# KerfCalc – Woodworking Math — Board feet, cut lists, kerf

> Board feet, cut lists, kerf (iPhone/iPad app by Deakyu Lee.)

- Source: https://appshunter.io/ios/app/kerfcalc-woodworking-math/id6797046477 (this page in markdown: same URL + `.md`)
- Developer: [Deakyu Lee](https://appshunter.io/developer/6780601722)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 30 MB
- Languages: American English
- Released: 2026-08-18
- Data updated: 2026-08-21
- User reviews in markdown: https://appshunter.io/ios/app/kerfcalc-woodworking-math/id6797046477/reviews.md

## What is KerfCalc?

KerfCalc is a set of woodworking calculators for the weekend workshop. Clean, fast, and built for the way woodworkers actually measure: in fractions.

No ads. No accounts. No subscription. Works with no signal at all.


BUILT FOR FRACTIONS

Type 1-3/4 the way you'd say it. A custom keypad puts the fraction keys where your thumb already is, with shortcuts for the sixteenths and eighths you use constantly. Every calculation stays exact — no decimal drift, no 0.749999 where 3/4 belongs.

Switch the whole app to millimetres whenever you want, and it remembers.

FREE TOOLS

• Converter — fractions, decimals and millimetres, three ways
• Board feet — with a running tally and a cost estimate at your price per board foot
• Shelf spacing — even divider positions, marked from one end so errors can't accumulate
• Screws & pilot holes — the pilot and countersink size for every screw gauge, by wood hardness

UNLOCK EVERYTHING — ONE PAYMENT

• Cut list optimizer — for boards and for sheet goods. Counts the blade.
• Saved cut lists — name a job and come back to it
• Board inventory — what's actually in your rack, with total board feet
• Stain & finish — how much to buy, coats and waste buffer included
• Joinery reference — dovetail slopes with angles, box joints, proportion rules
• Golden ratio — harmonious proportions from a single dimension

IT COUNTS THE KERF

Four 24-inch pieces from a 96-inch board sounds like it fits. It doesn't — three cuts at 1/8" each eat 3/8", and the fourth piece comes up short. KerfCalc plans around the blade, for boards and for full sheets, and shows you the layout.

IT KNOWS A 2x4 ISN'T 2x4

Tap a nominal size and you get the real one: 1-1/2 x 3-1/2. Getting that wrong is the fastest way to build a carcass an inch off.

HONEST NUMBERS

When a value can't be marked on a tape, KerfCalc says so rather than pretending. When there are two right answers —what the lumberyard charges versus what you can actually cut — it gives you both.

Everything stays on your device. Nothing is collected, and nothing is sent anywhere.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| KerfCalc Unlock | $4.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-18

No release notes.

## More apps by Deakyu Lee

- [BeDinodex](https://appshunter.io/ios/app/bedinodex/id6780601720)
- [ChromaKit - Color Picker](https://appshunter.io/ios/app/chromakit-color-picker/id6793312921)

All apps by Deakyu Lee: https://appshunter.io/developer/6780601722

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-21.*