Stats Calculator Online
Percentages Calculators
Percent of, change, difference, increase/decrease, and conversions. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- Percentage Calculator CalculatorCompute p% of x, or what percent one value is of another
- Percent Change CalculatorPercent increase or decrease from one value to another
- Percent Difference CalculatorRelative difference between two values
- Percentage Increase CalculatorIncrease a value by a given percent
- Percentage Decrease CalculatorDecrease a value by a given percent
- Percent Tolerance CalculatorCheck whether a measurement is within tolerance
- Decimal to Percent CalculatorConvert a decimal to a percentage
- Percent to Decimal CalculatorConvert a percentage to a decimal
- Percent to Fraction CalculatorConvert a percentage to a simplified fraction
- Fraction to Percent CalculatorConvert a fraction to a percentage
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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- One-Sample t-Test CalculatorHypothesis Testing · Test a sample mean against a hypothesized value
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- 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