Joule to Volt Converter
Convert between Joules, Volts, and Coulombs using the fundamental electrical energy equation E = Q × V.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
Voltage (V)
10.0000 V
V = 100 J ÷ 10 C
This tool provides general unit conversions for everyday and educational use. For regulated, legal, or scientific applications, verify conversion factors against the applicable official standard.
About the Joule to Volt Converter
The joule to volt converter uses the relationship E = Q × V: energy in joules equals charge in coulombs multiplied by potential difference in volts. It finds the voltage from energy and charge, or the energy from charge and voltage. Joules and volts are different quantities, so a conversion is only possible when the charge is known.
How to use it
- 1Choose to find voltage or energy.
- 2Enter the energy (or voltage) and the charge in coulombs.
- 3Read the result.
- 4Copy, share or print the result with the buttons below it.
Worked example
100 J delivered by a charge of 10 C means a potential difference of 100 ÷ 10 = 10 V.
How it works
Formula
E (J) = Q (C) × V (V)
V = E ÷ Q · Q = E ÷ V
Units
1 Joule = 1 Coulomb × 1 Volt · 1 eV = 1.602 × 10⁻¹⁹ J (electron-volt).
Common use cases
- Physics and electronics homework
- Understanding capacitor and battery energy
- Electrical calculations
Frequently asked questions
A:1 J = 1 V when charge Q = 1 Coulomb. Voltage depends on both energy AND charge.
A:1 kWh = 3,600,000 J = 3.6 MJ.
Reviewed for accuracy · Last updated October 7, 2026
Conversion factors are based on internationally defined SI units and standard metric/imperial equivalence tables.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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