# Rebar Splice Length Calc — ACI 318 Development Length

> ACI 318 Development Length (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/rebar-splice-length-calc/id6760927176 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities
- Price: $4.99
- Age rating: 4+
- Requires: iOS 26.2 · 1 MB
- Languages: American English
- Released: 2026-03-23
- Data updated: 2026-08-20
- User reviews in markdown: https://appshunter.io/ios/app/rebar-splice-length-calc/id6760927176/reviews.md

## What is Rebar Splice Length Calc?

On a concrete pour and need a lap splice length for epoxy-coated rebar? Pick the bar, type the concrete strength and cover, and read the development length and lap splice off one screen. Everything updates as you type.

WHAT IT CALCULATES:
- Bar diameter (db) for the selected bar
- Tension development length (ld), using the ACI 318-19 Section 25.4 method
- Lap splice length, as your selected class factor times ld (Class A = 1.0, Class B = 1.3)

WHAT YOU ENTER:
- Bar size: #3 through #11, plus #14 and #18 (metric #10 through #57)
- Concrete strength f'c, and steel yield fy
- Cover distance
- Coating: uncoated or epoxy-coated
- Concrete: normal weight or lightweight
- Bar position: top bar or other
- Splice class: A or B

The factors behind the number:
- Coating factor for epoxy-coated bar
- Bar size factor
- Lightweight concrete factor
- Top-bar position factor
- The combined top-bar and coating factors are capped at 1.7, as the code requires

SUPPORTED:
- Imperial (psi, inches) and Metric (MPa, mm), with your choice remembered between launches
- Instant results as you change any input

READ THIS BEFORE YOU RELY ON IT:

This is a fast preliminary estimate, not a substitute for a full code check or your EOR's stamp.

- It assumes the confinement term (cb + Ktr)/db = 1.5. It does not ask for bar spacing or transverse reinforcement, so it cannot take credit for tighter confinement, and it does not apply the ACI Grade 80/100 factor. Size it for Grade 60 bar and verify anything higher by hand.
- It returns the lap splice for the one class you select, not both at once.
- It does not do hooked or headed bar development, compression splices, or bundled bars.

KEY FEATURES:
- One screen, no menus, no setup
- The calculator works completely offline. No account, no login, nothing you type leaves your device
- $4.99 once. No subscription, no in-app purchases

The app also includes a More Pro Tools card linking to our other apps on the App Store. Nothing in the calculator needs it, and nothing needs a connection.

Built for structural engineers, concrete contractors, and building inspectors who want the number in seconds and know when to check it.

## Chart rankings

- #175 in Top Paid · Utilities (US App Store)


## Version history (last 5 releases)

### 1.0.4 — 2026-07-18

More Pro Tools now leads with FE Civil Exam Prep — NCEES-style practice questions and a full-length timed mock exam for the FE Civil exam. Everything in this app works exactly as before.

### 1.0.3 — 2026-07-18

More Pro Tools now leads with FE Civil Exam Prep — NCEES-style practice questions and a full-length timed mock exam for the FE Civil exam. Everything in this app works exactly as before.

### 1.0.2 — 2026-06-28

Added a More Pro Tools section to discover related field calculators.

### 1.0.1 — 2026-04-14

Bug fixes and performance improvements.

### 1.0 — 2026-03-23

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

## Related topics

[rebary](https://appshunter.io/ios/topics/rebary)

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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 2026-08-20.*