Electrical & Lighting
Convert current to voltage with watts or ohms — power and resistance maths computed in your browser, nothing uploaded.
Amps to volts calculator
Amps to volts with watts (V = P / I) or ohms (V = I × R) — both modes, live error checks, computed in your tab.
Amps to Watts Calculator
Amps to watts for DC, single- or three-phase AC with power factor — Calculate, Swap, Copy and Reset, computed in your tab.
Amps to kVA Calculator
Amps to kilovolt-amps for single- and three-phase loads — apparent power computed live in your tab.
Amps to Kilowatts Calculator
Amps to kilowatts for DC or AC with power factor — real power with Calculate, Swap, Copy and Reset, nothing uploaded.
Joules to volts calculator
Joules to volts from energy and charge (V = E / Q) — enter both values, press Calculate, nothing uploaded.
Joules to watts calculator
Joules to watts from energy and time (P = E / t) — Calculate, Copy and Reset, computed in your tab.
Volts to amps calculator
Volts to amps with watts (I = P / V) or ohms (I = V / R) — both modes, live error checks, computed in your tab.
Volts to joules calculator
Volts to joules from voltage and charge (E = V × Q) — Calculate, Reset and Copy, computed in your tab.
Volts to Watts Calculator
Volts to watts for DC, single- or three-phase AC with power factor (P = V × I) — Calculate, Copy and Reset, computed in your tab.
Watts to Amps Calculator
Watts to amps for DC, single- or three-phase AC with power factor — Calculate, Swap, Copy and Reset, computed in your tab.
Watts to joules calculator
Watts to joules from power and time (E = P × t) — Calculate, Copy and Reset, computed in your tab.
Watts to volts calculator
Watts to volts from power and current (V = P / I) — DC, single- or three-phase AC with power factor, line-to-line and line-to-neutral, computed in your tab.
Amps to VA calculator
Amps to volt-amps for single- and three-phase loads (S = I × V or √3 × I × V) — apparent power computed live in your tab.
Electricity Bill Calculator
Electricity cost per day, month and year from power, hours run and the price of 1 kWh — country currency units and appliance presets, nothing uploaded.
Energy Consumption Calculator
kWh per day, month and year from device power and hours run per day — appliance presets for common devices, computed in your tab.
Energy cost calculator
Energy cost per day, month and year from watts, hours per day and the price per kWh — cents, pence, rupees or pesos, nothing uploaded.
Electron-volts to volts calculator
Electron-volts to volts from energy and charge (V = E / Q) — elementary-charge or coulomb mode, Calculate, Copy and Reset, computed in your tab.
kVA to amps calculator
kVA to amps for single- and three-phase loads (I = S / V or S / (√3 × V)) — apparent power to current, computed live in your tab.
Kilowatts to Amps Calculator
Kilowatts to amps for DC, single- or three-phase AC with power factor — Calculate, Swap, Copy and Reset, computed in your tab.
Kilowatts to kilowatt-hours calculator
Kilowatt-hours from power and time (E = P × t) — Calculate, Copy and Reset, computed in your tab.
Kilowatt-hours to kilowatts calculator
Kilowatts from energy and time (P = E / t) — Calculate and Reset, computed in your tab.
kVA to kW Calculator
Kilowatts from apparent power and power factor (P = S × PF) — Calculate, Copy and Reset, computed in your tab.
kVA to VA calculator
Volt-amps from kilovolt-amps (S = 1000 × kVA) — Calculate, Copy and Reset, computed in your tab.
kVA to watts calculator
Watts from apparent power and power factor (P = 1000 × S × PF) — Calculate and Reset, computed in your tab.
kW to kVA calculator
Kilovolt-amps from real power and power factor (S(kVA) = P(kW) / PF) — Calculate, Copy and Reset, computed in your tab.
kW to VA calculator
Volt-amps from kilowatts and power factor (S(VA) = 1000 × P(kW) / PF) — Calculate and Reset, computed in your tab.
Kilowatts to volts calculator
Volts from kilowatts and current for DC, single- or three-phase AC with power factor — Calculate, Copy and Reset, computed in your tab.
KWh to watts calculator
Watts from energy and time (P(W) = 1000 × E(kWh) / t(h)) — Calculate and Reset, computed in your tab.
mAh to Wh conversion calculator
Milliamp-hours to watt-hours from charge and voltage (E(Wh) = Q(mAh) × V / 1000) — battery energy computed live in your tab.
Ohms Law Calculator
Ohms law with solution steps — any 2 of voltage, current, resistance or power with unit prefixes, plus AC impedance and complex power in magnitude ∠ angle or R + jX / P + jQ form, computed in your tab.
Power Calculator
Electric power — DC from V, I or R (P = V × I = V²/R = I² × R), AC with impedance, phase angle φ and complex power in magnitude ∠ angle or R + jX / P + jQ form, plus energy to average power, computed in your tab.
Power factor calculator
Power factor for single- and three-phase loads from kW, amps, voltage and frequency — PF, kVA, kVAR and the correction capacitor in µF for a target PF, computed in your tab.
VA to amps calculator
Volt-amps to amps for single- or three-phase loads (I = S / V or S / (√3 × V)) — apparent power to current, computed live in your tab.
VA to kVA calculator
Kilovolt-amps from volt-amps (S(kVA) = S(VA) / 1000) — Calculate and Reset, computed in your tab.
VA to kW calculator
Kilowatts from apparent power and power factor (P(kW) = S(VA) × PF / 1000) — Calculate and Reset, computed in your tab.
VA to watts calculator
Watts from volt-amps and power factor (P(W) = S(VA) × PF) — Calculate and Reset, computed in your tab.
Volts to electron-volts calculator
Electron-volts from voltage and charge (E(eV) = V × Q) — elementary-charge or coulomb mode, Calculate, Copy and Reset, computed in your tab.
Volts to kilowatts calculator
Kilowatts from voltage and current for DC, single- or three-phase AC with power factor (P(kW) = V × I / 1000) — Calculate and Reset, computed in your tab.
Voltage Divider Calculator
Voltage divider — enter any 3 of input voltage, R1, R2 and output voltage to get the 4th, with mV/V/kV and Ω/kΩ/MΩ units (Vout = Vin × R2 / (R1 + R2)), computed in your tab.
Watts to kVA calculator
Kilovolt-amps from real power and power factor (S(kVA) = P(W) / (1000 × PF)) — Calculate and Reset, computed in your tab.
Watts to kWh Calculator
Kilowatt-hours from power and time (E(kWh) = P(W) × t(h) / 1000) — Calculate and Reset, computed in your tab.
Watts to VA calculator
Volt-amps from real power and power factor (S(VA) = P(W) / PF) — Calculate and Reset, computed in your tab.
Watts / Volts / Amps / Ohms calculator
DC Ohms law four-way — any two of resistance, current, voltage or power give the other two, with μΩ to MΩ, μA to MA, μV to MV and μW to MW unit prefixes, computed in your tab.
Wh to mAh conversion calculator
Milliamp-hours from energy and voltage (Q(mAh) = 1000 × E(Wh) / V) — battery charge computed live in your tab.
Candela to lumens calculator
Lumens from luminous intensity and beam cone apex angle in degrees (Φv = Iv × 2π(1 − cos(θ/2))) — computed live in your tab.
Candela to lux calculator
Illuminance in lux from candela and distance — Ev = Iv / d² in meters or 10.76391 × Iv / d² in feet, computed live in your tab.
Footcandles to lux conversion calculator
Lux from footcandles (Ev(lx) = Ev(fc) × 10.76391) — enter the illuminance, press Calculate, computed in your tab.
Lumens to candela calculator
Candela from luminous flux and beam cone apex angle in degrees (Iv = Φv / 2π(1 − cos(θ/2))) — computed live in your tab.
Lumens to lux calculator
Illuminance in lux from lumens spread over a surface area or a spherical radius in ft²/m² or ft/m (Ev = Φv / A) — computed live in your tab.
Lumens to millicandela calculator
Millicandela from luminous flux and beam cone apex angle in degrees (Iv = 1000 × Φv / 2π(1 − cos(θ/2))) — computed live in your tab.
Lumens to watts calculator
Watts from lumens and luminous efficacy (P = Φv / η) — tungsten, halogen, fluorescent, LED and other lamp presets or your own lm/W value, computed in your tab.
Lux to candela calculator
Candela from illuminance and distance — Iv = Ev × d² in meters or 0.09290304 × Ev × d² in feet, computed live in your tab.
Lux to footcandles conversion calculator
Footcandles from lux (E(fc) = E(lx) × 0.09290304) — enter the illuminance, press Calculate, computed in your tab.
Lux to lumens calculator
Lumens from illuminance over a surface area or a spherical radius in ft²/m² or ft/m (Φv = Ev × A) — computed live in your tab.
Lux to watts calculator
Watts from illuminance, a light-source efficacy preset or your own lm/W, and area or spherical radius (P = Ev × A / η) — computed in your tab.
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