# Kerf Construction Calculator — Concrete, Stair, Roofing, Pipe

> Concrete, Stair, Roofing, Pipe (iPhone/iPad app by Koreniuk Oleksandr.)

- Source: https://appshunter.io/ios/app/kerf-construction-calculator/id6788179502 (this page in markdown: same URL + `.md`)
- Developer: [Koreniuk Oleksandr](https://appshunter.io/developer/1563057206)
- Category: Utilities
- Price: $9.99
- Age rating: 4+
- Requires: iOS 26.0 · 4 MB
- Languages: American English
- Released: 2026-07-15
- Data updated: 2026-08-10
- User reviews in markdown: https://appshunter.io/ios/app/kerf-construction-calculator/id6788179502/reviews.md

## What is Kerf Construction Calculator?

Kerf Calc is the construction field calculator that just works — offline, no account, no subscription. Buy it once.

FEET-INCH-FRACTION, DONE RIGHT
Punch dimensions the way you measure them: 8' 4-1/2" — add, subtract, multiply, divide, and read the exact result to your set fraction (1/8 to 1/64). Do real area and volume on the tape: 10' × 8' = 80 sq ft, × 4" = 26.67 cu ft.

EVERY TRADE, ONE APP
• Framing — rafters (actual cut: line + overhang − ½ ridge, plus hip/valley/jack), stairs to IRC/IBC code with live riser/tread/headroom checks, right-angle & pitch
• Concrete — slabs, footings, columns: yards, bags, ready-mix trucks, control joints, plus a waste allowance
• Rebar — ASTM A615 sizes, weights, slab-mat, laps
• Pipe — offsets (travel, run and the fitting multiplier at 45°, 22½°, 11¼° or any angle), rolling offsets, cut length from your own take-outs, and drainage grade in in/ft, percent, 1:N or degrees
• Materials — roofing squares, drywall, paint, block, brick, mortar, pavers, board feet, compound miter
• Convert — feet-inch ↔ decimal ↔ metric (NIST-exact)

ON YOUR WRIST
The Apple Watch app carries all 20 calculators. Turn the Digital Crown to set a dimension and the answer is already on screen — rafter cuts on a roof, grade in a trench, bag counts at the pour. Runs on its own, with no phone and no signal.

SHOWS ITS WORK
Every calculator shows the actual formula and the code or standard it cites (IRC, IPC/UPC, ASTM, NIST, ACI, NCMA, framing-square tables) — so you can trust the number, not just take it.

BUILT FOR THE JOB SITE
Sunlight-readable light design, glove-sized keys, works with zero signal. iPhone, iPad, Apple Watch, and Mac.

Not certified engineering — a field calculator. Verify against your locally adopted code.


## Version history (last 4 releases)

### 1.0.3 — 2026-08-08

SEARCH AND METADATA
Kerf Calc is now listed as a construction calculator, so the trades that need it can actually find it.

WHAT'S INSIDE, UNCHANGED
20 verified calculators — concrete, stairs to IRC/IBC, roofing squares, pipe offsets and grade, rebar,
aggregate, pavers, mortar, estimating and unit conversion. Every one shows its formula and the code or
standard it cites. Offline, no account, no subscription.

Also on Apple Watch: all 20 calculators, driven by the Digital Crown.

### 1.0.2 — 2026-07-30

NEW — APPLE WATCH

All 20 calculators on your wrist. Turn the Digital Crown, read the answer — no phone, no signal.

• Framing — rafter cut length, stairs to IRC/IBC, right angle
• Concrete — slabs, footings, rebar, aggregate, pavers
• Takeoff — area and volume
• Materials — roofing squares, drywall, compound miter, board feet, mortar
• Pipe — offset, rolling offset, cut length, grade
• Convert — feet-inch to metric

Every wrist screen leads with the answer and runs the same verified maths as the phone.

FIXED
• Dimensioned tape maths now keeps its units across an intermediate "=". Reading 10' × 8' = 80 sq ft and then continuing × 4" now gives cubic feet, not another area.

### 1.0.1 — 2026-07-26

NEW — PIPE LAYOUT
• Offset — set, travel, run and the fitting multiplier for 45°, 22½°, 11¼° or any angle
• Rolling Offset — true offset from set and roll, plus the angle to roll the fitting
• Cut Length — centre-to-centre less your own take-outs
• Grade — fall in inches per foot, percent, 1:N and degrees, checked against IPC/UPC minimums

Every one shows its formula and the standard it cites, like the rest of the app. Still offline, still buy-once.

### 1.0 — 2026-07-15

No release notes.

## More apps by Koreniuk Oleksandr

- [Skyscraper Frog](https://appshunter.io/ios/app/skyscraper-frog/id1563057204)
- [Golden Ratio Tech Calculator](https://appshunter.io/ios/app/golden-ratio-tech-calculator/id1570841203)
- [Golden Ratio Calculator Lite](https://appshunter.io/ios/app/golden-ratio-calculator-lite/id1570956847)
- [Indox Text](https://appshunter.io/ios/app/indox-text/id1603883417)
- [Typing Mill](https://appshunter.io/ios/app/typing-mill/id1631148042)
- [Big Pink Cat](https://appshunter.io/ios/app/big-pink-cat/id6497066161)

All apps by Koreniuk Oleksandr: https://appshunter.io/developer/1563057206

---

*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 2026-08-10.*