Stats Calculator Online
Plane Geometry Calculators
Circles, triangles, polygons, distance, midpoint, and slope. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- Circle CalculatorCircumference, area, and diameter
- Rectangle CalculatorArea, perimeter, and diagonal
- Square CalculatorArea, perimeter, and diagonal
- Triangle (Heron) CalculatorArea and perimeter from three sides
- Right Triangle CalculatorHypotenuse, area, and perimeter
- Pythagorean Theorem CalculatorSolve for hypotenuse or a leg
- Trapezoid CalculatorArea from bases and height
- Parallelogram CalculatorArea from base and height
- Rhombus CalculatorArea and side from diagonals
- Distance Between Points Calculator2D Euclidean distance
- Midpoint CalculatorMidpoint of a line segment
- Slope CalculatorSlope and angle between two points
- Annulus CalculatorArea of a ring between two radii
Tidbits from Stats Calculator Online
Tidbit
A p-value is not the probability H₀ is true
It is the probability of data at least as extreme as yours if H₀ were true. Pair it with an effect size and confidence interval.
P-value calculator →Need a path?
Not sure which test to run?
Start with the statistical test selector, then open the matching calculator with formulas and APA export.
Test selector →Remember
Correlation is not causation
Pearson r measures linear association. Plot the scatter first, and prefer Spearman when the relationship is monotonic but not linear.
Correlation tools →
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Cross-topic picks from Stats Calculator Online
- One-Sample t-Test CalculatorHypothesis Testing · Test a sample mean against a hypothesized value
- Mean, Median, Mode CalculatorDescriptive Statistics · Calculate arithmetic mean, median, and mode
- Normal Distribution CalculatorProbability Distributions · PDF, CDF, and quantiles of the normal
- Simple Linear Regression CalculatorRegression Analysis · Fit y = a + bx with inference
- Chi-Square Independence CalculatorHypothesis Testing · Test association in contingency tables
- Sample Size & Power CalculatorHypothesis Testing · Plan sample size for desired power