Trim Mark Offset Planner

Calculates finished book spine thickness in mm or inches from page count, paper caliper, and cover board weight.

Predicts total book block depth from sheet count, paper bulk factor, and swell allowance.

Computes the maximum readable spine text width from final spine thickness.

Works out case board dimensions from trim size, overhang, and hinge allowances.

Estimates cloth or paper wrap area needed for a given case size and turn-in width.

Computes flap width and fold positions from trim size and jacket coverage goals.

Places spine score lines and fold marks from trim, bleed, and board thickness inputs.

Calculates endpaper sheet size from trim size, trimming allowance, and guard margin.