I = P / VNo power factor needed for DC circuits.
Calculate amps from watts at 240V. 240V AC — US high-voltage circuits (dryers, ranges, EV chargers) and Australian standard. Enter your watts below and choose DC, single-phase AC, or three-phase AC.
Power factor varies by load. Use the equipment value when available.
I = P / VCustom voltage is always supported.
I = P / VNo power factor needed for DC circuits.
I = P / (V × PF)Single-phase AC — multiply voltage by power factor.
I = P / (√3 × V × PF)Three-phase AC — divide by √3 ≈ 1.732.
DC formula: Amps = Watts / 240. For AC, divide by (240 × Power Factor). Example: 1000W / 240V = 4.1667 A DC.
4.1667 A for DC. For single-phase AC at PF 0.9: 4.6296 A.
8.3333 A DC. Single-phase AC (PF 0.9): 9.2593 A.