# Sixteenth: Construction Math — Feet-inch fraction calculator

> Feet-inch fraction calculator (iPhone/iPad app by Duong Nguyen.)

- Source: https://appshunter.io/ios/app/sixteenth-construction-math/id6822211221 (this page in markdown: same URL + `.md`)
- Developer: [Duong Nguyen](https://appshunter.io/developer/1035251419)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 35 MB
- Languages: American English
- Released: 2026-11-05
- Data updated: 2026-11-11

## What is Sixteenth?

Sixteenth is a construction calculator that works in feet, inches and fractions, the way you read a tape. Type 12' 3-5/8" + 4' 7-1/4" and get 16' 10-7/8", rounded to the sixteenth or whatever precision you set.

THE CALCULATOR • Feet, inches, yards and fractions from 1/2 to 1/64, plus metric • Square and cubic entry: tap ft twice for ft², three times for ft³ • Pitch, rise, run and diagonal keys to solve any right triangle • Percent, memory (M+, M−, MR), repeat equals, trig, square root and π • A tape of every calculation. Edit any line, reuse a result, save named memories

TRADE TOOLS (20+) • Stairs: risers, treads, stringer length, framing square settings, marks along the stringer, headroom and IRC checks • Rafters: common, hip/valley and jacks, plumb and seat cuts, birdsmouth with heel and HAP • Wall studs with layout marks you can read straight off the tape • Rake walls, roofing squares and shingle bundles • Right triangle and pitch, arcs and circles, polygons • Concrete slabs, footings and tubes in cubic yards and premix bags • Rebar grids, board feet and material weight • Drywall and sheathing with tape, mud and screws • Decks, fences, paint, flooring and tile • Compound miter and crown molding saw settings

CUT LIST Enter the pieces you need and the lengths your yard sells. Sixteenth finds the fewest boards to buy and maps every cut on every board, kerf included.

JOBS AND QUOTES Save results to a job and Sixteenth builds the material list for you. Add unit prices and sales tax for a total, then send the job as a clean PDF or as text to your client or supplier.

BUILT FOR THE JOB SITE • Glove mode with bigger keys • Sunlight mode for reading outdoors, plus dark theme • Voice input: say "twelve feet three and five eighths plus four feet seven" • Works offline. No account, no ads • English and Spanish

SIXTEENTH PRO The calculator, all the tools, voice input and the tape are free. Sixteenth Pro is a one-time purchase, not a subscription, and adds: • Unlimited jobs • Prices, sales tax and totals • Unlimited PDF and text exports • Saving cut lists to jobs

Always double-check critical dimensions and follow your local building code.

Questions or a tool you'd like to see? support@yobimi.com

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Sixteenth Pro | $9.99 | one-time |


## Is Sixteenth safe?

Not enough ratings yet to assess Sixteenth.

## Is Sixteenth legit?

Sixteenth: Construction Math appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Sixteenth is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.0.3 — 2026-11-09

Fixes a crash when a result grew too large (for example after pressing = many times). Very large results now show "Number is too large".

### 1.0.0 — 2026-11-05

No release notes.

## More apps by Duong Nguyen

- [Learn English by Conversation](https://appshunter.io/ios/app/learn-english-by-conversation/id1035251420)
- [Audiobooks from LibriVox](https://appshunter.io/ios/app/audiobooks-from-librivox/id1228520357)
- [English Pronunciation Practice](https://appshunter.io/ios/app/english-pronunciation-practice/id1289590188)
- [Learn English Speaking - VOA](https://appshunter.io/ios/app/learn-english-speaking-voa/id1293645178)
- [SearchWord: Find Word & Quotes](https://appshunter.io/ios/app/searchword-find-word-and-quotes/id1367366634)
- [Gutenberg Ebook Reader](https://appshunter.io/ios/app/gutenberg-ebook-reader/id1444499980)

All apps by Duong Nguyen: https://appshunter.io/developer/1035251419

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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 2026-11-11.*