Free calculators, generators and practical tools

Each tool solves one practical problem properly and gives you something you can use: a full-size template to print, a file for CAD or a cutter, or a calculation with every step shown. No sign-up, no install. Everything runs on your device.

Sheet metal & fabrication

Cone flat pattern calculator

Flat pattern for cones, truncated cones and reducers, with a full-size printable template.

Full-size PDF template
DXF
SVG
Mark-out table

Mixing & blending

Pearson square calculator

Mix two ingredients to hit a target percentage, with the square and the working shown.

Amounts & ratio
Pearson square diagram
Worked calculation
Batch cost

How these tools are built

Private by designCalculations run in your browser. Nothing you type is uploaded.
Checked, not guessedEvery formula is tested against independent reference calculations and published worked examples.
Output you can usePrintable templates at true scale, CAD-ready files, and the working behind every number.