Apps
Free online car tools and calculators for DIY mechanics and vehicle owners. Use these apps to estimate fuel costs, compare tire sizes, convert repair units, plan maintenance, check diagnostics, and solve common auto tasks online.
Transmission Fluid Life — ATF Mileage Calculator
Transmission Fluid Life Estimator Estimate when your automatic transmission fluid needs to be changed based on mileage, towing duty, and ambient temperature. ATF degrades faster....
Turbo Boost Calculator – Estimate Power Gain from PSI
Turbo Boost Power Calculator Estimate horsepower gain from boost pressure relative to atmospheric — quick turbo planning and intercooler sizing guide. Boost Power Estimator NA....
Used Car Buying Guide — 20-Step Checklist
Used vs Certified Pre-Owned Comparison Used car buying guide — 20-step checklist from setting budget through closing the deal. Covers history report, mechanical inspection, negotiation....
Vehicle Recall Tracker — Open Safety Recalls
Vehicle Recall Tracker Check for open recalls on your vehicle by VIN, make, or model. NHTSA publishes recall data daily — vehicles with open recalls....
Wheel Bolt Pattern Lookup – PCD & Stud Count Guide
Wheel Bolt Pattern Lookup Select a bolt pattern (PCD) to instantly see the stud count, pitch circle diameter in mm and inches, and common vehicle....
Wheel Offset Calculator – ET, Backspacing & Poke
Wheel Offset Calculator Convert between ET offset, backspacing, and poke — check wheel fitment before buying new rims. Wheel Offset Converter ET ↔ Backspacing ↔....
Winter Setup Score — Snow & Ice Readiness
Winter Setup Score Pick the right windshield wiper size for your car — front and rear blades. Includes the most common 200+ vehicle fitments and....
Wiper Blade Size Guide – Find Your Length
Wiper Blade Size Guide Understand wiper blade sizing and verify your driver and passenger blade lengths are in the correct typical range for your vehicle.....
