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Payment Calculator

Calculate a fixed-rate loan payment, total interest, total cost, and amortization schedule from the amount, rate, term, and fees.

Payment Calculator Inputs

Amount borrowed before optional fees.

Results computed instantly — your data never leaves your device.

Live Payment Calculator Results

Real-Time

Monthly Payment

$489.15

60 monthly payments

Total Interest

$4,349.22

Total Cost

$29,349.22

Starting Balance

$25,000

Principal 85.2%Interest 14.8%
100% Client-SidePrivate & Secure

Annual Amortization Snapshot

PeriodPaymentPrincipalInterestBalance
1$489.15$353.74$135.42$24,646.26
12$489.15$375.39$113.76$20,626.38
24$489.15$400.53$88.62$15,959.86
36$489.15$427.36$61.79$10,980.81
48$489.15$455.98$33.17$5,668.3
60$489.15$486.52$2.64$0

How to Use the Payment Calculator

  1. 1

    Enter the amount borrowed and any fees that will be added to the balance.

  2. 2

    Enter the annual interest rate and the repayment term in years.

  3. 3

    Review the live monthly payment, total interest, and total cost.

  4. 4

    Use the amortization snapshot to see how payments reduce principal over time.

Formula & Mathematical Basis

P = Principal + Fees | r = APR ÷ 1,200 | n = Years × 12 | M = P × [r(1+r)^n] / [(1+r)^n − 1]

Variable Key

P

Financed amount including the entered fees

r

Monthly interest rate as a decimal

n

Total number of monthly payment periods

M

Fixed monthly payment

📝 The 0% branch uses M = P ÷ n. Inputs are constrained to finite non-negative values in the client-side calculation module.

Step-by-Step Examples

1

Fixed-rate payment estimate

Scenario: $25,000 principal, $0 fees, 6.5% APR, and a 5-year term.

  1. 1.Financed amount P = $25,000.
  2. 2.Monthly rate r = 6.5% ÷ 1,200.
  3. 3.Payment periods n = 5 × 12 = 60.
  4. 4.Apply the fixed-rate payment equation and review the schedule.
✅ The dashboard shows the monthly payment, total interest, total cost, and payment-by-payment balance.
2

Fees included in financing

Scenario: $25,000 principal, $500 fees, 0% APR, and a 2-year term.

  1. 1.Financed amount P = $25,500.
  2. 2.Payment periods n = 24.
  3. 3.At 0% APR, monthly payment = $25,500 ÷ 24.
  4. 4.Total interest remains $0.
✅ $1,062.50 per month before any separate charges not entered in the calculator.

Practical Use Cases

  • ✓ Compare monthly payments for multiple terms.
  • ✓ See the cost impact of adding financed fees.
  • ✓ Estimate total interest before requesting quotes.
  • ✓ Review how principal and interest change across the schedule.
  • ✓ Test a zero-interest promotion without a divide-by-zero error.

Common Pitfalls

  • ⚠ Entering a monthly APR instead of an annual percentage.
  • ⚠ Ignoring fees that are financed by the lender.
  • ⚠ Comparing monthly payments without comparing total cost.
  • ⚠ Using negative amounts to represent credits; enter credits separately in a lender quote.
  • ⚠ Treating an estimate as a binding offer.

Frequently Asked Questions

How is the monthly payment calculated?

The calculator applies the standard fixed-rate amortization formula using the financed amount, monthly interest rate, and number of monthly payments. At 0% interest, it divides the financed amount evenly across the term.

Are fees included in the payment?

Yes. Fees entered in the Fees Added field are added to the principal before the monthly payment is calculated.

Why does a longer term reduce the payment?

A longer term spreads repayment across more monthly periods. It can reduce the monthly amount while increasing the number of periods during which interest accrues.

Does this show a lender quote?

No. It is a planning estimate based only on the values entered. Confirm lender-specific fees, taxes, insurance, and terms with the provider.

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