Convert voltage (V) and charge (C) to energy in joules (J) instantly using J = V × C
Converting voltage (V) and electric charge (C) to energy in joules (J) is a fundamental calculation in physics and electrical engineering. The relationship is given by J = V × C, where J is energy in joules, V is voltage in volts, and C is charge in coulombs. One volt is one joule per coulomb (1 V = 1 J/C), so energy equals voltage times charge. Our free Volts to Joules calculator makes this conversion quick and easy, providing instant and accurate results.
The formula J = V × C expresses the energy stored when charge Q is moved through a potential difference V. It applies to capacitors (E = ½CV² uses a related form), batteries, and any system where electrical potential energy is stored or released. A 12 V battery supplying 10 C of charge delivers 12 × 10 = 120 J of energy. Charge in coulombs is current × time (C = I × t), so you can also think of J = V × I × t (energy = power × time).
This conversion is used for: calculating energy stored in capacitors and batteries, understanding electrochemical cell capacity, designing energy storage systems, physics problems involving potential energy, and electrical engineering calculations. Whether you work with electronics, electrochemistry, or general physics, converting volts and coulombs to joules is essential for energy analysis.
Our calculator takes voltage and charge (coulombs) as inputs, applies J = V × C, and displays the result in joules. No registration required. Whether you're a student, engineer, or researcher, the Volts to Joules calculator delivers accurate results for your energy calculations.
12 V and 5 C gives J = 12 × 5 = 60 J. 230 V and 0.1 C gives J = 23 J. 1.5 V and 2 C (e.g. a small battery) gives J = 3 J. A capacitor charged to 400 V with 0.01 C stores 400 × 0.01 = 4 J.