Compare calculators

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

Binomial Probability Calculator

Compute the exact probability of getting exactly k successes in n independent trials, each with probability p. Use this when modeling coin flips, quality control tests, or any repeated yes/no experiment.

Number of Trials (n)

Number of Successes (k)

Probability of Success (p)

Fill in the required fields to see your result.

Statistics

Confidence Interval Calculator

Compute the margin of error around a sample mean for a 90%, 95%, or 99% confidence interval using the z-distribution. The half-width of the CI tells you how precisely your sample estimates the population mean — essential for survey reporting, scientific publication, and any inference.

Sample Size (n)

Standard Deviation

Confidence Level

Fill in the required fields to see your result.

Key differences

	Binomial Probability Calculator	Confidence Interval Calculator
Category	Statistics	Statistics
Inputs required	3	3
Result	Binomial Probability	Margin of Error (±)
What it does	Compute the exact probability of getting exactly k successes in n independent trials, each with probability p. Use this when modeling coin flips, quality control tests, or any repeated yes/no experiment.	Compute the margin of error around a sample mean for a 90%, 95%, or 99% confidence interval using the z-distribution. The half-width of the CI tells you how precisely your sample estimates the population mean — essential for survey reporting, scientific publication, and any inference.