Financial
Amortization Calculator
See how each payment splits between principal and interest.
Inputs
Adjust the assumptions to match your scenario. Results update instantly.
Results
Primary outputs and comparison insights are built from the current inputs.
Monthly payment
$1,199.10
Fixed monthly payment amount.
Total interest
$231,676.38
Total interest over the full loan term.
Total paid
$431,676.38
Sum of all payments made.
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How this calculator works
The Amortization Calculator shows how loan payments are split between principal and interest over time. Enter loan amount, annual rate, and term (years) to estimate monthly payment, total interest, and total paid. The calculator updates instantly and adds a comparison table plus chart so you can test the sensitivity of the result before you use it in a decision.
Quick guide
Jump straight to the section you need, then return to the calculator.
Inputs
- Original loan principal.
- Annual interest rate on the loan.
- Loan repayment period in years.
Outputs
- Fixed monthly payment amount.
- Total interest over the full loan term.
- Sum of all payments made.
Assumptions
- Fixed rate and equal monthly payments.
- No extra payments or refinancing.
Tips
- Even one extra payment per year shortens the loan significantly.
- Compare 15-year vs 30-year terms to see the interest difference.
Formula guide
Use these formulas to audit the output or explain it to someone else.
1 formulas
Usage examples
Review a ready-made scenario, copy it, then tweak inputs to match your case.
Example
Home loan breakdown
Inputs
- Example input Loan amount: $250,000.00
- Example input Annual rate: 6.5%
- Example input Term (years): 30
Outputs
- Example result Monthly payment: $1,580.17
- Example result Total interest: $318,861.22
- Example result Total paid: $568,861.22
In the early years, most of each payment goes to interest rather than principal.
Interest by loan term
| Term (years) | Monthly payment | Total interest |
|---|---|---|
| 20 | $1,432.86 | $143,886.91 |
| 25 | $1,288.60 | $186,580.84 |
| 30 | $1,199.10 | $231,676.38 |
| 35 | $1,140.38 | $278,959.35 |
Shorter terms raise monthly payments but dramatically cut total interest.
Total interest vs term length
Focus point
20
$143,886.91
Position
#1 of 4
Original order
Share of total
17.11%
Total: $841,103.48
Shorter terms raise monthly payments but dramatically cut total interest.
References
- Amortization schedule calculation
- Loan repayment analysis
FAQ
Common questions
What does the Amortization Calculator do?
The Amortization Calculator shows how loan payments are split between principal and interest over time. Enter loan amount, annual rate, and term (years) to estimate monthly payment, total interest, and total paid. The calculator updates instantly and adds a comparison table plus chart so you can test the sensitivity of the result before you use it in a decision. It is part of our financial toolkit.
What inputs do I need?
Typical inputs include Original loan principal., Annual interest rate on the loan., Loan repayment period in years..
How are the results calculated?
We follow the formulas and assumptions outlined in the "How this calculator works" section. You will see outputs like Fixed monthly payment amount., Total interest over the full loan term., Sum of all payments made..
Can I share or download the results?
Use the Copy link or Print buttons to share your results. If a table or chart appears, you can download the data as CSV.
Is my data stored?
No. Calculations run in your browser and we do not store your inputs.
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