When to use this calculator
Estimate ideal capacitance from plate geometry and dielectric permittivity. Ideal large parallel plates with uniform dielectric and negligible fringing. Uses a rounded CODATA permittivity.
Explore the dc circuits & components calculators for other questions in this topic. For a related calculation, use the Parallel Resistance Calculator: Find equivalent resistance for two positive resistors in parallel.
PUTTING IT INTO PRACTICE
Parallel Plate Capacitance: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Relative permittivity | 1 |
| Plate overlap area (m²) | 1 |
| Plate separation (mm) | 1 |
| Result | 8.854188 nF |
- Check the input labels and enter the example values above.
- Apply the relationship: Capacitance = ε₀ × relative permittivity × area/separation.
- The result is 8.854188 nF, rounded for display.
How to interpret your result
Ideal large parallel plates with uniform dielectric and negligible fringing. Uses a rounded CODATA permittivity.
Ideal component models omit tolerances, heat and parasitic effects. Distinguish nominal energy from usable energy for batteries. Component ratings and installation requirements need separate manufacturer and design checks.
Frequently asked questions
Can these calculations select a safe installation rating?
No. They explain ideal relationships and do not include every thermal, protective or regulatory requirement.
When is the parallel plate capacitance calculator useful?
Estimate ideal capacitance from plate geometry and dielectric permittivity. Ideal large parallel plates with uniform dielectric and negligible fringing. Uses a rounded CODATA permittivity.
How do I use the parallel plate capacitance calculator?
Enter relative permittivity, plate overlap area (m²), plate separation (mm). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Capacitance = ε₀ × relative permittivity × area/separation.
What should I check before using the result?
Ideal large parallel plates with uniform dielectric and negligible fringing. Uses a rounded CODATA permittivity.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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