Understanding Interest Rates
Learn how interest rates work, the difference between fixed and variable rates, and how they affect your loan payments.
Read MoreCalculate your loan payments, interest, and amortization schedule with our easy-to-use tool.
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Enter loan details and click "Calculate" to see results
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Our loan calculator uses standard financial formulas to compute your loan payments, total interest, and amortization schedule. Here's how it works:
The calculator uses the following formula to determine your fixed monthly payment (PMT):
PMT = P × (r × (1 + r)^n) / ((1 + r)^n - 1)
Where:
The amortization schedule breaks down each payment into principal and interest components:
Interest Payment = Current Balance × Monthly Interest Rate
Principal Payment = Total Payment - Interest Payment
New Balance = Current Balance - Principal Payment
This process repeats for each payment until the loan is paid off.
The total interest paid over the life of the loan is calculated by summing all interest payments from the amortization schedule.
Total Interest = (Monthly Payment × Total Payments) - Principal Amount
Making additional principal payments can significantly reduce your total interest paid and shorten your loan term. Try adjusting the calculator to see how extra payments affect your loan.
Learn how interest rates work, the difference between fixed and variable rates, and how they affect your loan payments.
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Last updated: July 26, 2025
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