Ampere Calculator
Calculate electrical current in amps from voltage and resistance, watts and volts, or watts and ohms.
Hit Calculate to see current range
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Compare current against wire, trace, fuse, connector, switch and power supply ratings before using it in a real circuit.
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Test how voltage or resistance changes the current without overwriting your main result.
Calculate your baseline first
Use I = V ÷ R. Current in amps equals voltage in volts divided by resistance in ohms.
Use I = P ÷ V. Current in amps equals power in watts divided by voltage in volts. This is for DC or simple resistive AC loads.
No. It calculates electrical current only. Wire, fuse and breaker sizing also depends on voltage, insulation, temperature, run length, duty cycle, installation method and local electrical code.
Results are generated locally in your browser from standard ampere formulas. They are for informational and educational purposes only, not electrical engineering approval, wiring advice or code compliance. Always verify conductor ratings, fuse protection, supply limits, heat dissipation and local electrical regulations before using calculated current in a live circuit. VisionVix accepts no liability for decisions based on this output.