Coil Capacitance Calculator
Use the Coil Capacitance Calculator to calculate the self-capacitance of air-cored single-layer solenoid coils. With automated referencing and data interpolation for higher accuracy results
The formula for calculating the capacitance of an air-core single-layer solenoid is:
$latex C= HD\; pF&s=3$
D = Coil diameter in centimetres
H = Factor corresponding to coil length/diameter ratio in Table 1
C = Capacitance in picofarads
Example: Calculate the self-capacitance of a coil that has a length of 15cm and diameter of 5cm
Look up the number corresponding to a length to diameter ratio of 3 in Table 1:
Substituting it into the equation:
$latex C= 0.61*5=3.05\; pF&s=3$
Using the Coil Capacitance Calculator
The Coil Capacitance Calculator automates the whole process and uses data interpolation to give you more accurate results.
Diameter: Enter the coil diameter, measured as depicted in the diagram above.
Length: Enter the coil length, measured as depicted in the diagram above.
Select Units: Select the units that you used for your coil dimensions from the list, and select your preferred output capacitance units.
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Reference: Radiotron Designer’s Handbook