How accurate are these calculations?

Formulas adhere strictly to industry engineering and trade handbook standards. Always allow safety margins for critical real-world installations.

Does this tool transmit any personal or project data?

No. All calculations run strictly client-side inside your browser. No data ever leaves your computer.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

Coil Spring Rate & Compression Stiffness Calculator

Calculate helical compression spring rate (lbs/in), mean coil diameter, spring index C, and solid height based on wire gauge and active coil turns.

100% free
Private in browser
No signup
No watermarks

Wire Diameter d (Inches)

Outer Spring Diameter OD (Inches)

Number of Active Coils Na

Torsional Shear Modulus G (PSI, e.g. 11.5M for spring steel)

Spring Rate k (lbs/in)

131

Mean Diameter D (Inches)

1.75

Spring Index C (D / d)

Compressed Solid Height (Inches)

2.5

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About Coil Spring Rate & Compression Stiffness Calculator

Calculate helical compression spring rate (lbs/in), mean coil diameter, spring index C, and solid height based on wire gauge and active coil turns. You get Spring Rate k, Mean Diameter D and Spring Index C straight away. Everything runs in your browser, so your data never leaves your device.

How to use Coil Spring Rate & Compression Stiffness Calculator

Enter your specific project and environment input parameters
Review the computed values, conversions, and ratings in real-time
Adjust variables to simulate different scenarios and tolerances

Key features

Instant dynamic client-side calculations
Interactive sliders and numeric inputs
Industrial and engineering formulas validated against standards
100% private and offline in-browser execution

Frequently asked questions

How accurate are these calculations?: Formulas adhere strictly to industry engineering and trade handbook standards. Always allow safety margins for critical real-world installations.
Does this tool transmit any personal or project data?: No. All calculations run strictly client-side inside your browser. No data ever leaves your computer.
What does the Coil Spring Rate & Compression Stiffness Calculator give me?: It works out Spring Rate k, Mean Diameter D, Spring Index C and Compressed Solid Height, updating live as you change the inputs.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

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