payment calculator lets home buyers and refinancers evaluate two competing mortgage quotes side by side. By comparing nominal interest rates, loan terms, and upfront discount points or origination fees, this calculator reveals which loan offer yields the lowest monthly payment and highest total lifetime savings.
How It Works: Comparing Mortgage Offers
Lender Loan Estimates often contain trade-offs: Option A may offer a higher interest rate with lower upfront closing costs, while Option B offers a lower interest rate achieved by paying upfront **discount points** (where 1 point equals 1% of the loan amount). This calculator computes monthly P&I payments for both options and calculates the **points break-even timeline** (how many months you must stay in the home for monthly interest savings to offset upfront points paid).
Formula Explanation
Monthly payments ($M_A, M_B$), monthly difference ($\Delta M$), and discount points break-even ($Months_{BE}$) are calculated as follows:
Where $r_A, r_B$ are monthly interest rates and $Fees_A, Fees_B$ are total upfront points and lender fees.
Step-by-Step Worked Example
Here is a detailed 5-step breakdown for a $350,000 home loan comparing Option A (6.75% APR, $3,500 fees) vs Option B (6.25% APR, $7,000 fees - buying 1 discount point) over 30 years:
- Step 1 (Calculate Option A Monthly Payment): At 6.75% APR, $M_A = \mathbf{\$2,270.20 / month}$.
- Step 2 (Calculate Option B Monthly Payment): At 6.25% APR, $M_B = \mathbf{\$2,155.00 / month}$.
- Step 3 (Determine Monthly Payment Savings): $\Delta M = \$2,270.20 - \$2,155.00 = \mathbf{\$115.20 / month}$ savings with Option B.
- Step 4 (Calculate Discount Points Break-Even): Extra upfront points fee $= \$7,000 - \$3,500 = \$3,500$. Break-even $= \$3,500 \div \$115.20 = \mathbf{30.4 \text{ months (2.5 years)}}$.
- Step 5 (Compute Net 30-Year Lifetime Savings): Option B saves **$37,872.00 in net lifetime costs** after deducting the extra upfront discount point fee!
Calculation Examples: Real-World Scenario Comparison
Compare common loan offer structures side-by-side for a $350,000 mortgage:
| Comparison Scenario | Option A Parameters | Option B Parameters | Monthly Payment Difference | Better Financial Choice |
|---|---|---|---|---|
| Zero Points vs 1 Discount Point | 6.75% (0 Points, $3.5k fee) | 6.25% (1 Point, $7.0k fee) | Option B saves $115.20 / mo | Option B (Break-even in 2.5 yrs) |
| 15-Year vs 30-Year Fixed Term | 6.75% (30-Yr Term) | 5.85% (15-Yr Term) | Option B is $820.50 / mo higher | Option B (Saves $278k interest) |
| Lender Credit vs Standard Rate | 6.75% ($0 Credit) | 7.00% ($3.5k Lender Credit) | Option A saves $57.50 / mo | Option B if keeping home <5 yrs |
| ARM vs 30-Year Fixed Rate | 6.75% (30-Yr Fixed) | 5.50% (7/1 ARM Initial) | Option B saves $281.40 / mo | Option B if moving before Year 7 |
Benefits of Using the Mortgage Rate Comparison Calculator
Utilizing this calculator provides essential shopping clarity when comparing lender Loan Estimates:
- Reveals True Total Loan Cost: Combines interest rates and upfront closing fees into one clear comparison metric.
- Tests Discount Point Buydowns: Shows whether paying extra upfront cash for a lower interest rate pays off based on your planned home ownership tenure.
- Compares 15-Year vs 30-Year Mortgages: Evaluates higher monthly payments against massive interest savings on shorter term loans.
- Empowers Lender Negotiation: Gives home buyers concrete mathematical leverage when shopping for competing quotes.
Frequently Asked Questions (FAQ)
What is the difference between interest rate and APR on a mortgage?
The interest rate is the base cost of borrowing the principal. APR (Annual Percentage Rate) includes the interest rate PLUS lender fees, points, and closing costs, reflecting true yearly cost.
What are mortgage discount points?
Discount points are upfront fees paid to the lender at closing in exchange for a permanently lower interest rate. 1 point equals 1% of the loan amount.
How do I calculate the break-even point when buying mortgage points?
Divide total upfront points cost ($) by monthly payment savings ($). For example, $3,500 points cost divided by $115 monthly savings = 30.4 months break-even.
Is it better to pay points or make a larger down payment?
If you plan to stay in the home for 5+ years, buying points often saves more interest. If you plan to move within 3 years, a larger down payment or keeping cash liquid is safer.
What is a lender credit on a mortgage quote?
A lender credit is money the lender gives you to cover closing costs in exchange for accepting a slightly higher interest rate.
How many mortgage quotes should I compare when shopping for a home loan?
Financial experts recommend obtaining official Loan Estimates from at least 3 to 5 lenders (banks, credit unions, online brokers) to ensure competitive rates.
Does comparing multiple mortgage quotes hurt my credit score?
No. Credit scoring models count multiple mortgage inquiries within a 14 to 45 day rate-shopping window as a single hard credit inquiry.
What is an official Loan Estimate document (Page 1 comparison)?
A Loan Estimate is a standardized 3-page form provided by US lenders within 3 days of application detailing interest rates, monthly payments, and total closing costs.
What is a temporary interest rate buydown (e.g. 2-1 buydown)?
A 2-1 buydown lowers your interest rate by 2% in Year 1 and 1% in Year 2 before returning to the full fixed rate in Year 3, funded by seller or builder concessions.
Should I choose a 15-year or 30-year mortgage rate offer?
Choose a 15-year mortgage if your budget easily handles higher monthly payments to save hundreds of thousands in interest. Choose a 30-year for maximum payment flexibility.