Voltage measures the electrical potential difference that drives current through a circuit — and it's calculated by dividing energy by electric charge. Enter your Energy (Joules) and Electric Charge (Coulombs) into the Joules to Volts Calculator to get the resulting Voltage in volts. Also try the Amps to kW Calculator.
Voltage
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To convert joules to volts, divide the energy in joules by the electric charge in coulombs using the formula: V = E/Q. For example, 1000 J divided by 10 C equals 100 V. See also our kW to kWh Calculator.
Energy is the ability to do work. It cannot be created or destroyed, only converted from one form to another according to the law of conservation of energy.
Electric charge is the property of matter that causes it to experience electrical forces. It's measured in coulombs (C) and can be positive or negative.
Voltage is the electric potential difference between two points. It represents the energy per unit charge and is measured in volts (V). You might also find our Amps to kVA Calculator useful.
Yes, voltage can be negative. The sign indicates the direction of the potential difference relative to a reference point.
Using the formula V = E/Q, the voltage would be 1,000 J ÷ 10 C = 100 V.
If the charge is zero, the calculation becomes undefined (division by zero). You need a non-zero charge value to calculate voltage.