Woodworking Calculator Dead On
Board Foot, Fraction & Lumber
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
The only calculator app with dovetail spacing, box joints, and wood movement. Fractions are native. No subscription.
Dead On is the woodworking calculator that thinks like a woodworker.
FRACTION CALCULATOR
Mixed fractions are first-class. Type 5-3/4 + 2-1/8 and get an instant answer in fractions — chain math with parentheses, down to 1/32. No decimal conversion, ever.
VOICE INPUT
Hands full of sawdust? Tap the mic and say "five and three quarters plus two and an eighth." Dead On writes 5-3/4 + 2-1/8.
SHOP MODE
Step-by-step cut guidance in giant shop-floor type. It reads each step and listens for "next" — eyes on the blade, not the phone.
18 TOOLS BUILT FOR THE SHOP
• Board feet with cost — know the bill before the register
• Lumber yield with waste factor
• Cut list optimizer and glue-up panels
• Miter and compound angles with live diagrams
• Dovetails, box joints, dados, mortise & tenon
• Shelf sag, drawer slides, pilot holes, taper, epoxy pour, wood weight, wood EMC
JOINERY WITH LAYOUT MARKS
The only woodworking app with built-in joinery math — and the diagrams are drawn from your numbers, with layout marks you can transfer straight to the board.
WOOD MOVEMENT
Select from 30 wood species and calculate seasonal dimensional change from USDA data. Know exactly how much your tabletop will move, and how much gap to leave.
PROJECT ORGANIZATION
Save calculations to projects. Your blanket chest keeps its board feet, dovetail spacing, and wood movement in one place — with seasonal movement reminders and iCloud sync.
BUILT FOR WOODWORKERS
• Fraction-native input and display
• Imperial and metric support
• 30-species North American wood database
• Apple Watch companion with a Digital Crown running total
• No subscription — pay once, own it forever
• No ads, no account required, and nothing sold to data brokers
Measure twice. Calculate once.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The biggest update since launch: 18 tools, an Apple Watch app, and voice input.
NEW CALCULATORS
• Cut List Optimizer — lay your cuts out across boards or sheet goods and see the waste before you make it
• Lumber Yield — what you actually get out of rough stock
• Wood EMC — equilibrium moisture content from temperature and humidity
• Pilot Holes — bit sizes by screw gauge and species
• Epoxy Pour — volume and mix for river tables and voids
NEW
• Apple Watch app with a Digital Crown adder for running totals at the bench
• Voice input — say a measurement instead of typing it
• Shop Mode — big targets and haptics for when your hands are full
• Projects now open your saved calculations back up where you left them
• Help on every calculator, with worked examples
FIXED
• Dovetail diagrams label the flank slope correctly — it no longer reports the tail-to-pin ratio as though it were the slope
• Cut List respects the number of boards you actually have on hand, and tells you when a plan needs more
• Prices enter correctly in regions that write 12,50 instead of 12.50
• Result numbers and verdict banners are readable in Light Mode
• Shop Mode asks for microphone permission instead of silently hearing nothing
• The first Quick Save goes to a real project, not the read-only sample
• Settings → Rate Dead On opens the right App Store page
Pro is still a one-time purchase. If you already bought Pro, you keep it — there is nothing to do.
The developer, Chad Berry, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Cognfy LLC
- Size
- 23 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Dead On Pro $9.99
- Dead On Pro $4.99
- Copyright
- © 2026 Cognfy LLC
