Confidence Interval Calculator
Calculate confidence intervals for a population mean using sample mean, standard deviation, and sample size with 90%, 95%, 99%, or 99.9% confidence levels.
How to Use Confidence Interval Calculator
Enter your sample mean, standard deviation, and sample size, then select a confidence level. The calculator computes the confidence interval bounds, margin of error, and standard error using the z-score method.
Step-by-Step Instructions
- Enter the sample mean, standard deviation, and sample size
- Select the desired confidence level (90%, 95%, 99%, or 99.9%)
- Click Calculate to compute the confidence interval
- View the interval bounds, margin of error, and formula
Related Tools
Percentage Calculator
Calculate percentages, percentage changes, and percentage differences.
BMI Calculator
Calculate Body Mass Index from height and weight with category display.
Loan and Mortgage Calculator
Calculate monthly payments, total interest, and amortization schedules.
Tip Calculator
Calculate tip amounts and split bills between multiple people.