Advanced Free Online Calculators

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.

Convert ml to oz instantly. 1 US fl oz is 29.57 ml, UK is 28.41 ml. Free converter with cups, tablespoons, liters, and a full mL to fluid ounce chart.

Convert oz to ml instantly. 1 US fluid ounce is 29.57 ml, UK is 28.41 ml. Free converter with cups, tablespoons, liters, and a full fl oz to mL chart.

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 with steps. Enter your data to get the CV, mean, and standard deviation, using the formula CV = (SD ÷ mean) × 100.

Outlier calculator using the 1.5 IQR rule. Enter your data to find Q1, Q3, IQR, and the upper and lower outlier boundaries, with every step shown.

Calculate binomial probabilities easily with our Binomial Distribution Calculator. Find results instantly using the binomial distribution formula online.

P value calculator for z, t, chi square, F, and r tests. Enter your test statistic to get the exact p value, with the steps and significance decision shown.

Perform hypothesis tests online with our Hypothesis Testing Calculator. Calculate p values, test statistics & significance levels for z, t, and chi square test.

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.

Create a pie chart instantly with our free Pie Chart Maker. Enter values, customize colors, and download your chart. Perfect for reports, Excel & Google Sheets.

Standard Deviation Calculator for fast mean, variance, and SD results. Learn how to calculate standard deviation with formulas and examples.

Sig fig calculator. Count sig figs in any number, round to N sig figs, and apply the correct rules for addition and multiplication, with steps.

Mean, median, mode, and range calculator with steps. Enter your numbers to get all four at once, plus the frequency table and how each answer was found.