99% Confidence Interval Calculator
Free calculate 99% confidence intervals for population means and proportions. Get instant, accurate results with our easy-to-use calculator.
Confidence Interval Settings
99% Confidence Interval
Enter data to calculate confidence interval
About 99% Confidence Intervals
Interpretation
- • 99% confidence level
- • α = 0.01 significance level
- • Critical value: ±2.576
- • Widest confidence interval
When to Use
- • High-stakes decisions
- • Medical research
- • Safety-critical applications
- • Conservative estimates