Education & Statistics
Grades, GPA with configurable scales, study planning, probability, distributions, regression and algebra solvers.
- Grade Percentage CalculatorTurn points earned into a percentage score and letter grade using a grading scale you can customise.
- Final Exam Score CalculatorFind the score you need on a final exam to reach a target course grade, given your current grade and the exam’s weight.
- Weighted Grade CalculatorCalculate a course grade from category scores and weights (homework, quizzes, exams), normalising weights that do not add to 100 %.
- GPA CalculatorCalculate GPA from letter or numeric grades and credit hours, with US 4.0, 4.3 or numeric grading scales.
- CGPA CalculatorCombine term GPAs and credits into a cumulative GPA (CGPA) and find the term GPA needed next to hit a target.
- Grade Point Conversion CalculatorConvert between percentages, 4.0 GPA and 10-point CGPA using common conventions, or rescale any grade linearly.
- Study Time PlannerDivide your available study hours across subjects by priority, with hours per week, per day and in total before exams.
- Required Study Hours CalculatorEstimate weekly and term study hours from credit hours using the common hours-per-credit guideline.
- Probability CalculatorCalculate P(A and B), P(A or B), P(not A), conditional probability and more for independent, exclusive or joint events.
- Permutation CalculatorCount permutations P(n, r) — ordered arrangements — with or without repetition, exactly for large values.
- Combination CalculatorCount combinations C(n, r) — selections where order does not matter — with or without repetition, exactly.
- Binomial Probability CalculatorCalculate binomial probabilities P(X = k), P(X ≤ k) and P(X ≥ k), with the mean and standard deviation.
- Normal Distribution CalculatorFind normal distribution probabilities below, above or between values, and the value at a given cumulative probability.
- Z-Score CalculatorCalculate a z-score (standard score) and its percentile under the normal model.
- Confidence Interval CalculatorCalculate a confidence interval for a mean using Student’s t (sample SD) or z (known SD), with margin of error and standard error.
- Margin of Error CalculatorCalculate the margin of error for a survey proportion at a chosen confidence level, with optional finite population correction.
- Sample Size EstimatorEstimate the survey sample size needed for a margin of error and confidence level, with finite population correction and response rate.
- Correlation Coefficient CalculatorCalculate Pearson’s r, r² and Spearman’s rank correlation for paired data.
- Linear Regression CalculatorFit a least-squares line to paired data with slope, intercept, R², standard error of the slope and a prediction.
- Slope CalculatorFind the slope between two points, the line’s equation, its angle and grade.
- Distance Formula CalculatorCalculate the distance between two points in 2D or 3D, plus the squared and Manhattan distances.
- Midpoint CalculatorFind the midpoint between two points in 2D or 3D coordinates.
- Pythagorean Theorem CalculatorSolve a right triangle for the hypotenuse or a missing leg with a² + b² = c², plus area, perimeter and angles.
- Quadratic Equation SolverSolve ax² + bx + c = 0 for real or complex roots, with the discriminant and vertex, using a numerically stable formula.
- Arithmetic Sequence CalculatorFind the nth term and the sum of an arithmetic sequence from the first term and common difference.