Electric Potential Calculator for V, Q and Distance

Electric potential is one of the most useful quantities in electrostatics because it converts a force-based problem into an energy-per-charge problem. For a point charge, the potential at distance r is V = kQ / r, where k is the Coulomb constant and Q is the source charge in coulombs. This calculator lets you solve that equation in all three directions. You can find the potential created by a charge, determine what charge would be needed to create a target potential, or solve for the distance associated with a known potential and charge. Potential is measured in volts, which are joules per coulomb. That makes it closely connected to energy, work, and voltage difference. In practice, a positive charge produces positive potential and a negative charge produces negative potential. Because the formula depends on 1/r, potential falls off linearly with inverse distance rather than inverse square. This is why potential often stays convenient for comparing different points in space even when the electric field changes rapidly. Rearranging the formula is common in physics classes and engineering estimates. If you know the potential and distance, you can solve for Q = Vr / k to infer the source charge. If you know the potential and the source charge, you can solve for r = kQ / V to find where that potential occurs relative to the point charge. The calculator handles those rearrangements directly so you do not have to worry about algebra errors or scientific notation slips. This point-charge formula is ideal for introductory problems, laboratory approximations, and quick validation checks. It works best in vacuum or air, where the standard Coulomb constant is a reasonable approximation. Once you move into dielectric materials, nonuniform fields, or extended charge distributions, the effective permittivity or geometry changes the relationship. In those cases, the point-charge model still provides intuition, but a more detailed field solution may be required. Even with those limitations, electric potential remains a central concept across electrostatics, capacitor analysis, particle motion, and field visualization. A fast calculator is helpful when you need to compare scenarios, interpret signs, or verify hand calculations before moving on to a more complete design or derivation.