Mortgage Rate Calculator

This mortgage rate calculator compares different rates side by side. Enter loan amount and rates to see monthly payment and total interest differences instantly.

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Compare up to 4 different interest rates side-by-side. See how even a 0.25% difference can save thousands over the life of your loan.

Rate Comparison Results
📊 Compare Mortgage Rates Side-by-Side
Metric Rate 1 Rate 2 Rate 3 Rate 4
Year-by-Year Balance Comparison
YearRate 1 BalanceRate 2 BalanceRate 3 BalanceRate 4 Balance

Enter loan details to view comparison schedule.

Shows year-by-year remaining balance for each interest rate scenario.

Powered by Techraxy | Mortgage Rate Calculator

Creator & Reviewer

Hasnain Khan

Co-Founder, Techraxy

Hasnain Khan is a digital tools developer and Co-Founder of Techraxy, a platform dedicated to building modern web-based calculators and utility tools. He focuses on tool optimization, website performance, and creating accessible user experiences across categories like automotive, finance, construction, and everyday utilities.

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Introduction to Mortgage Rate Calculator

Your mortgage interest rate is one of the most important factors in determining your monthly payment and total loan cost. Even a small difference in rates can mean thousands of dollars in savings or extra costs over the life of your loan. For example, on a $300,000 loan, a 0.5% rate difference can change your monthly payment by $90 and total interest by over $30,000. This Mortgage Rate Calculator helps you compare different interest rates side by side. Enter your loan amount, term, and up to three different rates. The calculator shows your monthly payment, total interest, and total payments for each rate. You can see exactly how much a lower rate saves you and decide whether paying points or shopping for a better rate is worthwhile. Toolraxy built this calculator to help borrowers understand the true impact of mortgage rates on their budget.

How to Use This Mortgage Rate Calculator

            1. Enter your Loan Amount (principal borrowed)

            2. Enter Rate 1 (your current rate or first offer)

            3. Enter Rate 2 (compare with another offer)

            4. Enter Rate 3 (optional – compare a third option)

            5. Select the Loan Term (15 or 30 years typical)

            6. Enter Annual Property Tax (optional – for complete payment)

            7. Enter Annual Home Insurance (optional – for complete payment)

            8. Click Calculate to see side-by-side rate comparison

Formula Section

Monthly payment at each rate:

Monthly Payment = Loan Amount × [ r(1+r)^n ] / [ (1+r)^n – 1 ]

Total interest at each rate:

Total Interest = (Monthly Payment × n) – Loan Amount

Total payments at each rate:

Total Payments = Monthly Payment × n

Monthly property tax (if included):

Monthly Tax = Annual Property Tax ÷ 12

Monthly home insurance (if included):

Monthly Insurance = Annual Home Insurance ÷ 12

Total monthly payment (with taxes and insurance):

Total Monthly Payment = Monthly Payment + Monthly Tax + Monthly Insurance

Payment difference between rates:

Rate Difference = |Monthly Payment at Rate 1 – Monthly Payment at Rate 2|

Interest savings between rates:

Interest Savings = |Total Interest at Rate 1 – Total Interest at Rate 2|

Where:

  • r = Monthly interest rate (annual rate ÷ 12 ÷ 100)

  • n = Total months in loan term (years × 12)

Real-Life Examples Section

  • Example scenario:

    • Loan amount: $350,000

    • Loan term: 30 years

    • Property tax (annual): $4,200

    • Home insurance (annual): $1,500

    Results:

     
    RateMonthly P&IMonthly TaxMonthly InsuranceTotal MonthlyTotal Interest
    6.25%$2,155$350$125$2,630$425,000
    6.75%$2,270$350$125$2,745$467,000
    7.25%$2,388$350$125$2,863$510,000

    Comparisons:

    • 6.25% vs 6.75%: Saves $115/month** and **$42,000 in total interest

    • 6.25% vs 7.25%: Saves $233/month** and **$85,000 in total interest

    • 6.75% vs 7.25%: Saves $118/month** and **$43,000 in total interest

    Clear takeaway: On a $350,000 loan, each 0.5% rate increase adds approximately $115 to your monthly payment and $40,000 to total interest. Shopping for the best rate is one of the most important financial decisions you can make.

 

FAQs

1. How do mortgage rates affect my payment?
Your mortgage rate directly determines your monthly payment. A higher rate means a higher monthly payment and more total interest over the loan term. Even a 0.25% difference can change your payment by $40-$50 per $100,000 borrowed.

2. What is a good mortgage rate?
A good mortgage rate depends on current market conditions, your credit score, down payment, and loan type. For 2025, rates between 6-7% are common for qualified buyers. Check current rates before applying.

3. How much does a 0.5% rate difference save?
On a $300,000 30-year loan, a 0.5% rate difference saves approximately $90 per month and $30,000 to $35,000 in total interest over the life of the loan. The exact savings depends on loan amount and term.

4. Should I pay points to lower my rate?
Paying points lowers your rate but costs upfront. Calculate your break-even point. If you plan to stay beyond break-even, points may be worthwhile. Use our Mortgage Points Calculator to decide.

5. How do I get the best mortgage rate?
Shop multiple lenders, improve your credit score (aim for 740+), make a larger down payment (20%+), choose a shorter loan term (15 years), and consider buying points. Compare rates from at least 3 lenders.

6. How are mortgage rates determined?
Mortgage rates are influenced by economic factors (inflation, Federal Reserve policy, Treasury yields), your credit score, down payment, loan amount, loan term, and market competition among lenders.

7. Does my credit score affect my mortgage rate?
Yes. Higher credit scores qualify for lower rates. A 740+ score typically gets the best rates. A 620-679 score may face rates 0.5-1% higher. Improving your score before applying can save thousands.

8. What is the difference between fixed and adjustable rates?
Fixed rates stay the same for the entire loan term. Adjustable rates (ARMs) start with a fixed period (3, 5, 7 years) then adjust periodically. Fixed rates provide predictability; ARMs offer lower initial rates.

Disclaimer

This Mortgage Rate Calculator is provided for educational and planning purposes only. Results are based on standard amortization formulas and the numbers you enter. Actual mortgage rates depend on your credit score, down payment, loan type, lender policies, and current market conditions. This tool does not constitute financial or mortgage advice. Consult a licensed mortgage lender for a personalized rate quote. Toolraxy is not responsible for any actions taken based on these calculations.

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