Monthly Car Payment Calculator
Calculate your monthly car loan payment from loan amount, APR, and term in months.
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What this tool does
This calculator computes monthly car loan payments using the standard amortisation formula for fixed-rate instalment loans. It accepts three inputs—loan principal (100–500,000 in your currency), annual percentage rate (0–50%), and term (6–120 months)—and returns the fixed monthly payment amount. The tool also displays total amount paid over the loan term and total interest cost.
How Monthly Car Payment Calculator works
The calculator determines the fixed monthly payment required to fully repay a car loan by a specified maturity date. It accepts the amount borrowed (principal), the annual percentage rate charged by the lender, and the loan term in months. The output is a single monthly payment figure that, when paid every month for the full term, retires both principal and interest. Secondary results include total amount paid and total interest cost.
The formula
The tool applies the standard fixed-rate amortisation equation: M = P × [r(1 + r)^n] / [(1 + r)^n − 1], where M is the monthly payment, P is the principal loan amount, r is the monthly interest rate (annual APR divided by 12 and expressed as a decimal), and n is the number of monthly payments. When APR is zero, the payment simplifies to principal divided by term. Total interest paid equals (M × n) − P.
Where this method is most accurate
This formula models loans with a fixed interest rate, equal monthly payments, and a constant compounding period (monthly). It assumes payments are made on schedule and that no fees, early-repayment penalties, payment holidays, or balloon payments apply. The calculation does not account for variations in month length or the timing of the first payment relative to loan origination. Results match standard amortisation tables published by lenders for simple fixed-rate car finance agreements in most markets.
What this tool does not do
The calculator does not incorporate dealer fees, registration costs, documentation charges, extended warranties, gap insurance, or payment-protection insurance. It does not model variable-rate loans, instalment agreements with irregular payment schedules, or lease-purchase agreements that include a final balloon payment. Tax treatment, early-settlement rebates, and jurisdiction-specific regulatory fees are outside the scope of the calculation. The tool does not verify affordability, creditworthiness, or eligibility for any specific loan product.
Disclaimer
This calculator is an educational tool that performs mathematical computations based solely on user-supplied inputs. It does not constitute financial advice, a loan offer, or a recommendation to enter into any financing arrangement. Actual loan terms, monthly payments, and total costs vary by lender, credit profile, and local regulations. Users should obtain quotes from multiple lenders and review all contract terms before committing to car finance.
Questions
- What is included in the monthly payment figure?
- The monthly payment covers principal repayment and interest charges only. It does not include optional add-ons such as payment-protection insurance, gap insurance, extended warranties, or fees for documentation, registration, or early settlement.
- Why does a longer loan term reduce the monthly payment but increase total interest?
- Spreading the same principal over more months lowers each individual payment. However, because interest accrues on the outstanding balance each month, a longer term means the borrower pays interest for a greater number of periods, raising the cumulative interest cost.
- Can I use this calculator for instalment purchase or balloon-payment agreements?
- The tool models simple fixed-rate amortising loans with equal monthly payments. Instalment purchase agreements that follow this structure will produce accurate results, but lease-purchase plans with a final balloon payment or optional purchase fee require a different calculation.
- What happens if I enter an APR of zero?
- When APR is set to zero, the formula simplifies to principal divided by the number of months. The result is an interest-free repayment schedule sometimes offered as a promotional finance option by dealers or manufacturers.
- How accurate is this calculator compared to a lender's quote?
- The formula matches the standard amortisation tables used by most lenders for fixed-rate car loans. Discrepancies may arise if a lender applies fees, adjusts for payment timing, compounds interest daily rather than monthly, or includes regulatory charges that vary by jurisdiction.
Sources & Methodology
The calculator implements the standard fixed-rate amortisation formula M = P × [r(1 + r)^n] / [(1 + r)^n − 1], where M is monthly payment, P is principal, r is monthly interest rate (APR/12 as decimal), and n is term in months. This equation is derived from the present-value-of-annuity identity and is documented in financial-mathematics textbooks and consumer-finance references.