Calculate electrical power, current, voltage, and resistance for AC and DC circuits.
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Enter any 2 values: Voltage + Current, Current + Resistance, or Voltage + Resistance
Direct current power is straightforward: P = V × I. Used in batteries, electronics, and DC motors.
Alternating current involves power factor. Real power = V × I × cos(φ). Used in household and industrial applications.
Choose between DC circuits or AC circuits (single-phase or three-phase) based on your application.
Select what you want to calculate: power, voltage, current, or resistance.
Input the electrical parameters you know (voltage, current, resistance, power factor for AC).
Get comprehensive results including real power, apparent power, reactive power, and energy costs.
Review power consumption, efficiency, and estimated operating costs for your electrical system.
The actual power consumed by the load and converted to useful work or heat. This is what you pay for on your electric bill.
The total power supplied to the circuit, including both real and reactive components. Important for sizing transformers and generators.
Power that oscillates between source and load without doing useful work. High reactive power indicates poor power factor.
Ratio of real power to apparent power. Values below 0.85 may result in utility penalties and indicate inefficient power usage.
Analyze DC, single‑phase AC, and three‑phase systems. Compute P, V, I, R, power factor, kW/kVA/kVAR, energy, cost, and optional PF correction.
Professional electrical power calculator covering DC, single‑phase AC, and balanced three‑phase systems. Compute real power (kW), apparent power (kVA), reactive power (kVAR), power factor, current, voltage, resistance, efficiency, energy (kWh), operating cost, and power‑factor correction. Formulas follow standard power systems texts and IEEE conventions for reliability.
Handles direct current, single‑phase AC, and balanced three‑phase systems using √3 multipliers for line values.
Real power P = V I cosφ; apparent S = V I; reactive Q = V I sinφ. For three‑phase: multiply by √3 for line quantities.
Energy E = (kW) × hours; Operating cost = E × tariff. Supports daily, monthly, and yearly estimates.
Required kVAR: Qc = P (tanφ₁ − tanφ₂) to improve from existing PF to target PF.
Electrical power calculator, three‑phase power, single‑phase AC power, DC power, kW to kVA, kVAR calculator, apparent power, reactive power, power factor calculator, energy cost calculator, power factor correction capacitor sizing, efficiency calculator, motor current, three‑phase current, line‑to‑line voltage, balanced three‑phase formulas.
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Important: This electrical power calculator is designed for educational, learning, and preliminary analysis purposes using fundamental electrical engineering principles and standard power calculation formulas. While calculations are mathematically accurate for basic electrical relationships, real-world electrical systems involve complex factors including power factor corrections, harmonic distortions, temperature effects, and safety considerations that require professional engineering analysis. For electrical system design, installation, safety assessments, code compliance, or any electrical work involving safety risks, always follow applicable electrical codes (NEC, IEC, local regulations) and consult qualified licensed electricians or electrical engineers who can ensure proper design, installation, and safety compliance for your specific electrical applications.