5 Best Free Online Bend Allowance Calculator Websites

Here is a list of best free online bend allowance calculator websites. Bend Allowance is a concept used in metal works and metal fabrication that indicates the length of the neutral axis between the arc length of the bend. When sheet metal is bent, the material on the inside gets compressed while the outside material gets stretched. Additional material is added to ensure that the bent metal part has the correct dimensions. Calculating the required supplementary material is known as bend allowance calculation. If you want to find out the bend allowance for a metal sheet, then check out these online bend allowance calculator websites.

Through these websites, users can quickly calculate the band allowance using bend angle, inside radius, material thickness, and k-factor values. Some of these websites can also consider the material type and material thickness to perform the band allowance calculation. Using the same set of input parameters, some of these websites can also calculate the bend deduction value. To help new users, I have included the necessary calculation steps in the description of each website.

Some of these calculators can also generate 2D and 3D representations of bent metal based on the input parameters. Plus, a good set of additional online tools and calculators are also provided by these calculators like Angle of Twist Calculator, Density Calculator, Clamping Force Calculator, etc. Go through the list to know more about these websites.

My Favorite Online Bend Allowance Calculator Website:

omnicalculator.com is my favorite website as it can calculate both bend allowance and bend deduction using the set of input parameters. Plus, it explains bend allowance and shows the bend allowance calculation formula.

You can also check out lists of best free Online Rooftop Solar Installation Calculator, Online Guitar String Tension Calculator, and Online Render Time Calculator websites.

Comparison Table:

Features/Website Names	Can also calculate bend deductions	Considers material type in the calculation	Shows bend allowance calculation formula
omnicalculator.com	✓	x	✓
custompartnet.com	✓	x	x
machinemfg.com	x	x	✓
sendcutsend.com	✓	✓	x
trimech.com	x	✓	x

omnicalculator.com

omnicalculator.com is a free online bend allowance calculator website. Through this website, users can calculate the length of sheet metal bend. Apart from bend allowance, it can also be used to calculate the bend deduction of a metal sheet. To perform the calculation, it uses bend angle, inside radius, metal thickness, and K-factor (neutral axis position) values. Before starting the calculation process, users can specify the SI units of input parameters.

This website also explains the concept of bend allowance and shows the formula that it uses to perform bend allowance. Now, follow the below steps.

How to perform bend allowance calculator online using omnicalculator.com:

Go to this website and access the Bend allowance calculator.
After that, enter the Bend Angle, Inside Radius, Material Thickness, and K-factor values.
Now, specify the bend angle unit (degrees and radians). Similarly, choose a unit for radius and material thickness parameters from available ones like mm, cm, m, in, etc.
Next, view the calculated bend allowance and bend deduction values.

Additional Features:

This website also offers similar online calculators such as Angle of Repose, Angle of Twist, Density, Copper Wire Weight, etc.

Final Thoughts:

It is one of the best free bend allowance calculator websites that can calculate both bend allowance and bend deduction values of a metal sheet.

Pros	Cons
Can calculate both bend allowance and bend deductions
Explains bend allowance with calculation formula

Home Page

custompartnet.com

custompartnet.com is another free online bend allowance calculator website. Through this website, users can calculate the bend allowance using the known Sheet thickness (in), Bend Radius (in), Bend Angle (degrees), and K-factor values. By using the same set of input values, it also calculates Setback (in) and Bend Deductions (in) values. It also explains bend allowance and shows a diagram of a bend sheet metal with all necessary markings. Although, it doesn’t show the formula to calculate the bend allowance. Now, follow the below steps.

How to calculate bend allowance online using custompartnet.com:

Go to this website and access the bend allowance calculator.
After that, enter the sheet thickness, bend radius, bend angle, and K-factor values.
Now, view the calculated bend allowance value in cinches. It also shows the setback and bend deduction values.

Additional Features:

This website also offers additional tools such as clamping force calculator, cooling time calculator, turning horsepower calculator, wipe bending force calculator, etc.

Final Thoughts:

It is another good online bend allowance calculator website that offers all the tools to quickly calculate the bending allowance and bending deduction values.

Pros	Cons
Can calculate bend allowance, bend deductions, and setback values
Explains bend allowance

Home Page

machinemfg.com

machinemfg.com is another free online bend allowance calculator website. This website not only calculates the bend allowance but also explains bend allowance in detail. It also offers bend allowance charts for steel, aluminum, and copper metals. It also shows the bend allowance formula that it uses to find out the bend allowance of a metal sheet. To perform the bend allowance, users need to submit the values of material thickness, inside radius, k-factor, and bending angle parameters. However, it doesn’t allow users to manually specify the units of input parameters. Now, follow the below steps.

How to calculate bending allowance online using machinemfg.com:

Launch this website and access its Bend Allowance Calculator.
After that, submit material thickness, inside radius, k-factor, and bending angle values.
Next, let this calculator perform the calculation.
Finally, view the calculated bending allowance value.

Additional Features:

This website also offers calculation tools and information related to Laser Cutting, laser Welding, Mechanical, Grooving, Metals, etc., fields.

Final Thoughts:

It is another good online bend allowance calculator website through which users can calculate the bend allowance value of a metal sheet.

Pros	Cons
Shows bend allowance calculation formula
Provides bend allowance charts for steel, aluminum, and copper metals

Home Page

sendcutsend.com

sendcutsend.com is another free online bend allowance calculator website. Through this website, users can calculate the bending allowance for different metal types (Aluminum, Chromoly, Mild Steel, etc. )and metal thickness (.25, .50, .63, etc.). It also considers the base length and flang parameters (position, outer length, angle, and direction) to calculate the bend allowance. This tool can also calculate the bend deductions using the same set of input parameters. Based on the calculated bend allowance and bend deduction values, it is a 2D sketch and 3D diagram of the bend metal. Now, follow the below steps.

How to calculate bend allowance online using sendcutsend.com:

Visit this website using the given link.
After that, access the bending calculator.
Next, specify material and thickness values.
Now, specify the base length and flang details.
Finally, view the calculated bending allowance and bending deduction values.

Additional Features:

This website offers multiple online services like Laser Cutting, CNC Routing, Waterjet Cutting, Bending and forming, Power Coating, etc.

Final Thoughts:

It is another good online bend allowance calculator website that also generates a 2D & 3D representation of the bend metal.

Pros	Cons
Can also calculate bending deductions
Generates 2D & 3D representations of a bent metal

Home Page

trimech.com

trimech.com is yet another free online bend allowance calculator website. This website can consider the material in its bend allowance calculation. Some of the materials that it supports are Aluminium, Steel, Stainless Steel, Copper, Brass, Titanium, etc. Besides this, it also requires thickness, inside bend radius, and bend angle values to calculate the bend allowance. Although, it doesn’t let users adjust the SI units of input parameters. Now, follow the below steps.

How to calculate bend allowance online using trimech.com:

Visit this website and access the Bend Allowance Calculator.
After that, choose a material from the material menu.
Next, specify the thickness (in), inside bend radius (in), and bend angle (degrees) values.
Finally, click on the Calculate button to view the bend allowance value in inches.

Additional Features:

This website offers multiple online services like Business Automation, Design, Documentation, Electrical, DOD, 3D Printing, etc.

Final Thoughts:

It is a simple and effective online bend allowance calculator website that considers the material type in the calculation.

Pros	Cons
Considers material type in the calculation

Home Page

Frequently Asked Questions

How do you calculate bending allowance?

To calculate the bending allowance for a sheet metal part, you can use the following formula: Bending Allowance (BA) = [(π/180) × Bend Angle] × (Inside Radius + K × Material Thickness). You can also check out the above mentioned bend allowance calculator websites to quickly find out the bend allowance value.

What is the formula for bend allowance for steel?

The formula for calculating the bend allowance for steel, or any other material, is the same as the general formula mentioned earlier: Bending Allowance (BA) = [(π/180) × Bend Angle] × (Inside Radius + K × Material Thickness)

Why do we calculate bend allowance?

he primary purpose of calculating the bend allowance is to ensure that the finished metal part has the correct dimensions and shape after the bending process. Bending stretches the outer surface of the material and compresses the inner surface, affecting the overall dimensions of the part. By calculating the bend allowance, you can account for this deformation and make sure the final part meets the design specifications.

What is the K factor of bend?

The K factor, also known as the neutral axis factor or simply "K," is a constant used in sheet metal bending calculations to account for the stretching and compressing of material during the bending process. It is a critical parameter for accurately determining the bend allowance or bend deduction. The K factor takes into account the material's behavior, the bend radius, and the material thickness.

What is the K factor for 90 degree bend?

The K factor, or neutral axis factor, for a 90-degree bend is typically 0.5. In sheet metal bending calculations, this value is often used as a general approximation for a 90-degree bend, especially when using air bending techniques. However, it's important to note that the actual K factor can vary depending on factors such as the material being bent, the bend radius, and the specific bending method used.

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