Shelf Deflection Checker

lshondamizutand2app

About this app

See how far your shelf will sag before you cut it. Pick a wood, enter the span, and watch the loaded shelf bend on screen with a clear pass or fail.

Shelf Deflection Checker is a woodworking calculator for furniture makers, cabinet builders and anyone putting up bookshelves. Instead of guessing whether a board is thick enough, you get the sag in numbers and a drawing of the shelf bowing under its load.

HOW IT WORKS
- Pick a material from an editable table of hardwoods, softwoods, plywood, particleboard, MDF, glass and steel.
- Enter span, depth and thickness in mm or inches.
- Choose how the shelf is held: resting on pins, fixed ends or cantilever.
- Load it with a books-per-length preset or a single weight.
- Classic beam formulas give the sag and the sag per length, checked against an editable visibility threshold.
- A long-term creep factor covers books that stay on the shelf for months.

STIFFEN IT
Add an edge nosing or apron and see the composite section stiffen the board. The checker treats board and stiffener together, so you can see how much a strip of hardwood along the front really helps.

SOLVE FOR THE ANSWER
Let the app find the longest span or the thinnest board that still passes, so you can plan the cut list before you touch the saw.

FEATURES
- Sag check for shelves resting on pins, fixed ends or cantilevers
- Editable material table: hardwoods, softwoods, sheet goods, glass and steel
- Book-load presets, single weights, shelf self-weight and long-term creep
- Edge nosing and apron stiffeners calculated as a composite section
- Max span and min thickness solvers, mm or inches, fully offline

Five simple tabs: Shelf, Materials, Stiffener, Max span and Notes.

Fully offline: no internet needed, no ads, no sound, no accounts. Just open it and check your shelf.

What’s new

Shelf Deflection Checker