For the workshop, not the classroom

Your phone’s calculator doesn’t know what a dovetail is. This one does.

Thirteen calculators built for real woodworkers. Fractions, joinery, wood movement — no decimal conversions, no subscription, no internet required.

Download Free See what’s inside

Free to download
Works offline
iCloud sync

13 calculators 30 wood species iPhone, iPad, Watch Zero decimal math

Miter Angles

Six sides? Octagon? Set the polygon, get the cut.

Dial in the number of sides, see the miter angle and bevel instantly. Dead On draws the polygon so you can eyeball the result before committing it to stock.

Any regular polygon, 3 to 24 sides
Compound miter for sloped staves
Animated diagrams with dimension overlays

Dead On miter calculator showing a six-sided polygon with 60 degree cut angle

Board Feet

Know the lumber bill before you load the truck.

Stack boards, get a running total with cost. Perfect for a yard run when the sawyer’s waiting and you’re doing math on a scrap of cardboard.

Board feet calculator with multiple boards and running total

Mortise & Tenon

Joinery math with the joint drawn in front of you.

Enter stock thickness. Dead On works out the tenon proportions using the one‑third rule — and renders the mortise so you know what you’re chopping.

Mortise and tenon calculator with joint diagram

Wood Movement

Account for the season before the season ruins the joint.

Thirty species with real tangential and radial movement data. Tell Dead On where the piece will live — summer humid, winter dry — and it tells you how far a tabletop will move.

30 species, verified shrinkage coefficients
Summer and winter EMC presets by region
Flatsawn, quartersawn, and riftsawn grain orientations

Browse all 30 species →

Wood movement calculator showing red oak seasonal expansion

Everywhere you work

Your calculations follow you from bench to bandsaw to breakfast table.

Projects sync across iPhone and iPad with iCloud. Last calculation shows on your Apple Watch. The Home Screen widget keeps the number at a glance.

iPhone iPad Apple Watch Home Screen Widget Dynamic Island

Dead On projects view in dark mode with beaver mascot

Pricing

Free to try. $4.99 to go Pro.

Download free and start with the fraction and board feet calculators. A single $4.99 unlock opens every joinery calculator, all 30 wood species, project saving, and iCloud sync on every device signed into your Apple ID. No subscription. No ads. One Pro unlock, keep it forever.

13 calculators with visual diagrams
30 wood species for movement & weight math
Save unlimited projects, synced via iCloud
iPhone, iPad, and Apple Watch companion
Works fully offline, everywhere

Download Free Questions? Support

Dead On beaver mascot in a confident pose