Spark Plug Ref
About Spark Plug
What this tool does
Automotive tools calculate car loan payments, fuel costs for a trip, tire-size equivalences, 0-60 times, depreciation curves, insurance estimates, and VIN decoding. Inputs are customizable for different currencies and unit systems.
Why use this tool
Car ownership involves complex financial decisions. Comparing loan terms, estimating fuel budgets, or checking whether a tire swap affects your speedometer reading are questions that deserve precise answers, not rough guesses.
How it works
Financial tools apply standard amortization formulas. Tire-size tools compute rolling circumference from width, aspect ratio, and rim diameter. Fuel calculators use distance, consumption rate, and fuel price to estimate costs.
Pro tip
When comparing car loans, look at the total interest paid, not just the monthly payment. A longer term lowers the monthly amount but can double the total interest cost.
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