Electricity & Magnetism
Capacitance
Capacitance is charge stored per unit voltage.
Variables
CF
Capacitance
Charge storage ability
In SI units: A²·s⁴/(kg·m²)
Allowed values: greater than 0
QC
Charge
Stored charge
In SI units: A·s
VV
Voltage
Potential difference
In SI units: kg·m²/(A·s³)
Derivation
C = Q/V by definition.
Your notes
0/5000
Check value
Round inputs run through this page's calculator. Use it to test your own working or a rearranged form. It is a test case, not a real-world example.
- Q = 2 C (Charge)
- V = 3 V (Voltage)
Result: C = 0.66666667 F
Other electricity & magnetism formulas with the same quantities
- RC Time Constant (Capacitance) shares Capacitance
- Capacitor with Dielectric (Capacitance) shares Capacitance
- Ohm's Law (Electric Circuits) shares Voltage
- Electric Power (Electric Circuits) shares Voltage
- Capacitive Reactance (AC Circuits) shares Capacitance
- Resonant Frequency (LC) (AC Circuits) shares Capacitance
Where this formula is listed
- Electricity & Magnetism formulas, under Capacitance, alongside Capacitors in Series, Capacitors in Parallel and Energy Density (Electric Field).
- In the electricity & magnetism list it comes after Kirchhoff's Current Law and before Parallel Plate Capacitor.
- Electricity & Magnetism formula sheet, one of 48 formulas printed with symbol keys and SI units.
- The full formula index, grouped by category and topic.
Common questions
What is the Capacitance formula?
Capacitance is written C = Q/V. Capacitance is charge stored per unit voltage. It belongs to Electricity & Magnetism, under Capacitance.
What are the units in C = Q/V?
In SI units, C is capacitance, measured in A²·s⁴/(kg·m²); Q is charge, measured in A·s; V is voltage, measured in kg·m²/(A·s³).
How is the Capacitance formula derived?
C = Q/V by definition. The result is C = Q/V.