JACK Toolkit — built on site, for site.
Free calculators for apprentices, tradies, and site supervisors. No login, no ads, no signup — just open and use. Built because the AI hype keeps missing the actual people on the tools.
Diagonal
Square up any rectangle. 3-4-5 method, custom dimensions, instant diagonal check.
Tile Setout
Plan tile layout, grout joints, and cut sizes before you start. Avoid slivers.
Tile & Grout Colour
Preview tile and grout colour combinations before you commit. Built for tilers and designers.
Roof Calculator
Pitch, rafter length, roof area, and material estimates from plan dimensions.
Material Calculator
Estimate bricks, blocks, mortar, sand, and cement for any wall size.
Falls & Ratios
Calculate falls and gradients to Australian standards. Ratio, percent, or degrees.
RL / AHD Heights
Build a level & datum schedule. Reduced levels referenced to AHD.
Point Cloud Builder
Turn spot levels into a 3D topo surface. Contours, grid mesh, DXF and CSV export.
These tools are free and stay free — for tradies, apprentices, site supervisors, designers, and architects. Built for the people who measure twice on a job, and for the ones working things out on the desk before they ever hit site. If something here saves you time, the best thing you can do is share it with someone else who'd use it. Found a bug or want a tool that doesn't exist yet? Email me or DM on Instagram.