Statistics Calculators
19 calculatorsAnalyze data with calculators for probability, distributions, descriptive statistics, and statistical tests.
19 calculators available
Probability(5)↑ top
Binomial Calculator
Compute binomial probabilities for the number of successes i…
Card Counting Calculator
Learn and practice the Hi-Lo card counting system: convert y…
Coin Flipper
Flip a fair coin any number of times online and watch the he…
Odds Calculator
Calculate odds for and against any event from favorable and …
Probability Calculator
Calculate probability for single and multiple events, plus c…
Tests & Inference(4)↑ top
Chi-Square Calculator
Compute the chi-square goodness-of-fit statistic and degrees…
Confidence Interval Calculator
Calculate confidence intervals for sample means and proporti…
Regression Calculator
Fit a simple linear regression line to paired data and get t…
T-Test Calculator
Run an independent two-sample t-test to compare two means an…
Distributions(3)↑ top
Normal Distribution Calculator
Compute normal distribution probabilities, z-scores, and per…
Poisson Calculator
Compute Poisson probabilities P(X=k), P(X≤k), and P(X≥k) for…
Z-Score Calculator
Calculate z-scores to see how many standard deviations a val…
Descriptive(6)↑ top
Percentile Calculator
Calculate the value at any percentile and the percentile ran…
Quartile Calculator
Calculate Q1, Q2 (median), Q3, and the interquartile range f…
Standard Deviation Calculator
Calculate standard deviation, variance, and mean for any dat…
Standard Error Calculator
Compute the standard error of a mean or proportion from stan…
Statistics Calculator
Get mean, median, mode, range, variance, and standard deviat…
Variance Calculator
Calculate sample and population variance, standard deviation…
Experimental Design(1)↑ top
Frequently Asked Questions
- ❓ What is a normal distribution?
- ✅ A normal distribution (bell curve) is symmetric around the mean, where about 68% of values fall within one standard deviation, 95% within two, and 99.7% within three.
- ❓ What is the difference between population and sample standard deviation?
- ✅ Population standard deviation divides by N; sample standard deviation divides by N-1 to correct bias from estimating the mean. Use sample (s) when working with a subset of data.
- ❓ When do I use a z-score vs a t-score?
- ✅ Use a z-score when the population standard deviation is known or the sample is large (n ≥ 30). Use a t-score when the population SD is unknown and the sample is small.