Loan Calculator: Know Your Payment Before You Borrow

Calculate monthly payments and total interest in seconds

min read
492 words
3/19/2026
Picture this: You're earning $75,000 a year and found a home priced at $350,000. You've saved a 20% down payment ($70,000), which means borrowing $280,000. But can you actually afford the monthly payment on a 30-year mortgage at 6.5% APR? That's where a loan calculator becomes essential. Instead of guessing or getting surprised at the closing table, you can see exactly what you'll pay each month—including total interest over the life of the loan. Whether you're financing a home, car, or personal expense, this tool helps you borrow with confidence and avoid financial overextension.

How to Use

Enter your loan amount (principal), annual interest rate (APR), and loan term in years. The calculator instantly displays your monthly payment, total interest paid, and overall cost. For example, a $280,000 mortgage at 6.5% over 30 years equals approximately $1,770 per month. Adjust the numbers to compare different scenarios before committing to any loan.

Pro Tips

Check your FICO score before applying—a score above 740 could qualify you for rates 0.5% lower, saving thousands over the loan's life. Follow the 28/36 rule: housing costs shouldn't exceed 28% of gross monthly income. At $75,000 annually, that's roughly $1,750 per month including taxes and insurance. Don't sacrifice your 401k contributions for a larger loan—your employer's 6% match is free money. Finally, run scenarios with extra payments. Adding just $200 monthly to your mortgage can shave seven years off a 30-year term and save over $90,000 in interest.

Common Mistakes to Avoid

First, many Americans focus only on the monthly payment and ignore total interest. On that $280,000 mortgage at 6.5%, you'll pay over $357,000 in interest across 30 years—more than the original loan. Second, forgetting escrow costs like property taxes, homeowner's insurance, and PMI if you put down less than 20%. These can add $300-$500 to your actual monthly payment. Third, not comparing loan terms. A 15-year mortgage has higher monthly payments but saves you six figures in interest compared to a 30-year term. Always run multiple scenarios before signing.

Frequently Asked Questions

How accurate is this loan calculator?

The calculator provides accurate estimates for principal and interest. However, your actual payment may include escrow for property taxes and insurance. For a $350,000 home, annual property taxes alone might add $250-$400 monthly depending on your state and county.

Should I choose a 15-year or 30-year mortgage?

A 15-year mortgage has higher monthly payments but saves massive interest. On a $280,000 loan at 6%, you'd pay approximately $290,000 total with a 15-year term versus over $605,000 with a 30-year term. Choose based on your monthly budget and long-term financial goals.

How does my credit score affect my loan rate?

Lenders use your FICO score to set your APR. A 760+ score might get you 6.5% APR, while a 620 score could mean 8% or higher. On a $280,000 30-year mortgage, that difference costs over $130,000 extra in interest over the life of the loan.

Try the Calculator

Ready to calculate? Use our free Loan Calculator calculator.

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