Stats Calculator Online
Algebra Calculators
Absolute values, roots, exponents, and quadratic equations. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- Absolute Value CalculatorCompute |x|
- Absolute Difference CalculatorCompute |A − B|
- Square Calculator CalculatorCompute x²
- Cube Calculator CalculatorCompute x³
- Square Root CalculatorCompute √x
- Cube Root CalculatorCompute ∛x
- Nth Root CalculatorCompute the n-th root of x
- Exponent Calculator CalculatorCompute base^exponent
- Quadratic Formula CalculatorSolve ax² + bx + c = 0
- Logarithm Calculatorlog base b of a, plus ln and log10
- Simplify Radicals CalculatorPull perfect squares out of √n
- FOIL Calculator CalculatorExpand (ax+b)(cx+d)
- Difference of Squares Calculatora² − b² and factored form
- Completing the Square CalculatorRewrite ax²+bx+c in vertex form
- Cubic Equation CalculatorApproximate roots of ax³+bx²+cx+d=0
- Dot Product CalculatorDot product of two vectors
Tidbits from Stats Calculator Online
Plan ahead
Power before you collect data
Fix the smallest meaningful effect and α, then compute sample size. Inflate n for dropout when recruiting humans.
Sample size calculator →Everyday math
Percent change ≠ percent of
Percent of is part÷whole. Percent change uses the starting value in the denominator—and +50% then −50% does not return to start.
Percentage calculators →Quick tip
Sample vs population SD
Use n−1 (sample) when your data are a subset of a larger group; use n when you truly have the whole population.
Open SD calculator →
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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