53 tools shown.
NodeAndVolt Workbench
Search by intent, get calculator suggestions, and review recent calculations from anywhere on the site.
Calculator Hubs
Use focused hubs when you want a practical path through a topic instead of the full tool directory.
Power Systems and Machines
Single-Phase Power
Calculate kW and kVA.
Power3-Phase Power
Calculate balanced kW and kVA.
Bulk powerBulk Power MVA and Amps
Convert between line MVA and current.
System studiesPer-Unit Base Conversion
Convert impedance between study bases.
Fault analysisShort-Circuit Current
Convert fault MVA to symmetrical current.
Fault analysisFault MVA
Convert symmetrical current to fault level.
Fault analysisTransformer Fault Current
Estimate current from nameplate %Z.
Power flowMW, MVAR, MVA, and PF
Solve the AC power triangle.
ConversionkW to Amps
Convert real power to current.
TransformerTransformer kVA
Calculate apparent power.
TransformerTurns Ratio
Calculate ideal winding values.
Three-phaseLine and Phase Values
Convert wye and delta quantities.
MachinesMotor FLA
Estimate full-load current.
Reactive powerPower Factor Correction
Estimate capacitor kVAR.
GenerationGenerator Sizing
Estimate running capacity.
DistributionVoltage Drop
Estimate conductor voltage loss.
Circuits and Electronics
Ohm's Law
Calculate V, I, R, and P.
ResistorsSeries and Parallel Resistance
Combine resistor values.
ResistorsResistor Divider
Calculate unloaded output.
Component referenceResistor Color Code
Decode 4-band and 5-band values.
LEDLED Resistor
Select resistance and wattage.
TransientRC Time Constant
Calculate charging time.
CapacitorsCapacitor Energy
Calculate stored energy and charge.
AC circuitsPhasor Calculator
Convert and combine complex AC quantities.
Engineering mathVector Calculator
Calculate common 3D vector operations.
Signals and AC Analysis
Capacitive Reactance
Calculate Xc and ideal current.
AC analysisInductive Reactance
Calculate Xl and ideal current.
FrequencyLC Resonant Frequency
Find ideal resonance.
WaveformsRMS, Peak, and Peak-to-Peak
Convert sine-wave values.
PhasePhasor Calculator
Convert and combine magnitude-angle quantities.
Signal mathVector Calculator
Work with component vectors and angles.
RF and Electromagnetics
dBm to Watts
Convert dBm to W, mW, and µW.
RF powerWatts to dBm
Convert linear power to dBm.
Signals and RFDecibel Calculator
Convert power and voltage ratios.
WavesWavelength
Calculate wavelength from frequency.
PropagationFree Space Path Loss
Estimate ideal RF propagation loss.
AntennasQuarter-Wave Antenna
Estimate common antenna lengths.
ConductorsSkin Depth
Estimate RF current penetration.
AntennasAntenna Gain
Estimate gain from directivity or aperture.
RF powerEIRP
Combine transmit power, loss, and gain.
Antenna patternsAntenna Directivity
Estimate directivity from beamwidth.
Antenna arraysLinear Array Factor
Evaluate ideal uniform-array reinforcement.
RF phasePhasor Calculator
Work with complex magnitude and phase.
EM fieldsVector Calculator
Calculate field and direction operations.