### Extension Spring Force Formula and Calculator

This calculator will determine the spring rate related to an extension spring from basic geometry and material data input. Default units are shown in inches, etc however SI (metric) can be used.

This calculator will calculate any of the values remaining by changing one of the variables then selecting the "calculate: button for the selected variable.

Equation: *T _{F} = I_{T} + (D x k) *

Where:

T_{F} = Total Force exerted on spring

D_{ }= Distance spring is deflected

I_{T}= Initial tension force on spring

k = Spring constant determined by experiment or calculation

(*This calculator requires a java - enabled browser*)

**Open Extension Spring Force Formula and Calculator**

About Extension Spring Design:

Most extension springs are wound with an initial tension. This tension is the force that holds the spring coils wound together. The spring rate tends to be constant over the central 60 percent of the deflection range. When designing for a particular spring, design for critical loads and rates to be within the central 60% deflection and load range. Standard and custom springs are available. Exceeding manufactures maximum deflection almost always reduces usable spring life cycles.

Related

- Spring Terminology and Definitions
- Belleville Spring Washer Equation and Calculator
- Spring Types and Materials Review
- Morrison's Spring Tables Design Reference
- Rectangular Section Bar Steel Springs
- Leaf Spring Design and Engineering Strength of Materials
- Constant Force Spring Design and Equations
- Coil Spring Engineering Design Application
- Helical Compression Spring Critical Frequency Critical Frequency Formula and Calculator
- Compression Spring Assembly Operating Life and Reliability Equations and Calculator