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Free Online Bend Deduction & Flat Length Calculator – Sheet Metal Bending Tool


Accurately calculate bend deduction and flat length for steel, aluminum, and stainless steel parts. Use our free online sheet metal bending calculator—fast, precise, and easy to use.

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Bend Deduction and Flat Length Calculator

Key Features:

  • 🔧 Supports steel, aluminum, and stainless steel
  • 📏 Inputs for material thickness, bend angle, and bend radius
  • 📐 Calculates bend deduction and flat length instantly
  • 💻 Clean, mobile-friendly user interface
  • ✅ No login or installation required

How to Use:

  1. Select material (steel, aluminum, or stainless steel)
  2. Enter material thickness in millimeters
  3. Input bend angle (from 1° to 180°)
  4. Enter inside bend radius
  5. Click “Calculate” to view results
  6. Read the bend deduction and total flat length needed

How It Works – Calculation Formula:

  • Bend Deduction is calculated using the formula: \text{Bend Deduction} = \frac{\pi \times \text{Thickness} \times \text{Angle}}{180}
  • Arc Length: \text{Arc Length} = 2 \times \pi \times \text{Radius} \times \left( \frac{\text{Angle}}{360} \right)
  • Flat Length = Arc Length + 2 × Bend Deduction

This gives a reliable estimate of how much flat sheet is required before bending to achieve the desired shape.

Frequently Asked Questions (FAQ):

Q1: What is bend deduction?

A: Bend deduction is the material length removed at the bend to account for compression and stretch during forming.

Q2: What materials are supported?

A: Steel, aluminum, and stainless steel. For others, contact us for customization.

Q3: Can I use it for U-channels or custom profiles?

A: This calculator is ideal for single bends. For complex profiles, use CAD software or advanced CNC tools.

Q4: Does this calculator use K-Factor?

A: No, it uses a simplified deduction formula. For K-factor-based calculations, use our advanced version.

Q5: Can I export the result?

A: Currently, results are displayed on screen. Export options are in development.

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