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.
RPM Calculator – Engine Speed at Any MPH
RPM Calculator Calculate engine RPM at any road speed from gear ratio, final drive, and tire size — essential for gearing decisions. RPM at Speed....
Safety Rating Lookup — IIHS & NHTSA Stars
Safety Rating Comparator Look up safety ratings — IIHS Top Safety Pick status, NHTSA stars, crash test scores and standard ADAS features (AEB, lane keep,....
Service Cost Estimator — Parts & Labor by Job
Service Cost Estimator Estimate parts and labor cost for the 20 most common car repairs. Compare to your shop’s quote before saying yes, or budget....
Spark Plug Gap Guide – Standard Settings & Adjustment
Spark Plug Gap Guide Look up the correct spark plug gap range for your engine type and convert any gap measurement between inches and millimeters....
Spark Plug Gap Helper — Convert & Match Spec
Spark Plug Gap Helper Convert spark plug gap between inches, millimeters, and thousandths of an inch, and verify it matches your engine’s factory spec. Wrong....
Speed Converter – MPH to KM/H to Knots
Speed Converter Convert vehicle speed between mph, km/h, m/s, and knots in real time — enter any unit and all others update instantly. Speed Converter....
Speedometer Error Calculator – Tire Size Change
Speedometer Error Calculator See exactly how a tire size change affects your indicated vs actual speed — and whether you’re unknowingly speeding. Speedometer Error Calculator....
Test Drive Checklist — 12-Point Scorecard
Test Drive Checklist Choose between sedan, SUV, hatchback, pickup, coupe, wagon, minivan or convertible based on how you actually use a car. Quick 8-question quiz....
Tire Life Calculator – Estimate Remaining Tread Miles
Tire Life Calculator Estimate how many kilometres are left on your tyres from current tread depth — plan your next purchase before the legal limit.....
Tire Pressure Calculator – Adjust for Load & Towing
Tire Pressure Load Adjustment Get a guideline tire pressure adjustment for heavy loads — enter your placard pressure, baseline load, and current load. Tyre Pressure....
