# RC Time Constant Calculator

> RC time constant calculator: compute tau plus charge and discharge times from your resistor and capacitor values instantly. Free, editable values, no signup.

- **Canonical URL:** https://boringtoolskit.com/rc-time-constant-calculator/
- **Category:** Energy & Electrical
- **Evidence level:** catalogue
- **Reviewed:** July 26, 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

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