Electrical Conversion and Formula Tools
Fast single-task tools for common U.S. electrical work, including unit conversions, power formulas, conductor references, conduit layout, and field documentation checks.
Shunt Resistor
Size a DC current shunt from full-scale current and rated millivolt drop.
Insulation Resistance Correction
Correct megger readings to a reference temperature for maintenance records and trend review.
4 Point Saddle Bend
Lay out four marks, bend spacing, flat section width, and shrinkage for a conduit saddle.
3 Point Saddle Bend
Calculate center and outer bend marks for a peaked conduit saddle over a narrow obstacle.
Offset Bend Multiplier
Find the bend multiplier and mark spacing for a simple conduit offset.
Offset Bend Shrink
Estimate shrink allowance for a simple conduit offset.
Offset Bend Spacing
Calculate spacing between conduit offset bend marks.
Kick Bend Multiplier
Calculate field multiplier spacing for a conduit kick bend.
Kick Bend Shrink
Estimate shrink adjustment for a conduit kick bend.
Rolling Offset Travel
Calculate true diagonal travel and roll angle for a conduit rolling offset.
Parallel Offset Spacing
Calculate mark spacing and second mark from true offset and bend angle.
Watts and Amps
Convert watts and amps from voltage, phase, and power factor.
kW and amps
Convert kW and amps for single-phase and three-phase AC loads.
Voltage, Current, and Resistance
Solve one Ohm law variable from the other two.
kVA and Amps
Convert apparent power and current for single-phase and three-phase systems.
Power Factor, kW, and kVA
Solve one value from the kW, kVA, and power factor relationship.
AWG and mm2
Convert AWG and approximate square millimeter conductor area.
kcmil and mm2
Convert large-conductor area between kcmil and square millimeters.
Voltage drop percent
Convert dropped volts and percent voltage drop.
AWG Diameter
Convert AWG gauge to bare conductor diameter.
Wire Resistance
Estimate copper or aluminum conductor resistance.
Temperature Resistance
Correct conductor resistance for temperature.
Voltage Drop Volts
Estimate dropped volts from current, length, and resistance.
Max Wire Run
Estimate maximum run length for a voltage-drop target.
Horsepower and amps
Estimate motor current from horsepower and operating assumptions.
Horsepower and kW
Convert motor horsepower and kilowatts.
Electricity cost
Multiply kWh by an electricity rate.
Watts and kWh
Convert power, runtime, and energy usage.
Battery Ah and Wh
Convert battery amp-hours and watt-hours.
EV amps and kW
Convert EV charging current and power.
Impedance and Current
Calculate current or voltage from impedance magnitude.
RC Time Constant
Calculate tau for resistor-capacitor circuits.
Voltage Divider Output
Calculate Vout from Vin, R1, and R2.
Current Divider Ratio
Calculate current split in two parallel branches.
Series and Parallel Resistance
Calculate total resistance for two-resistor networks.
Capacitive Reactance
Calculate Xc from capacitance and frequency.
Inductive Reactance
Calculate XL from frequency and inductance.
RL Time Constant
Calculate tau for inductor-resistor circuits.