Math & Numbers
Convert square meters to square feet with configurable decimal precision
square-meter-to-square-feetMath & Numbers
Convert square meters to square yards with configurable decimal precision
square-meter-to-square-yardText Processing
Convert Simplified Chinese text to Traditional Chinese with OpenCC phrase conversion
simplified-to-traditional-chinese-converterMath & Numbers
Convert stone to pounds with configurable decimal precision
stone-to-lbMath & Numbers
Convert stone to kilograms with configurable decimal precision
stone-to-kgMath & Numbers
Find slope, y-intercept, and line equation from two points or multiple paired observations
slope-intercept-calculatorMath & Numbers
Calculate the standard error of the mean from raw sample values or summary statistics
standard-error-calculatorMath & Numbers
Estimate statistical power for one-sample mean or proportion tests using sample size, alpha, and expected effect
statistical-power-calculatorMath & Numbers
Calculate standard normal PDF, CDF, tail probability, two-tail probability, and central area from a z-score
standard-normal-calculatorMath & Numbers
Calculate Spearman rank correlation for paired numeric data with tied-rank handling
spearman-correlation-calculatorMath & Numbers
Calculate sample and population skewness to measure distribution asymmetry
skewness-calculatorMath & Numbers
Calculate sample and population standard deviation, variance, coefficient of variation, and sigma intervals
standard-deviation-calculator