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Both calculators run independently — change the inputs on either side to compare results.

Confidence Interval Calculator

Computes the range of values likely to contain a true population mean at your chosen confidence level. Use it when reporting survey results, clinical trial outcomes, or any estimate derived from a sample.

Sample Mean

Sample Standard Deviation

Sample Size (n) (observations)

Confidence Level

Distribution Type

Fill in the required fields to see your result.

Probability

Normal Distribution Calculator

Compute left-tail, right-tail, or two-tail probabilities for any normal distribution given its mean and standard deviation. Widely used in statistics, finance, and scientific research.

Mean (μ)

Standard Deviation (σ)

X Value

Tail Type

Fill in the required fields to see your result.

Key differences

	Confidence Interval Calculator	Normal Distribution Calculator
Category	Probability	Probability
Inputs required	5	4
Result	Margin of Error (±)	Probability
What it does	Computes the range of values likely to contain a true population mean at your chosen confidence level. Use it when reporting survey results, clinical trial outcomes, or any estimate derived from a sample.	Compute left-tail, right-tail, or two-tail probabilities for any normal distribution given its mean and standard deviation. Widely used in statistics, finance, and scientific research.