🚗 Automotive Tools

Eight tools for car owners — depreciation, tires, fuel cost, maintenance tracking and VIN validation. Every one runs entirely in your browser.

🚗 Car Depreciation Calculator

Estimate your car's current value from purchase price and age.

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🛞 Tire Size Calculator

Diameter, sidewall height and speedometer error from a tire code.

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⛽ Fuel Cost Comparison Calculator

Compare annual fuel cost between two vehicles.

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🛢️ Oil Change Interval Tracker

Find your next oil change due date and mileage.

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🅿️ Parking Cost Calculator

Compare hourly parking cost against a monthly pass.

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🔢 VIN Checksum Validator

Verify a VIN's check digit using the ISO 3779 algorithm.

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🔄 Tire Rotation Schedule Calculator

Find your next tire rotation due date and mileage.

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🚛 Towing Capacity Margin Calculator

Check your safety margin against your vehicle's towing capacity.

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