CalcConfidence Interval Calculator
Last updated: 2026-08-24
Confidence Interval Calculator — Calculate confidence interval for mean.
Inputs
Result
Enter values and press Calculate
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How to use it
- Determine the nivel of confianza and value z
- Calculate the error standard (σ/√n)
- Multiply z per the error standard
- Add and Subtract a the mean
Common mistakes
- ⚠️ Muestra lesser a 2
- ⚠️ Desviación standard in cero
- ⚠️ Nivel of confianza fuera of range
Worked example
Calculate 95% CI: mean=50, sd=10, n=100.
The intervalo of confianza estimate dónde is the verdadero parámetro poblacional.
Input guide
| Field | Typical range |
|---|---|
| confianza | 1-99.9 |
| desviacion | 0.001-1,000,000,000,000 |
| media | 0-1,000,000,000,000 |
| n | 2-1,000,000,000 |