在线计算器

Measure a regular pentagon from one side length for geometry and design layouts.

Measure a regular octagon from one side length for geometry and layout planning.

Measure a hemisphere from radius for geometry, container sizing, and quick planning.

Measure a rectangular pyramid from length, width, and vertical height.

Measure a square pyramid from base side length and vertical height.

Measure a cube from a single side length for geometry, packaging, and quick sizing checks.

Measure ellipse area and circumference from the two semi-axis lengths.

Estimate margin of error for a mean using standard deviation, sample size, and a common confidence level.

Estimate the standard error of the mean from sample values.

Compare variability relative to the mean using coefficient of variation.