Mortgage Rate & Payment Comparison Calculator
A slight change in interest rate has a massive compounding impact on total interest paid over a 30-year mortgage term.
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<iframe src="https://calcusolve.com/calculator/mortgage-rate-calculator?embed=true" width="100%" height="600" frameborder="0" loading="lazy" title="Mortgage Rate & Payment Comparison Calculator"></iframe> ⚖ Scenario Comparison
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📐 Formula
💡 Practical Example
Comparing a 6.75% rate vs a 6.00% rate on a $350,000 30-year mortgage. - Option A (6.75%): $2,270.21/month ($467,275.60 total interest). - Option B (6.00%): $2,098.43/month ($405,433.47 total interest). - Monthly Payment Savings: $171.78/month. - Lifetime Interest Saved: $61,842.13.
📖 About Mortgage Rate & Payment Comparison Calculator
A slight change in interest rate has a massive compounding impact on total interest paid over a 30-year mortgage term.
To use the Mortgage Rate & Payment Comparison Calculator, enter your Mortgage Loan Amount, Option A Rate (e.g. 6.75%), Option B Rate (e.g. 6.00%) and other values. The calculator instantly computes Option A Monthly Payment (P&I), Option B Monthly Payment (P&I) and more. Results update in real time as you change any input — no submit button needed.
How to Use This Calculator
Enter your Mortgage Loan Amount (e.g. 350000 in ), Option A Rate (e.g. 6.75%) (e.g. 6.75 in %), Option B Rate (e.g. 6.00%) (e.g. 6.00 in %), and Loan Term — choose from 30 Years, 15 Years. Results update instantly as you type — adjust any value to compare scenarios.
The Formula
Monthly Payment = Loan Amount × [r(1+r)^n] / [(1+r)^n - 1]
Monthly Savings = Option A Payment - Option B Payment
Lifetime Interest Saved = Total Option A Interest - Total Option B Interest
Worked Example
Comparing a 6.75% rate vs a 6.00% rate on a 350,000 30-year mortgage.
- Option A (6.75%): 2,270.21/month (467,275.60 total interest).
- Option B (6.00%): 2,098.43/month (405,433.47 total interest).
- Monthly Payment Savings: 171.78/month.
- Lifetime Interest Saved: 61,842.
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Understanding Your Result
Lenders use two DTI ratios: front-end (housing costs ÷ gross income) must be below 28% for conventional loans; back-end (all debts ÷ gross income) must be below 43%. Down payment below 20% triggers PMI (0.5–1.5% of loan balance annually). 20% down is the break-even point where PMI savings offset the reduced loan balance benefit. Every 1% rise in mortgage rate reduces buying power by approximately 10% for the same monthly payment.
💡 Real Estate: Financial & Legal Considerations
- Real estate calculations assume stable market conditions. Actual values, tax rates, and income are volatile — recalculate quarterly for active decisions.
- The Consumer Financial Protection Bureau (CFPB) provides free homebuyer resources. Obtain a professional appraisal before any major transaction.
- Factor all carrying costs: property taxes (avg 1.1% nationally), insurance (0.5–1%), HOA, maintenance (1–2% of value annually), and vacancy rates.
- Mortgage qualification requires reviewing DTI ratio, credit score (min 620 for conventional, 580 for FHA), employment history, and liquid reserves.
- Closing costs typically range 2–5% of the purchase price in the US. Budget for these separately — they are not included in down payment calculations.
- The 28/36 qualifying rule: housing costs should not exceed 28% of gross income; total debt should not exceed 36% for conservative underwriting.
- Investment property returns must account for management fees (8–12%), turnover costs, and capital expenditure reserves — not just gross rent.
- Real estate is illiquid. Always maintain separate liquid emergency reserves independent of any property investment or equity.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.