Voltage Drop Calculator
Ohm's Law, voltage drop, resistor, and electrical calculation tools
Electronics Calculators
Professional electrical and electronics calculators for engineers, technicians, and hobbyists. Calculate voltage, current, resistance, power, and component values with precision.
Calculate voltage drop across wire runs for proper circuit design
How to use: Calculate voltage loss over wire runs for proper electrical system design. Enter Current in amps (load draw), Distance in feet (one-way wire length), Wire Gauge AWG (14 AWG = 15A circuits, 12 AWG = 20A circuits, 10 AWG = 30A circuits), and Source Voltage. Results show: Voltage Drop (voltage lost in wire), Voltage at Load (power delivered), Percent Drop (efficiency metric), Power Loss (wasted watts), and Wire Resistance. NEC recommends <3% drop for branch circuits, <5% total. High voltage drop causes dimming lights, motor failure, equipment damage. Use larger wire for long runs or high current. Critical for automotive, solar, and low-voltage systems.
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