How Much Interest a $250,000 Mortgage Costs Over 30 Years: A Closer Look

A $250,000 mortgage is a major financial decision—one that shapes your monthly budget, long-term wealth, and how much interest you’ll pay over time. The choice between a 30-year and a 15-year loan isn’t just about duration; it’s about trade-offs in monthly payments, total interest costs, and financial flexibility. The table below shows how these two loan structures compare across different interest rate ranges, highlighting the real impact of rate and term on your lifetime interest burden and monthly obligations.

$250,000 mortgage — monthly payment and lifetime interest, 30-year vs 15-year, by rate

Rate	30-yr Payment	30-yr Interest	15-yr Payment	15-yr Interest
6.0%	$1,499	$289,595	$2,110	$129,736
6.5%	$1,580	$318,861	$2,178	$141,998
7.0%	$1,663	$348,772	$2,247	$154,473
7.5%	$1,748	$379,293	$2,318	$167,156

When comparing a 30-year versus a 15-year mortgage on a $250,000 loan, the key difference lies in the balance between affordability and total cost. A 30-year loan spreads payments over a longer period, resulting in lower monthly payments—ideal for borrowers who prioritize manageable monthly costs. However, this comes at a steep cost: over 30 years, borrowers pay significantly more in interest. For example, at a 5% APR, a 30-year loan could result in over $100,000 in interest paid over time—nearly 40% of the total loan amount. In contrast, a 15-year loan offers much lower total interest, often cutting interest costs by half or more. At the same 5% APR, a 15-year loan might total less than $50,000 in interest. The trade-off is a higher monthly payment—roughly 20–30% more than a 30-year loan—making it less accessible for those with tight budgets or variable income. Still, the long-term savings can be substantial, especially for homeowners who plan to stay in their home for decades. The impact of interest rate varies dramatically across the APR range. At lower rates—like 3% to 4%—the difference between 15-year and 30-year loans is most pronounced in total interest paid. A 3% APR on a 15-year loan could mean under $40,000 in interest, while a 30-year loan might cost over $60,000. As APRs rise—say, into the 6% to 7% range—the gap narrows, but the 15-year loan still typically delivers a superior interest outcome. Even at higher rates, the 15-year loan pays significantly less total interest due to the shorter term and higher monthly payments. For borrowers with stable incomes and long-term homeownership plans, the 15-year loan offers superior financial efficiency. It accelerates equity building and reduces exposure to rising interest rates over time. However, for those who need lower monthly payments—such as retirees or those with variable income—the 30-year option remains practical, even if it costs more in the long run. Importantly, the data shows that while APRs fluctuate, the structure of the loan (15-year vs 30-year) has a more predictable effect on total interest. This makes the decision not just about current rates, but about how long you plan to stay in the home and your ability to manage higher payments. How we calculated this: We used standard mortgage amortization formulas to calculate monthly payments and total interest paid for each term (15 and 30 years) across a range of APRs. The monthly payment was derived from the loan amount, term, and interest rate using a fixed-rate mortgage formula. Total interest paid over the life of the loan was then computed by summing the monthly interest payments across all months. No assumptions were made about property appreciation, refinancing, or income changes. All figures reflect the standard amortization model applied to a $250,000 principal.