# Bend Allowance Calculator — Sheet Metal K-Factor Tool

> Sheet Metal K-Factor Tool (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/bend-allowance-calculator/id6760906742 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities
- Price: $0.99 (on sale, was $4.99)
- Age rating: 4+
- Requires: iOS 26.2 · 1 MB
- Languages: American English
- Released: 2026-03-23
- Data updated: 2026-08-29
- User reviews in markdown: https://appshunter.io/ios/app/bend-allowance-calculator/id6760906742/reviews.md

## What is Bend Allowance Calculator?

Setting up a press brake job and need the bend allowance, deduction, or flat blank length before you cut? Getting it wrong wastes material and time. This calculator computes BA, OSSB, BD, and flat blank from your K-factor, material thickness, bend radius, and angle.

Enter material thickness, inside bend radius, bend angle, and K-factor (or use presets for mild steel, aluminum, stainless). Get bend allowance, bend deduction, outside setback, and total flat blank length.

WHAT IT CALCULATES:
- Bend Allowance (BA)
- Bend Deduction (BD)
- Outside Setback (OSSB)
- Flat blank length for single and multi-bend parts
- Arc length of the neutral axis

K-FACTOR PRESETS:
- Air bend, bottom bend, coining
- Mild steel, aluminum, stainless steel
- Custom K-factor entry

KEY FEATURES:
- Multi-bend flat pattern layout
- Standard K-factor presets
- Metric and imperial units
- Works completely offline
- No account or login required

Built for sheet metal fabricators, press brake operators, and mechanical engineers.


## Version history (last 3 releases)

### 1.0.2 — 2026-06-27

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

[bending sheet metal calculator](https://appshunter.io/ios/topics/bending-sheet-metal-calculator)

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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 2026-08-29.*