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  Standard Deviation Calculator 2026 🌙 Dark Mode Calculate population and sample standard deviation, variance, mean, median, mode, quartiles, outliers, skewness, kurtosis, confidence intervals, and more — with full step-by-step solutions, visual charts, and grouped/frequency data support, all computed privately in your browser. Enter Your Data Data (comma, space, or newline separated) 📁 Upload CSV/TXT 🎲 Random Dataset Calculation Type Sample (n-1) Population (n) Rounding Precision 2 decimals 4 decimals 6 decimals Calculate Core Results Standard Deviation - Variance - Mean (Average) - Median - Mode - Range - Sum - Count (n) - Advanced Statistics Standard Error of the Mean (SEM) - Coefficient of Variation (CV%) - Skewness ⓘ - Kurtosis ⓘ - Q1 (25th Percentile) - Q2 / Median (50th Percentile) - Q3 (75th Percentile) - Interquartile Range (IQR) - Custom Percentile Finder Find Confidence Level 90% 95% 99% Calculate CI Outlier...

  Ovulation Calculator 2026 🌙 Dark Mode Estimate your ovulation date, fertile window, and next period using your cycle history — with multi-month predictions, a visual cycle wheel, symptom and BBT tracking, cycle history logging, and more, all calculated privately in your browser. ⚠️ Important: This calculator provides estimates only based on average cycle data. It is NOT a reliable method of contraception and should not be used to prevent pregnancy. Actual ovulation timing varies due to stress, health conditions, and individual physiology. Consult a healthcare provider for fertility or contraception guidance. Cycle Details First Day of Last Period (LMP) Average Cycle Length (days) ⓘ Luteal Phase Length (days) ⓘ Period Duration (days) Mode Trying to Conceive Trying to Avoid Pregnancy My cycles are irregular (show a wider range instead of one exact date) Auto-calculate cycle length from my logged history below Calculate Your Prediction Estimated Ov...