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Treasure Tools

Loan Calculator

Calculate loan payments, interest rates, and amortization schedules online. Free loan calculator for mortgages and personal loans.

Calculators
Instant results
Monthly Payment
$1,580.17
Total Payment
$568,861.22
Total Interest
$318,861.22

How to Use Loan Calculator

1

Enter loan details

Input principal (loan amount), annual interest rate (APR), and loan term in years (or months for short-term loans).

2

View payment breakdown

See monthly payment, total amount paid over loan, and total interest. The amortization schedule shows interest vs principal for each payment.

3

Compare scenarios

Try different terms (15-year vs 30-year mortgage), rates (refinance simulation), or extra payments. The calculator updates instantly to show the impact.

4

Plan for full PITI

For mortgages, add property taxes and homeowners insurance separately to estimate full monthly housing cost (basic loan calc only handles principal+interest).

When to Use Loan Calculator

Mortgage planning

Compare different mortgages: 15-year vs 30-year, 4.5% vs 7%, $300k vs $400k loan. Each combination produces different monthly payments and total interest. Critical for first-time buyers and refinance decisions — shows the impact of rate, term, and amount on total cost.

Auto loan comparison

When buying a car, the dealer's monthly payment may sound great but the total cost differs based on rate and term. Compute total interest for different scenarios. Sometimes a higher monthly with shorter term saves thousands in interest.

Personal loan and credit card payoff

Calculate how long to pay off credit card debt at minimum vs. higher payments. Or model personal loan offers (consolidation loans). The amortization schedule reveals how much of each payment goes to principal vs interest — eye-opening for high-interest debt.

Student loan repayment planning

Federal student loans offer different repayment plans (10-year standard, 25-year extended, 20-year IBR). Each affects monthly payment and total interest dramatically. Calculate to choose the right balance of monthly affordability and total cost.

Loan Calculator Examples

Standard mortgage

Input
Principal: $300,000\nRate: 6.5%\nTerm: 30 years
Output
Monthly: $1,896.20\nTotal paid: $682,632\nTotal interest: $382,632

On a $300k mortgage at 6.5% over 30 years, you pay nearly $383k in interest — more than the original principal. Higher rates dramatically increase total cost. Worth shopping for the best rate.

Shorter term comparison

Input
Same loan, 15-year term
Output
Monthly: $2,613.32 (higher)\nTotal: $470,398\nInterest: $170,398 (much lower)

Same $300k at 6.5% over 15 years saves $212k in interest vs 30-year, despite higher monthly payment. If you can afford the higher payment, shorter terms save enormous money over the life of the loan.

Auto loan

Input
Principal: $30,000\nRate: 7%\nTerm: 5 years
Output
Monthly: $594.04\nTotal: $35,642\nInterest: $5,642

Standard 5-year auto loan. Total interest is about 19% of principal — significant but typical. Shorter term (3 years) reduces interest; longer (7 years, common for new cars) increases it but makes monthly more affordable.

Tips & Best Practices for Loan Calculator

  • 1.Always compare APR (Annual Percentage Rate, including all fees) not just interest rate. APR gives the true cost of borrowing including origination fees, closing costs, etc.
  • 2.Pay extra to principal when possible. Even small extras saved thousands on long-term loans. Make sure your loan agreement allows extra payments without penalty (some have 'prepayment penalties').
  • 3.For mortgages, 15-year vs 30-year is a big decision. 15-year saves enormous interest but higher monthly payment. 30-year easier to afford but costs much more total. Calculate both.
  • 4.Consider the rate environment. If rates are low (historically), longer terms make sense (lock in low rate). If high, shorter terms may make sense (refinance when rates drop).
  • 5.Down payment affects loan amount and monthly cost dramatically. 20% down avoids PMI (Private Mortgage Insurance, ~0.5-1% of loan value annually). The calculator shows just the loan; factor in PMI separately if applicable.
  • 6.Use the amortization schedule to plan major life events. If you're considering moving in 7 years, see how much principal you'd have paid down by then — informs whether buying vs renting makes sense.

Frequently Asked Questions

Given a loan amount (principal), annual interest rate, and loan term (in years), it calculates: monthly payment, total amount paid over the loan, total interest paid, and provides an amortization schedule showing payment breakdowns over time. Essential for evaluating mortgages, auto loans, personal loans, and student loans.

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