What formula is used?
Volts equal joules divided by coulombs.
Energy per charge
Joules to Volts Calculator
Calculate electrical potential in volts from energy in joules and electric charge in coulombs.
Interactive calculator
Joules to Volts Calculator
Result
12.000 V
V = J ÷ C
Live circuit diagram
Joules to Volts Calculator visualized in real time
Values update as you use the calculator.
Input
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Circuit setting
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Calculated output
Enter values to see the live result
Quick answers
Joules to Volts Calculator: quick answers
Get concise answers to the most common joules to volts calculator questions before reviewing the formulas, examples, and detailed guidance below.
Why is the second input needed?
Charge is required because voltage measures energy per unit charge.
Can I use decimal values?
Yes, enter positive decimal values in the displayed units.
Formula
Joules to volts formulas
Choose the formula that matches the electrical system and known values.
Voltage
V = J ÷ C
One volt equals one joule per coulomb.
Energy
J = V × C
Find energy from voltage and charge.
Charge
C = J ÷ V
Find charge when energy and voltage are known.
How to use
Calculate in five clear steps
Check every unit and use measured or nameplate values where possible.
- 1. Enter energy in joules.
- 2. Enter charge in coulombs.
- 3. Divide energy by charge.
- 4. Review voltage.
- 5. Confirm both values describe the same transfer.
Worked examples
Practical calculation examples
Examples make the formula and its assumptions easier to verify.
12 J and 1 C
12 V
10 J and 2 C
5 V
240 J and 10 C
24 V
60 J and 0.5 C
120 V
460 J and 2 C
230 V
1,000 J and 4 C
250 V
Accuracy
Common mistakes and limitations
The result is only as reliable as the selected formula and input data.
Conversion library
Explore all 44 electrical calculators
Continue from the Joules to Volts Calculator to a dedicated conversion tool for watts, amps, volts, kW, kVA, energy, batteries, or circuit calculations. Each linked page includes its own formula, examples, and guidance.
FAQ
Joules to volts questions
Direct answers to common calculation questions.
What formula is used?
Volts equal joules divided by coulombs.
Why is the second input needed?
Charge is required because voltage measures energy per unit charge.
Can I use decimal values?
Yes, enter positive decimal values in the displayed units.
Why do units matter?
Incorrect prefixes or charge units can change a result by factors of 1000 or more.
Is this an exact conversion?
The arithmetic is exact for the stated ideal relationship and input assumptions.
Does battery efficiency matter?
Yes for real battery systems; nominal energy conversion does not include losses.
Can voltage change in a battery?
Yes. Battery voltage varies with chemistry, state of charge, load, and temperature.
Can this replace manufacturer data?
No. Use cell and pack specifications for final design.
Is electron-volt an SI unit?
It is a widely used non-SI energy unit accepted for atomic and particle physics.
Can I copy the result?
Yes, use the copy button.
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