Reactive Power (Q)
Calculate Reactive Power (Q) instantly with the exact formula and a worked example. Free online calculator — no signup.
Reactive Power (Q)
S, kVA
cos φ
Q (quality)
7.2kvar
Q
7,2 kvar
More about: Reactive Power (Q)
What it calculates
The “Reactive Power (Q)” calculator computes Q (quality) in kvar from 2 parameters: s, kva, cos φ.
A standard physics formula used in educational and engineering tasks.
Example calculation
With parameters S, kVA = 12, cos φ = 0.8 the result is 7.2 kvar (Q = S·sin φ).
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.