Advanced Free Online Calculators

Free hexagon calculator. Enter side, area, perimeter, diagonal, or apothem to solve the rest. Regular hexagon area formula A = (3√3/2)a² with examples.

Free equilateral triangle calculator. Enter side, height, area, or perimeter to solve the rest. Area formula A = (√3/4)a² with height, radii, and examples.

Free sphere volume calculator. Solve from radius, circumference, or volume. Sphere volume formula V = 4/3 πr³ explained with worked examples and a table.

Free cone volume calculator. Solve solid or truncated cone (frustum) volume from radius or diameter. Cone volume formula V = ⅓πr²h with worked examples.

Free cylinder volume calculator. Solve solid or hollow cylinder (pipe) volume from radius or diameter. Cylinder volume formula V = πr²h with liters and gallons.

Free area of a triangle calculator. Solve from base and height, three sides, or two sides and an angle. Triangle area formula A = ½ × b × h explained with examples.

Free perimeter of a circle calculator. Solve circumference from radius, diameter, or area. Circle perimeter formula p = 2πr explained with examples and a table.

Free Pythagorean theorem calculator. Enter any two sides to find the third with a² + b² = c². Solve the hypotenuse or a leg, plus area and perimeter.

Free trapezoid area calculator. Solve area from two bases and height, plus perimeter and angles from the legs. Trapezoid area formula A = ((a+b)/2)h explained.

Free hemisphere volume calculator. Solve from radius, diameter, or volume, plus surface areas. Hemisphere volume formula V = 2/3 πr³ with worked examples.

Free area of a square calculator. Enter side, diagonal, perimeter, or area to solve the rest instantly. Square area formula A = a² explained with examples.

Free pyramid volume calculator. Solve square, rectangular, or regular polygon base pyramids. Pyramid volume formula V = ⅓ × base area × height with examples.

Free area of a rectangle calculator. Enter any two values to solve area, perimeter, sides, or diagonal instantly. Rectangle area formula A = a × b explained.

Free arc length calculator. Solve arc length, sector area, and chord from angle and radius. Arc length formula L = rθ in degrees or radians with examples.

Ratio calculator to solve A:B=C:D, simplify ratios, check equivalents, and scale by total. Free step-by-step answers with worked examples.

Square root calculator with steps. Get the exact radical and decimal for any number, plus cube roots, fractions, and negative roots. √72 = 6√2 ≈ 8.4853.

Mean absolute deviation calculator with steps. Get the MAD, mean, and full working table for any data set. MAD of 9, 13, 43, 55 is 19. Free MAD solver.

Free test grade calculator. Enter questions wrong or your score to get the percentage and letter grade, plus how many you can miss for an A, B, or C.

BODMAS and PEMDAS calculator with steps. Enter any expression and see each operation solved in order: brackets, exponents, division, multiplication, addition, subtraction.

Percentile calculator with steps. Find the value at any percentile, or the percentile rank of a number. 25th percentile of 45–90 is 56.25. Free solver.

Sample size calculator for surveys and research. Find how many people to survey at any confidence level. 95% confidence, 5% margin needs 385. Free, with steps.

Proportion calculator that solves for x with full steps. Enter three values, leave one blank, and get the missing number instantly. Fractions and decimals too.

Free point slope form calculator. Enter a point and slope or two points to get point slope, slope intercept, and standard form with steps.

Free scatter plot maker. Paste your X and Y data to plot points, add a line of best fit, and get the correlation r and R squared instantly.

Confidence interval calculator with steps. Enter your mean, SD, and sample size to get the 95% CI, margin of error, and critical value, using t or z correctly.

Axis of symmetry calculator finds x = -b/2a instantly. Enter standard, vertex, or factored form for the axis, vertex, and graph with full steps.

Free correlation coefficient calculator. Enter your X and Y data to get Pearson r, R squared, covariance, and a step by step solution with a scatter plot.

Free log calculator finds log base 10, base 2, or any custom base with step-by-step solutions. Solve exact log values and doubling-time problems fast.

Antilog calculator finds the inverse log in base 10 or e. See the antilog formula, worked examples (1.5, -1, 2, 2.303) and a full antilog value table.

Free slope intercept form calculator. Enter two points, a slope, or an equation like 4x-20y=-160 to find y = mx + b with steps and a graph.

Free covariance calculator with step-by-step solution. Enter X and Y values for sample or population covariance, mean deviations, and worked examples.

Free one-way ANOVA calculator. Enter your groups to get the F statistic, p-value, and a full ANOVA table with step-by-step working. Worked examples included.

Geometric Mean Calculator with steps. Find the geometric mean of any numbers instantly, plus worked answers for common pairs like 9 and 25 or 8 and 32.

Free critical value calculator for z, t, chi-square, and F tests. Get exact one- and two-tailed values with steps, plus full z and t critical value tables.

Free degrees of freedom calculator finds df for t-tests, chi square, ANOVA & regression. Every formula, step-by-step, plus a full df reference table.

Linear regression calculator finds y = mx + b, slope, intercept, r and R2 from your data. See worked examples and how to do linear regression by hand.

Quadratic formula calculator solves ax²+bx+c=0 with full steps, roots, and discriminant. Paste your equation and get worked-out answers instantly.

Free quadratic regression calculator finds the y = ax² + bx + c equation and R² from your data, with full step-by-step working and worked examples.

Sum of squares calculator with the SS formula: SS = Σ(x − x̄)². Enter your data to get the mean, each squared deviation, and the total, with steps shown.

Free 5 number summary calculator with steps. Find min, Q1, median, Q3, max, then build a box plot. Solved examples for any dataset.

Free variance calculator finds sample and population variance with step-by-step solution, mean, sum of squares, and standard deviation. Enter data, get answer.

Coefficient of variation calculator finds CV % from your data with mean, standard deviation, and full step-by-step working. Sample or population, free.

Outlier calculator finds Q1, Q3, IQR and the upper and lower boundaries using the 1.5 IQR rule. Enter your data set and detect outliers in seconds.

Free binomial distribution calculator. Find P(X=x), P(X≤x), P(X≥x), nCx, mean & standard deviation with step-by-step solutions and worked examples.

Free p value calculator. Enter a z score, t value, chi-square or F statistic and get the exact p value with full working shown, step by step.

Free hypothesis testing calculator for one-sample mean tests. Get the test statistic, critical value, p-value, and a clear reject or accept H0 decision with steps.

Chi square calculator with steps. Get the χ² statistic, degrees of freedom, p value, and the expected frequency for every cell, for goodness of fit or independence.

Standard error calculator with the SE formula: SE = SD / √n. Enter your SD and sample size, or raw data, for the standard error with full steps shown.

Free pie chart generator. Enter your labels and values to make a pie or donut chart with percentages, then download it as a PNG. No sign up, no skills needed.

Free standard deviation calculator with steps. Find sample or population SD, mean, and variance instantly. See the full worked solution for any data set.

Free sig fig calculator counts significant figures, rounds to any number of sig figs, and solves multiplication and addition with correct rounding. See steps.

Find the mean, median, mode, and range of any data set with full steps and worked examples. Free calculator with a sorted table and clear solution for each answer.

Free percentage calculator. Find what X% of Y is, what percent one number is of another, and percent increase or decrease with full worked steps.