Amps Calculator

Amps Calculator is a fast, accurate electrical calculator for electricians, electrical engineers, technicians, students and DIY users. Calculate current in amperes, or convert amps to kW, watts, kVA, volts, horsepower, VA and MVA for DC, single-phase AC and three-phase AC circuits. Every result shows the formula used, your values substituted in, and step-by-step working, so you can check the math and learn how it works. ⚡ 8 ELECTRICAL CALCULATORS IN ONE APP • Amps Calculator: find current (I) from power and voltage, or from voltage and resistance with Ohm's law (I = V / R). Enter power in W, kW, VA or kVA. • Amps to kW Calculator: convert amperes to kilowatts (real power), with results in W and MW too. • Amps to Watts Calculator: convert amps to watts for DC, single-phase and three-phase loads. • Amps to kVA Calculator: convert amps to kilovolt-amperes (apparent power) for transformer, generator and UPS sizing. • Amps to Volts Calculator: find voltage from current and power, or from current and resistance (V = I × R). • Amps to HP Calculator: convert amps to motor horsepower using power factor and motor efficiency. • Amps to VA Calculator: convert amps to volt-amperes. • Amps to MVA Calculator: convert amps to megavolt-amperes for large industrial and utility systems. 🔌 DC, SINGLE-PHASE AND THREE-PHASE • DC: P = I × V • AC single-phase: P = PF × I × V • AC three-phase, line-to-line voltage: P = √3 × PF × I × V • AC three-phase, line-to-neutral voltage: P = 3 × PF × I × V • Apparent power: S = I × V, √3 × I × V or 3 × I × V • Horsepower: HP = (P × efficiency) / 745.7 W 📐 BUILT FOR REAL-WORLD WORK • Power factor slider (0.01 to 1.00) with quick presets for motors, PF-corrected and resistive loads • Motor efficiency input for accurate shaft horsepower • Choose mechanical (745.7 W), electrical (746 W) or metric (735.5 W) horsepower • Unit selectors: A, mA, kA • V, kV, mV • W, kW, VA, kVA • Ω, kΩ, mΩ • Voltage presets: 12, 24, 48, 120, 208, 230, 240, 277, 400, 480 and 600 V • Extra results for each calculation, such as mA and kA, W and MW, VA and kVA, input kW and shaft kW • Adjustable decimal places, with very small values never rounded down to zero 📘 LEARN AS YOU CALCULATE Each calculation shows the formula, the substituted values and step-by-step working. A "How It Works" section explains real power, apparent power, power factor, line-to-line and line-to-neutral voltage, and Ohm's law in plain language. It's useful for exam preparation, homework and on-site checks. 📋 HISTORY, COPY AND SHARE • Calculation history is saved automatically on your device • Copy or share any result together with its formula • Light, dark and system themes, with dynamic colors on Android 12+ 🔒 PRIVATE AND OFFLINE All calculations run on your device. No account and no sign-up are needed. Your history and settings stay on your phone. 👷 WHO IT'S FOR • Electricians sizing circuits, checking motor current and load • Electrical engineers working with kW, kVA and three-phase power • HVAC, solar and generator installers • Electrical and electronics students learning power formulas • DIY users checking appliance watts, amps and volts COMMON USES How many kW is 32 amps at 400 V three-phase? How many watts is 15 amps at 120 V? What kVA does a 100 A three-phase supply give? How much horsepower is a 10 A motor? Amps Calculator answers questions like these in seconds. Note: results are for estimating and learning. Always check your design against local electrical codes (NEC, IEC, BS 7671) and have a qualified electrician review it before installation. Amps Calculator by kwcalc.com. Questions or suggestions: contact@kwcalc.com