15 vs 30 Year Mortgage Calculator
Compare 15-year vs. 30-year fixed-rate mortgages side-by-side to evaluate monthly payment differences, interest savings, and equity buildup.
What this calculator does
The 15 vs 30 Year Mortgage Calculator estimates your result instantly from the values you enter, using standard mortgages formulas. Compare 15-year vs. 30-year fixed-rate mortgages side-by-side to evaluate monthly payment differences, interest savings, and equity buildup. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate for planning rather than financial advice.
15-Year vs. 30-Year Mortgage Calculator Results
Total Interest Saved with 15-Year
- 30-Year Monthly Payment —
- 15-Year Monthly Payment —
- Extra Monthly Cost (15-Year) —
- Total Interest (30-Year) —
- Total Interest (15-Year) —
What This Means
About 15 vs 30 Year Mortgage Calculator
The 15 vs 30 Year Mortgage Calculator provides a direct side-by-side comparison between 15-year and 30-year fixed home loans, illustrating the trade-off between higher monthly payments and massive lifetime interest savings.
Formula & Mathematical Calculation
Payment Difference = Monthly Payment (15-Year) - Monthly Payment (30-Year)
Total Interest Saved = Total Interest (30-Year) - Total Interest (15-Year)
Calculation Example
$300,000 Loan ($60k Down): 30-Yr Fixed @ 6.5% = $1,896.20/mo ($382,633 Total Interest). 15-Yr Fixed @ 5.75% = $2,491.14/mo ($148,405 Total Interest). 15-Year loan costs +$594.94/mo but SAVES $234,228 in interest and builds equity twice as fast!
Key Benefits
- Direct side-by-side financial comparison of 15-year and 30-year mortgages
- Calculates exact monthly payment differences and interest savings
- Shows equity buildup timelines and break-even milestones
- Helps buyers choose between cash flow flexibility and rapid debt elimination
- 100% free comparison tool
How to Use this Calculator
-
Enter Loan Amount
Input total mortgage loan principal. -
Specify 15-Year & 30-Year Interest Rates
Enter quoted interest rates for both terms. -
Compare Side-by-Side
Click Calculate to view comprehensive comparison table and charts.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Rates and contributions are assumed to stay constant for the whole period unless the form asks for them separately.
- Results use standard financial formulas and ignore fees, penalties and promotional terms that are not entered above.
- Inflation, tax changes and market volatility are not modelled unless a field for them is provided.
- Amounts are unit-agnostic: results are returned in the same currency you enter.
What it does not cover
- 15 vs 30 Year Mortgage Calculator produces estimates for education and planning, not a quote, offer or professional advice.
- Real-world outcomes differ when fees, taxes, rounding rules or provider-specific terms apply.
- Local regulations and tax rules vary by country and change over time; verify current rules for your jurisdiction.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For decisions with lasting financial impact, confirm the numbers with a qualified professional.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.
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Next step: browse the full Mortgages calculators or read the related guides for context before you decide.