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How to calculate a car loan payment step by step

Published on June 15, 2026

A car loan is one of the biggest financial decisions an adult makes. Before signing, understand exactly what you''ll pay — and why.

1. Start with the down payment

A larger down payment means less financed and less total interest. Aim for at least 20% of the car''s value.

2. Choose the term carefully

Long terms (60 or 72 months) reduce the monthly payment but multiply interest. A $25,000 car at 7% APR over 60 months costs about $29,700 in total.

3. Compare APR across lenders

Use APR, not the headline rate. APR includes fees and insurance — usually 1–3 percentage points higher than advertised.

4. Simulate scenarios

Use the financing calculator to compare: 20% vs 40% down, 36 vs 48 month terms. Small differences save thousands.

Try the related calculator

Financing Calculator