Home / Calculators / Electrical Tools
ELECTRICAL FIGURES, MADE CLEAR
Electrical Tools for clear calculations.
Calculate AC current or real power and convert between kW and kVA, with the voltage basis stated clearly.
Work through the electrical figures.
Three-phase voltage is line-to-line; current is line current. Unbalanced loads need individual assessment.
Delivered electrical power, not mechanical motor output. One kW equals 1,000 watts.
Use the equipment’s apparent-power load. Real kW equals kVA multiplied by power factor.
Enter RMS current. Three-phase calculations assume equal current and power factor on all phases.
Single-phase: line-to-neutral voltage. Balanced three-phase: line-to-line voltage.
Power factor relates real kW to apparent kVA. Use measured or specified data; it is not efficiency.
Estimates stay in this tab. Contact details are shared only when you request a report.
Your calculation, explained.
The first submission is checked on our server. Further edits update this private on-screen preview instantly.
Live preview updated from your current values. The original enquiry remains saved; these edits stay in this tab unless you email an updated PDF.
Inputs & assumptions
Calculated results
Current at the same kW and power factor
How the numbers are calculated
BEHIND YOUR ESTIMATE
Use the right quantities.
Current, real power and apparent power are related but different. Use RMS voltage/current and the correct phase basis. These AC tools support arithmetic checks, not protection, wiring or equipment approval.
Which tools are included?
Find current from real kW, voltage and power factor; find real power from current, voltage and power factor; or convert kW to kVA and kVA to kW. Voltage and phase also provide a related line-current estimate.
When does the square root of three apply?
For a balanced three-phase system, total power uses the square root of three with line-to-line voltage and line current. Single-phase uses line-to-neutral voltage and a factor of one. Unbalanced systems need individual measurements.
Is power factor the same as efficiency?
No. Power factor is the ratio of real kW to apparent kVA. Efficiency relates useful output to input. If starting with mechanical motor shaft power, account for motor efficiency separately before using electrical input power.
Can this size my cable or breaker?
No. Conductor and protection selection also depends on installation method, temperature, grouping, voltage drop, fault conditions and applicable requirements. Use a qualified engineer for those decisions.
Reference: Schneider Electric — balanced three-phase power calculation. Verify the final design with appropriate site and manufacturer data.