Electrical calculators: choose the right tool
Calculate current, convert motor power and compare wire sizes. Start with the quantity you already know, then select the circuit type and voltage in the calculator.
Power and current
kW to amps — Convert real power to current for DC, single-phase or three-phase circuits.
kVA to amps — Use apparent power and voltage to calculate current.
VA to amps — Find current on the selected transformer winding.
Three-phase current — Calculate balanced three-phase current with power factor and, where needed, efficiency.
Wire sizes, voltage and motors
mm² to AWG — Compare wire cross-sectional area and American Wire Gauge sizes.
Line-to-line and line-to-neutral voltage — Convert voltages in a balanced wye system.
kW to horsepower — Convert motor power units and compare common ratings.
CV to HP — Convert metric horsepower to mechanical horsepower.
Before calculating
kW or kVA? kW measures real power; kVA measures apparent power. Their relationship depends on power factor.
Which voltage? For a balanced three-phase current calculation, use line-to-line voltage. For a transformer, match the voltage to the winding whose current you want.
Motor power? Distinguish electrical input from mechanical output. Efficiency is needed when converting shaft output to electrical input.
Wire conversion? An AWG/mm² comparison gives area, not a cable’s permitted current. Cable selection also depends on installation conditions and applicable rules.
Continue by electrical task
Open a focused directory to choose the next calculation.
Current calculations — Start from kW, kVA, VA or horsepower.
Power and energy — Distinguish kW, kVA, kWh and simultaneous loads.
Wire size and conductor conversions — Compare area, ampacity and cable properties.
Voltage drop — Choose a method for AWG/kcmil, mm² or cable impedance.
Transformer calculations — Match current and voltage to each winding.
UPS and battery calculations — Separate capacity, input current and runtime.
Browse all electrical calculators
Understanding the relationship between energy and power is essential in scientific, engineering, and practical contexts. This guide explores converting joules (J) to kilowatts (kW), including formulas, examples, and applications. Joules ↔ Kilowatts Calculator Convert energy (Joules) to power (kW) using a time interval — or convert kW back to Joules. Clear formulas, instant results, SEO-ready … Read more
Formula: W = J ÷ s (watts = joules ÷ seconds) · 1 W = 1 J/s ⚡ Joule to Watts Calculator Energy in joules (J) Time (seconds) 1 second5 seconds10 seconds30 seconds60 seconds (1 min)3600 seconds (1 hr)Custom… Direction J → WW → J Enter custom time (seconds) Convert Result 📋 Copy 🔄 Reset … Read more
Electrical engineering and electronics depend on accurate conversion between volts and amperes to ensure system safety. A volts-to-amperes calculator provides quick current determination, guiding engineers, technicians, electricians, and everyday equipment users. Watts ↔ Amperes Calculator Conversion Mode: Watts → AmpsAmps → Watts Power (W): System: Single Phase AC (L–N)Two Phase AC (L–L)Three Phase AC (L–L)Direct … Read more
Quick formulas: DC: kW = V × I ÷ 1,000 | 1φ AC: kW = V × I × PF ÷ 1,000 | 3φ AC: kW = V × I × PF × √3 ÷ 1,000 Volts to kW Calculator Voltage (V) Current (A) Phase type Single-phase ACThree-phase ACDC Power factor Convert kW 📋 Copy … Read more
Use our VA to Volts Calculator to accurately convert apparent power into voltage for electrical systems. This tool simplifies complex conversions, essential for engineers working with single or three-phase power configurations. VA to Volts Calculator Power (VA): Current (A): System Type: Single-phase ACThree-phase ACDirect Current (DC) Power Factor: Calculate Reset Formulas used: Single-phase: V = … Read more