CI half-width
Calculate CI half-width instantly with the exact formula and a worked example. Free online calculator — no signup.
CI half-width
p (proportion)
n
z (1.96=95%)
CI half-width
0.098
p
0,5
n
100
Lower
0,402
Upper
0,598
More about: CI half-width
What it calculates
The “CI half-width” calculator computes CI half-width from 3 parameters: p (proportion), n, z (1.96=95%).
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters p (proportion) = 0.5, n = 100, z (1.96=95%) = 1.96 the result is 0.098 (±z·√(p(1−p)/n)).
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.