Loan principal
$25,000.00
Financial
Loan Calculator
The loan calculator estimates monthly payment, total interest, and payoff cost for an amortized loan.
loanmonthly paymentinterestamortizationpersonal loanauto loan
Calculator
Calculate instantly
Payment = P x r x (1 + r)^n / ((1 + r)^n - 1)
A fixed-rate amortized loan spreads principal and interest across scheduled payments. Reverse modes rearrange the same relationship or estimate the rate numerically.
- The amortization formula uses the number of monthly payments.
- The interest calculation is based on a monthly periodic rate.
- The calculator applies the payment formula, its reverse relationship, or a bounded rate estimate for the selected question.
Inputs
Loan scenario inputs
Move the sliders to estimate a payment, borrowing amount, term, or interest rate for a fixed-rate amortized loan.
Breakdown
Clear result breakdown
Review the values that explain the primary result.
Payments
60
5.0 years
Affordable amount
$25,004.45
Estimated rate
8.01%
Visual comparison
Loan repayment composition
Principal, total interest, and full repayment update as you change the scenario.
Principal, total interest, and full repayment update as you change the scenario.
Loan principal$25,000.00
Total interest$5,414.59
Total repayment$30,414.59
Practical guidance
Insights for this scenario
Term changes total cost
A longer term can lower the monthly payment, but it usually raises total interest because the balance remains outstanding for longer.
Compare the full repayment
Use total repayment alongside the monthly payment so a lower monthly figure does not hide a more expensive loan.
Model fees separately
Origination charges, insurance, tax, and early-settlement rules differ by lender. Add financed fees to the principal only when they are actually financed.
Amortization snapshot
Year 1
$4,236.00 principal / $1,846.92 interest / $20,764.00 balance
Year 2
$4,587.59 principal / $1,495.33 interest / $16,176.41 balance
Year 3
$4,968.36 principal / $1,114.56 interest / $11,208.05 balance
Year 4
$5,380.73 principal / $702.19 interest / $5,827.33 balance
Year 5
$5,827.33 principal / $255.59 interest / $0.00 balance
Step-by-step solution
Follow the calculation path from known values to final result.
- 1
Convert the loan term
n = years x 12
5 x 12
The amortization formula uses the number of monthly payments.
60 payments
- 2
Convert annual rate to monthly rate
r = annual rate / 12 / 100
8% / 12 / 100
The interest calculation is based on a monthly periodic rate.
0.006667
- 3
Apply the selected loan mode
Payment = P x r x (1 + r)^n / ((1 + r)^n - 1)
The calculator applies the payment formula, its reverse relationship, or a bounded rate estimate for the selected question.
$506.91
Formula explorer
Payment = P x r x (1 + r)^n / ((1 + r)^n - 1)
A fixed-rate amortized loan spreads principal and interest across scheduled payments. Reverse modes rearrange the same relationship or estimate the rate numerically.
- P(USD)
- Principal: The amount borrowed after any financed fees.
- r(% per month)
- Monthly rate: Annual interest rate divided by 12 and then by 100.
- n
- Number of payments: Loan term in months.
Assumptions and references
Assumptions
- Interest rate and scheduled payment stay fixed for the modeled term.
- Payments are monthly and occur on schedule.
- Optional fees, tax, insurance, and penalties are excluded unless included in the amount.
Limitations
- Actual lender APR, underwriting, timing, variable-rate terms, and early repayments can change the result.
Worked examples
EasyEstimate a car or personal loan payment
Known values
- Loan amount: $25,000.00
- Annual interest: 8%
- Term: 5 years
Calculation
- 1. Convert 5 years to 60 monthly payments.
- 2. Convert 8% annual interest to a monthly rate.
- 3. Apply the fixed-rate payment formula.
Result and meaning
The monthly payment is about $507 before lender-specific fees and add-ons.
Real-worldChoose between two loan terms
Known values
- Same borrowing amount and rate
- One shorter term and one longer term
Calculation
- 1. Compare both monthly payments.
- 2. Compare total interest and total repayment.
- 3. Choose a payment you can sustain with an emergency buffer.
Result and meaning
The shorter term normally costs less overall but requires a larger monthly commitment.
Learning guide
Understand the calculation
Concepts
- Amortization means each payment contains both interest and principal.
- Early payments usually contain more interest because the outstanding balance is larger.
- APR and total repayment are both important when comparing offers.
Tips
- Use take-home cash flow, not only lender affordability, when setting a payment target.
- Compare the full term and total interest across offers.
- Check whether fees are paid upfront or financed.
Common mistakes
- Comparing only monthly payments.
- Using a nominal rate when a lender quote uses a different APR method.
- Forgetting insurance, tax, and other ownership costs.
Educational notes
- This calculator provides an estimate, not a credit offer or financial advice.
Trust panel
Calculator quality and review
- Reviewed by
- AZCalculate finance calculator review
- Review date
- 2026-06-25
- References
- 4
- Trust score
- 92/100
- Formula verified
- Yes
- Risk level
- high
- Category
- Financial
- Calculator version
- 2.1
- Formula version
- 2.1
Sign in to save this calculation and access it later.
Trust note
Important estimate
This loan calculation is an estimate for fixed-rate amortized loans. Actual lender terms, fees, APR, insurance, tax, early repayment rules, and eligibility can change the result.
High risk contextDifficulty: intermediateConfidence estimate: 92/100Reviewed 2026-06-25Reviewed by: AZCalculate finance calculator reviewCalculator v2.1 / Formula v2.14 sources listed
References
Sources used for this calculator
Last checked: 2026-06-24
Official
Consumer Financial Protection Bureau amortization schedule guidance
Consumer Financial Protection Bureau
Last checked: 2026-06-24
Last checked: 2026-06-25 | Next review: 2026-12-25
Last checked: 2026-06-25 | Next review: 2026-12-25
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Calculator usage
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FAQ
Loan Calculator FAQs
Can this calculator estimate auto loans?+
Yes. It works for many fixed-rate amortized loans including auto, personal, and installment loans.
Does it include fees?+
No. Add fees to the principal if you want to model them inside the payment.
What does the loan calculator estimate?+
It estimates monthly payment, total repayment, total interest, and reverse-mode values for fixed-rate amortized loans.
Can I calculate a loan amount from a target payment?+
Yes. Choose the loan amount mode and enter the payment, rate, and term you want to test.
Does this include lender fees?+
No. Add financed fees to the loan amount if you want them included in the payment model.
What is amortization?+
Amortization spreads principal and interest across scheduled payments over the loan term.
Why does a longer term cost more?+
A longer term can lower the monthly payment, but interest has more time to accumulate.
Can I use this for auto or personal loans?+
Yes. It works for many fixed-rate installment loans when the payment schedule is monthly.
Is APR the same as interest rate?+
Not always. APR can include certain fees and lender charges, so use the value that matches the comparison you need.
Can early repayment change the result?+
Yes. Extra payments or early payoff can reduce interest, depending on lender rules and fees.
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