Loan Amortization Calculator
Month by month: interest = balance × r, principal = payment − interest — 250,000 at 7%/30y opens 1,458/205.
- See the full payoff schedule.
Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.
How the Loan Amortization Calculator Works
The amortization schedule details each monthly payment, showing how much goes to interest and how much reduces the principal. At the start of the loan, most of the payment goes to interest, then gradually shifts toward principal over time.
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Step 1
Specify loan amount, interest rate, and term
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Step 2
Calculate the fixed monthly payment
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Step 3: For each month
calculate interest on remaining balance
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Step 4
Subtract interest from payment to get principal portion
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Step 5
Subtract principal paid from balance to get new balance
Use Cases
Budget Planning
Understand payment distribution between principal and interest for better financial planning
Evaluating Extra Payments
See the impact of extra payments on reducing loan term and total interest
Comparing Financing Options
Compare amortization schedules of different loans to choose the best one
Tax Planning
Know annual interest amounts to benefit from tax deductions where applicable
Tips
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Review the amortization schedule before signing the loan
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Notice how the interest-to-principal ratio changes over time
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Use the schedule to plan extra payments strategically
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Compare loans with same payment but different terms
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Keep a copy of the amortization schedule to track your loan
Common Mistakes
Expecting Equal Principal Reduction
Ignoring Early Interest Impact
Not Updating the Schedule
Confusing Numbers
FAQs
Why does most of the payment go to interest at the beginning?
How does an extra payment affect the amortization schedule?
What is the difference between fixed and variable amortization?
When is half the loan actually paid off?
Can I get an amortization schedule from the bank?
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