Free Math Calculators – Page 4

100+ free calculators and solvers with step-by-step working and graphs. Every answer is checked. Free to use. No sign-up needed.

Geometry & Coordinate Geometry

∥⊥ Parallel & Perpendicular Line CalculatorFind the equations of the lines parallel and perpendicular to y = mx + c through a given point, using equal and negative reciprocal slopes. Graph

Trigonometry

sin Trigonometry CalculatorFind sin, cos, tan, csc, sec and cot of any angle in degrees or radians. Graph °→π Degrees to Radians CalculatorConvert degrees to radians as an exact multiple of π (like 135° = 3π/4) and as a decimal, with the steps and a unit circle diagram. Graph π→° Radians to Degrees CalculatorConvert radians to degrees, including inputs like 5pi/6, with degrees-minutes-seconds and a unit circle diagram. Graph ∿ Sine & Cosine Graph CalculatorGraph y = A sin(Bx + C) + D or the cosine version and find the amplitude, period, phase shift, midline and range, with an animated wave. Graph ◺ Right Triangle CalculatorSolve a right triangle from two sides or a side and an angle using sin, cos, tan and Pythagoras. Graph

Statistics & Probability

x̃ Mean, Median & Mode CalculatorFind the mean, median, mode and range of a data set. Graph σ Standard Deviation CalculatorCalculate the standard deviation and variance of a data set, for a sample or a population, with the deviations table and every step shown. Graph N Normal Distribution CalculatorFind normal probabilities P(X < a), P(X > a) or P(a < X < b) from the mean and standard deviation, with z-scores and a shaded bell curve. Graph nCk Binomial Distribution CalculatorCalculate binomial probabilities for exactly, at most or at least k successes in n trials. Graph nPr Permutation & Combination CalculatorCalculate permutations (nPr) and combinations (nCr) exactly, even for large numbers, plus the counts with repetition. z Z-Score CalculatorFind the z-score of a value from the mean and standard deviation, plus its percentile under the normal curve, with steps and a shaded bell curve. Graph r Linear Regression CalculatorFind the least-squares line of best fit y = mx + c, the correlation coefficient r and r², with a scatter plot showing the residuals. Graph Q₁Q₃ Box Plot & Quartile CalculatorFind the five-number summary, quartiles, interquartile range and outliers of a data set, and draw an animated box-and-whisker plot. Graph λ Poisson Distribution CalculatorFind Poisson probabilities for exactly, at most or at least k events given an average rate λ, with the formula and a bar chart. Graph σ² Variance CalculatorCalculate the exact variance of a data set for a sample or a population, with the squared deviations shown and the shortcut formula check. Graph %ile Percentile Rank CalculatorFind the percentile rank of a value in a data set: the percentage of values below it, counting ties fairly, with a highlighted chart. Graph P(A) Probability CalculatorFind P(A and B), P(A or B), P(not A) and P(A given B) for independent, mutually exclusive or related events, exactly with fractions. Graph E(X) Expected Value CalculatorFind the expected value, variance and standard deviation of a discrete probability distribution, exactly, with a bar chart. Graph CI Confidence Interval CalculatorFind a confidence interval for a mean from the sample mean, standard deviation and sample size at 80–99% confidence, with the margin of error. Graph