Run statistical tests, compute probabilities and turn data into charts — free tools for analysts, marketers and students.
Everything a student needs to stay on top of grades, deadlines and study time — free online calculators that run right in your browser with no registration.
Run your freelance business like a pro: generate professional invoices, price your time correctly, and understand taxes and fees — all with free tools.
A growing toolbox for developers: format, validate and convert code, build regex patterns, generate UUIDs and commit messages — fast, private and free.
Understand your body and plan your fitness journey with accurate, free calculators for BMI, daily calories, TDEE, body fat and hydration.
The A/B test calculator computes statistical significance and confidence from your conversion rates and sample sizes.
Enter favorable and total outcomes to get the probability, odds and percentage for single and combined events.
The confidence interval calculator estimates the range where the true population value lies from your sample mean, size and confidence level.
Yes. The bar chart, pie chart and histogram generators turn your numbers into shareable visualizations.