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Sheet Metal Bend Allowance Calculator — Free Online Tool

K-factor, BA, BD — flat pattern length

Calculate bend allowance, bend deduction, flat pattern length. With K-factor, material thickness, bend angle, inner radius.

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Sheet Metal Bend Allowance Calculator

Calculate bend allowance, bend deduction, K-factor adjusted neutral axis, flat pattern length. Essential for sheet metal CAD layouts and laser-cut prep.

How to use this tool

  1. 1

    Material + thickness

    Determines K-factor.

  2. 2

    Bend angle + radius

    Inner radius + bend angle.

  3. 3

    See BA + flat pattern

    Bend allowance + flat layout length.

Frequently Asked Questions

What is K-factor?
Ratio of distance from inner surface to neutral axis vs material thickness. Material- and process-dependent. Aluminum soft: 0.33-0.40. Steel: 0.40-0.45. Stainless: 0.45-0.50.
Bend allowance vs bend deduction?
BA = arc length along neutral axis. BD = how much material to subtract from leg-sum to get flat pattern. Both methods give the same flat length, just different formulas.
Inner radius minimum?
Rule: minimum inner radius = thickness for soft materials, 1.5-2× thickness for hard. Below minimum = cracking. Stainless 304: typically 1.5×T minimum.

Key Takeaways

  • Sheet Metal Bend Allowance Calculator is a free, browser-based calculator tool — k-factor, ba, bd — flat pattern length.
  • No signup, no downloads, no file uploads — your data stays on your device.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use Sheet Metal Bend Allowance Calculator

  1. Open the tool: Launch Sheet Metal Bend Allowance Calculator on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

Sheet Metal Bend Allowance Calculator — Quick Facts

Price
Free — no limits, no watermarks, no paywalls
Privacy
100% browser-based — no data is sent to any server
Platform
Any modern browser on desktop, tablet, or mobile
Category
Calculator Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
FeatureDetails
ToolSheet Metal Bend Allowance Calculator
CategoryCalculator
Signup RequiredNo
File UploadNone — processed in browser
Mobile SupportFully responsive
CostFree forever

Why Use Sheet Metal Bend Allowance Calculator?

You should try Sheet Metal Bend Allowance Calculator for a quick, private way to k-factor, ba, bd — flat pattern length. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.