Math & Numbers
Convert milligrams to grams with configurable decimal precision
mg-to-gMath & Numbers
Test paired binary categorical changes with exact binomial or continuity-corrected chi-square McNemar test
mcnemar-test-calculatorMath & Numbers
Calculate mean absolute deviation around the mean or median for an easy-to-read spread measure
mean-absolute-deviation-calculatorMath & Numbers
Calculate the midrange of a numeric dataset as the average of its minimum and maximum values
midrange-calculatorMath & Numbers
Calculate the arithmetic mean of a numeric dataset and review the main supporting statistics
mean-calculatorMath & Numbers
Find the median of a dataset, inspect the sorted sequence, and optionally review quartiles and interquartile range
median-calculatorMath & Numbers
Find the most frequent value or values in a dataset and inspect the supporting frequency distribution
mode-calculatorMath & Numbers
Compute the inverse of a square matrix using Gauss-Jordan elimination and report when inversion is impossible
matrix-inverse-calculatorMath & Numbers
Multiply two matrices and return the product with dimension checks and optional step explanations
matrix-multiplication-calculatorMath & Numbers
Convert miles to kilometers with configurable decimal precision
miles-to-kmMath & Numbers
Convert meters to feet with configurable decimal precision
meter-to-feetMath & Numbers
Convert luminance between cd/m² (nit, SI base), stilb (1 = 10000 cd/m²), cd/ft² (1 = 10.76391 cd/m²), foot-lambert (1 = 3.426263 cd/m²), apostilb (1 = 0.31831 cd/m²), lambert (1 = 3183.099 cd/m²), and millilambert (1 = 3.183099 cd/m²). All non-SI units except stilb carry a 1/π factor from Lambertian diffuse-emission assumptions. Reference values: LCD display ≈ 200–300, comfortable eye level ≈ 1000, sun surface ≈ 1.6×10⁹ cd/m².
luminance-converter