Stats Calculator Online
Grades & GPA Calculators
Course grades, finals, and grade point averages. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- Grade Calculator CalculatorWeighted course grade from scores and weights
- Final Exam Grade CalculatorScore needed on the final to hit a target course grade
- GPA Calculator CalculatorGrade point average from letter grades and credits
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