Math

Find distance, speed, or time, compare 2D or 3D points, and measure Earth-surface distance from latitude and longitude.

Enter one circle measure to find radius, diameter, circumference, and area with matching units and clear formulas.

Find total or lateral surface area for common 3D shapes, with formulas, unit choices, and clear area breakdowns.

Find nth terms, sums, ratios, differences, and Fibonacci values, plus a pattern check and term preview.

Calculate survey sample size or margin of error with finite population correction, design effect, and response-rate planning.

Calculate common probabilities for two events, including and, or, neither, only one, and conditional probability.

Paste numbers to get mean, median, mode, quartiles, variance, standard deviation, outliers, and a frequency table fast.

Calculate mean, median, mode, range, count, sum, min, and max from a pasted number list with a cleaned sorted-data check.

Calculate permutations and combinations with or without repetition, plus a small listing preview to check your counting model.

Find a missing side or check if 3 sides make a right triangle with clear steps, tolerance control, and input validation.