Explore calculators in this category.
Measure the straight-line distance between two coordinates on a 2D plane for navigation, mapping, or geometry problems.
Evaluate the determinant of any 3×3 matrix to test invertibility, compute cross products, or solve linear systems.
Calculate the distance along a circle's edge from its radius and central angle.
Find the sum of the first n terms in an arithmetic series using the formula S = n/2 × (2a₁ + (n−1)d).
Determine the width-to-height ratio of a rectangle.
Compute average speed from distance traveled and time taken.
Update prior probabilities with new evidence using Bayes' theorem to support diagnostic testing, risk analysis, and data science modeling.
Work out the traffic per variant required for a Bayesian conversion test given priors, lift targets, and credibility.
Estimate sessions per variant for a Bayesian proportion test using desired uplift, credibility, and probability to beat control.
Paste transaction amounts or other positive numbers to estimate how closely their first digits align with the Benford distribution.
Enter observed and expected values for up to three categories to calculate the chi-square statistic for a goodness of fit test.
Compute the area enclosed by a circle using the formula A = πr².
Compute the circumference of a circle from its radius.
Derive circumference when only area is known.
Calculate the area of a circular sector from its radius and central angle.
Calculate the coefficient of variation (CV) to compare variability across datasets.
Compute n choose r combinations.
Enter sample mean, standard deviation, sample size and confidence level to calculate the confidence interval around the mean.
Find the best rational approximation of a real number using continued fractions within your chosen denominator limit.
Find the volume of a cube from its side length.
Calculate the volume of a cylinder from radius and height.
Solve a direct rule-of-three proportion by entering the three known quantities.
Divide one number by another to find the quotient.
Find the area of an ellipse from its semi-major and semi-minor axes.
Find percentage of evidence weight vs total.
Multiply all positive integers up to n to find n factorial.
Compute any Fibonacci number using Binet's formula by specifying its position in the sequence.
Convert a fraction to decimal form.
Compute the geometric mean of two values.
Sum of the first n terms of a geometric series.
Compute the longer side of a rectangle using the golden ratio.
Compute the average from three test scores.
Compute the greatest common divisor of two numbers using the Euclidean algorithm.
Compute the harmonic mean of three values.
Find the harmonic mean of three positive numbers, useful for averaging rates.
Compute slope percentage of a hike.
Compute the smallest common multiple shared by two integers.
Find the least common multiple of three integers.
Compute mechanical advantage of a lever.
Enter the number of observations plus the summed products needed for simple linear regression to predict a y value for any target x. The result follows the least-squares best-fit line for your summarized dataset.
Compute a future value interval for simple linear regression using the point estimate, residual standard error, sample size, and leverage.
Scale base default expectations by a macro stress multiple to estimate charge-offs, loss rates, and buffer gaps.
Convert log base using natural logarithms.
Convert logistic regression coefficients and feature values into an easy-to-read predicted probability.
Estimate how many participants you need per group for a Mann–Whitney U test based on desired power, alpha, and probability of superiority.
Average distance of numbers from their mean.
Find the median value among three numbers.
Compute the non-negative remainder after dividing one number by another.
Find real-number nth roots with safeguards for zero or negative bases, clear guidance on valid inputs, and worked examples.
Calculate what percentage a value represents of a whole.
Calculate the t statistic and two-tailed p-value for a Pearson correlation using sample size.
Find the percent error between a measured quantity and its true value.
Calculate the percentage gain from an original value to a new value.
Find the number of ordered arrangements of r items selected from n distinct items.
Compute Poisson distribution probabilities for event counts.
Number of diagonals in an n‑sided polygon.
Compute the exterior angle of a regular polygon by dividing 360° by the number of sides.
Total degrees of a polygon's interior angles.
Enter coefficients for a polynomial up to degree four to compute all real and complex roots.
Determine the size of a power set by raising 2 to the number of elements.
Enter an integer to see its prime factors expressed in a multiplication sequence.
Estimate statistical power for matched treated and control cohorts, then see how many controls you need to hit 80% power.
Calculate the hypotenuse of a right triangle. Enter the values and press Calculate.
Compute the discriminant D = b² − 4ac.
Largest real root of ax² + bx + c = 0.
Find the x-coordinate of a parabola's vertex with step-by-step context for graphing y = ax² + bx + c, plus tips for interpreting maxima and minima.
Compute the area of any rectangle from its length and width, with guidance on unit consistency and practical use cases.
Compute the volume of a rectangular prism from its length, width, and height. Enter the dimensions and press Calculate.
Find the area of a regular hexagon using the standard formula based on side length. Enter the side length and press Calculate.
Calculate how long a road trip will take by combining driving speed, distance, and planned stop durations.
Compute the diagonal length of a rectangular room.
Estimate years to double an investment using the rule of 72.
Enter A, B, and C to solve for X in the proportion A/B = C/X.
Generate O'Brien-Fleming or Pocock alpha-spending boundaries across interim looks to keep cumulative error on target.
Find the slope of a line through two points.
Surface area of a sphere from its radius.
Calculate the volume enclosed by a sphere from its radius, using the exact 4⁄3 π r³ formula with guidance on unit handling.
Compute the sample standard deviation for three data points.
Compute the sum of the squares of the first n natural numbers.
Area of a triangle from three sides using Heron's formula.
Area from base and height.
Compute radius of the inscribed circle of a triangle.
Sum of the first n natural numbers.
Find volume of a triangular prism from its dimensions.
Find the magnitude of a three-dimensional vector from its components using the square root of the sum of squares.
Find the weighted average of up to three data points.
Convert weighted distributions into percentile ranks by combining cumulative weight, weight at the score, and total weight.
Find how many standard deviations a value is from the mean.
