Automotive electrical tools
Choose a calculator or diagnostic tool.
Electrical Tools
Ohm's Law & Circuit Calculators
Combined Ohm's & Watt's Law
Enter any two values. The app calculates the other two.
Voltage—
Current—
Resistance—
Power—
Fuse Voltage-Drop Current
MEMBEREstimate current without removing the fuse.
Ohm's Law Calculator
Enter any two values and leave the third blank.
Watt's Law Calculator
Enter any two values and leave the third blank.
Series Circuit Solver
Enter the values you know. Leave unknown values blank.
Series loads
Parallel Circuit Solver
Enter the values you know. Leave unknown values blank.
Parallel branches
Series-Parallel Circuit Calculator
Build a circuit as a chain of series sections and parallel groups.
Electrical Unit Converter
Convert common electrical units.