RC Time Constant
Calculate RC Time Constant instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
RC Time Constant
RΩ
CF
τ (time constant)
0.01s
More about: RC Time Constant
What it calculates
The “RC Time Constant” calculator computes τ (time constant) in s from 2 parameters: r (Ω), c (F).
A standard physics formula used in educational and engineering tasks.
Example calculation
With parameters R = 10,000 Ω, C = 0 F the result is 0.01 s.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.