Topic collections

Browse collections

• Random & lotteries
  Random picker, weighted draws, dice tools, and probability calculators.
• Probability & simulation
  Simulators and probability calculators: trees, combinatorics, and distributions.
• Statistics (inference & tests)
  Confidence intervals, hypothesis tests, regression, and uncertainty.
• Data visualization
  Quick charts, histograms, box plots, and regression.
• Dev & data
  JSON formatter, UUIDs, subnet/CIDR, random CSV test data, and text tools.
• Paper & templates
  Printable paper templates: graph paper, notes, worksheets, and planners.
• PDF tools
  Compress, merge, split, and convert PDFs in your browser.
• Loans & mortgages
  Payments, schedules, affordability, and interest.
• Taxes
  VAT/GST, net↔gross, and quick tax math.
• Paint & coatings
  Coverage, area, cost, and DFT/WFT calculators.
• Date & time
  Days between dates, business days, and time zones.
• Geometry & graph
  Triangles, vectors, 2D/3D geometry, and graph tools.
• Study & classroom
  Worksheets, graph paper, GPA, and learning helpers.
• Unit conversion
  Unit converter, temperature, length, currency, and base conversion.
• Health & fitness
  BMI, body fat, calories, and heart rate zones.

Tip: If you can’t find what you need, use site search or browse the tools directory.