Practical layout math, made visible

Plan the spacing.
See every mark.

Clear DIY calculators that show the formula, draw the layout, and give you a printable measurement list—before you make the first cut.

Built for the jobsite

Results you can check, not black-box answers

Every finished tool pairs precise calculations with a scaled diagram, explicit assumptions, and mark-by-mark positions.

See how material width, margins, count, and spacing produce the result.

Touch-friendly controls and readable plans work at the wall or workbench.

Take inputs, results, diagrams, assumptions, and position lists to the project.

Calculator library

Equalize open gaps or centerlines and get every batten position.

Arrange mixed frame sizes and get exact centers and hook positions.

Set a maximum gap or picket count and get every picket position.

Estimate stock boards, rows, seams, waste, joists, and fasteners.

Convert roof measurements into pitch, angle, slope, and rafter length.

Compare prescriptive joist sizes and spacing for a required clear span.