Free online math calculators for statistics and probability, built for students and teachers. Each one shows step-by-step working, a chart, and the exact TI-84 keystrokes so you can check the answer on your own calculator. Prefer a full emulator? Use our free TI-84 calculator online.
Descriptive Statistics Calculators
Summarize a data set: center, spread and position.
Descriptive
Standard Deviation Calculator
Sample and population standard deviation, variance, mean and quartiles with steps. Paste data straight from Excel.
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Probability Distribution Calculators
Find probabilities, percentiles and critical values.
Distribution
Normal Distribution Calculator
normalcdf, invNorm and normalpdf with a shaded bell curve, step-by-step work and TI-84 keys.
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Distribution
Binomial Distribution Calculator
binompdf and binomcdf for exactly, at most, at least or between, with a chart and table.
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Distribution
Z-Score Calculator
Raw score to z, z to percentile and p-value, percentile to z, and outliers in a data set.
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Statistical Inference Calculators
Estimate population values from a sample.
Inference
Confidence Interval Calculator
Confidence intervals for means (z or t), proportions and two samples, with margin of error.
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Regression Calculators
Model the relationship between two variables.
Regression
Linear Regression Calculator
Line of best fit, slope, r, r², p-value, residuals and a scatter plot, plus TI-84 LinReg keys.
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Online TI Calculators
Prefer to work on a calculator screen? These free emulators run Texas Instruments models in your browser.
TI-84 Calculator
Free TI-84 calculator online: graphing, stats and programs in your browser.
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Graphing Calculator
Plot functions and find intersections with a free graphing calculator.
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Frequently Asked Questions
Are these math calculators free?
Yes. Every calculator on TI84CalcPro is free, works in your browser on phone or desktop, and needs no download or sign-up.
Do the calculators show steps?
Yes. Each statistics calculator shows the formula, the step-by-step working and a plain-English interpretation of the result.
Can I check my answers on a real TI-84?
Yes. Every calculator lists the exact TI-84 keystrokes using your numbers, such as normalcdf, binomcdf, 1-Var Stats, LinReg and ZInterval.
Which calculator should I use for a statistics class?
Start with the standard deviation calculator for summary stats, use the normal, binomial or z-score calculators for probabilities, the confidence interval calculator for estimation and the linear regression calculator for relationships between two variables.