Free public resources
Automotive calculators
Practical workshop calculations and code conversions available without registration.
Fuse voltage-drop calculator
Estimate parasitic current from a voltage drop measured across a vehicle fuse.
Horsepower calculator
Estimate theoretical crank or wheel horsepower from an actual MAF reading.
MAF calculator
Calculate expected airflow using engine capacity, RPM, MAP and intake temperature.
PSA build code calculator
Convert between PSA ORGA/RPO build codes and vehicle build dates.
Renault radio code calculator
Calculate a four-digit radio code from a supported Renault pre-code.