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.
Payload & Towing Calculator – Stay Within Limits
Payload & Towing Calculator Check your vehicle’s remaining payload and towing margin — stay safe and legal before loading up or hooking up a trailer.....
Power Converter – HP to kW to PS (Metric Horsepower)
Power Converter Convert engine power between HP, kW, and PS (metric horsepower) instantly — compare specs across US, European, and JDM markets. Power Unit Converter....
Power-to-Weight Ratio Calculator – HP per Ton
Power-to-Weight Ratio Calculator Calculate your car’s power-to-weight ratio in hp/tonne and kW/kg — the single best measure of raw performance. Power-to-Weight Calculator HP or kW....
Pre-Purchase Inspection — 60-Point Used Car Audit
Pre-Purchase Inspection Checklist Pre-purchase inspection checklist — 60+ items to check before buying a used car. Built from ASE-certified mechanic inspection sheets covering exterior, interior,....
Pressure Converter – PSI, Bar, kPa, atm & inHg
Pressure Converter Convert pressure across PSI, Bar, kPa, atm, and inHg — covers tyres, oil, boost, and vacuum readings. Multi-Unit Pressure Converter PSI ⇄ Bar....
Quarter Mile Calculator – ET & Trap Speed by HP
Quarter Mile Calculator Estimate your car’s quarter-mile elapsed time and trap speed from weight and horsepower using proven racing formulas. Quarter Mile ET Calculator Weight....
Real-World EV Range — Cold Weather & Speed Loss
EV Range Realistic Estimator Estimate real-world EV range from battery size, EPA rating, ambient temperature, speed, and HVAC use. Plan trips with confidence — winter....
Real-World MPG Calculator — Honest Fuel Economy
Real-World MPG Estimator Calculate true miles per gallon from your actual fill-ups. Trip computers are often optimistic — calculating MPG from odometer and gallons pumped....
Road Trip Budget Calculator – Fuel, Food & Lodging
Road Trip Budget Calculator Plan a complete road trip budget — fuel, accommodation, food, and extras all totalled into one clear itemized summary. Road Trip....
Road Trip Cost Calculator – Fuel Cost Per Person
Road Trip Cost Calculator Split a road trip’s fuel bill fairly — enter distance, economy, fuel price, and passenger count. Trip Cost Splitter Fuel cost....
