RC Circuit Calculator

How to use it

1. Resistance R = 2200 Ω, Capacitance C = 4.7×10⁻⁶ F
2. Time constant: Ï„ = R × C = 2200 × 4.7×10⁻⁶
3. Ï„ = 0.01034 seconds (10.34 ms)
4. Cutoff frequency: f = 1 ÷ (2Ï€ × 0.01034) ≈ 15.39 Hz

Common mistakes

• ⚠️ Confusing RC with RL time constant formula
• ⚠️ Not converting μF to Farads correctly
• ⚠️ Forgetting 2Ï€ in the frequency formula

Worked example

Calculate tau for 10k ohm, 100uF.

The time constant {tau} s and cutoff frequency {freq} Hz characterize the RC filter response.

Input guide