📊 Business
Loan Amortization Calculator
Our loan amortization calculator computes your monthly payment, total interest paid over the life of the loan, and total cost. Essential for comparing mortgage offers, auto loans, and business financing.
IM MET
How to Use This Tool
- Enter the total loan amount you are borrowing.
- Input the annual interest rate in percent.
- Enter the loan term in years.
- Click Calculate to see your monthly payment and total cost of the loan.
The Formula
Uses the standard amortization formula: M = P x [r(1+r)^n] / [(1+r)^n - 1] where P is the principal, r is the monthly interest rate, and n is the total number of payments.
Why It Matters
You take a $200,000 mortgage at 6.5% for 30 years. Your first payment is mostly interest ($1,083) with only $206 to principal. After 5 years, you paid $58,000 total but only $26,000 toward principal.
Frequently Asked Questions
What is amortization?
Amortization is the process of paying off a loan through regular, scheduled payments that cover both principal and interest. Each payment is split between the interest accrued that period and reducing the outstanding principal balance. In the early years, most of your payment goes toward interest; over time, more goes toward principal. By the end of the loan term, the entire balance is paid off.
Why do early payments go mostly to interest?
Interest is calculated on your outstanding principal balance. At the start of the loan, the balance is at its highest, so the interest portion of your payment is also highest. As you make payments and the principal decreases, the interest portion shrinks and more of your fixed monthly payment applies to reducing the principal. This front-loading of interest is why you build equity slowly in the first few years.
How does making an extra payment help?
Extra payments go directly toward reducing your principal balance, which lowers the interest charged on future payments. Even an extra $100 per month on a $250,000 mortgage at 6.5% can save over $25,000 in interest and shave several years off your loan term. You can choose to keep the same payment and shorten the term, or keep the same term and lower your monthly payment (called recasting).
What is the difference between a 15-year and 30-year loan?
A 15-year loan has higher monthly payments but significantly lower total interest costs and builds equity faster. A 30-year loan offers lower monthly payments, more flexibility, and allows you to invest the difference elsewhere. For a $250,000 loan at 6.5%, the 15-year payment is about $2,181 versus $1,580 for 30 years, but you save roughly $164,000 in total interest with the 15-year. Choose based on your cash flow comfort and investment discipline.
Can I recast my mortgage?
Recasting (or re-amortization) allows you to make a large lump-sum payment toward your principal and have your monthly payment recalculated based on the new, lower balance. Most lenders charge a fee of $250-$750 for this, but it can significantly reduce your monthly payment without the penalty of refinancing. Recasting does not change your interest rate or loan term, so it is ideal when you have a windfall but want to keep your existing favorable rate.
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