Capacitor Time Constant Calculator
The RC time constant characterizes how fast a circuit's transient response changes. It has the dimension of time. A smaller time constant means a faster response, and vice versa.
The time constant is the product of resistance and capacitance (CR). If C is in μF and R is in Ω, then T is in seconds.
V
μF
Ω
Result:
=
s
=
Joules (J)
=
BTU
About the formula
Time constant:
T = R × C
Capacitor stored energy:
E = 0.5 × V² × C
British thermal unit conversion:
1 joule = 0.00094781712 BTU