# Wire Length of Extension Spring Calculator

Calculate wire length for extension springs with our easy-to-use online calculator. Get accurate, reliable results in no time!

An **Extension Spring**, also known as a **Tension Spring**, is composed of tightly wound helical coils. The two ends of the spring are attached with hooks or loops, allowing it to be connected to other components. When the components move in opposite directions, the spring pushes them back together. The **Wire Length** of an Extension Spring is the length of the spring when it is not under tension, measured between the inner surfaces. A convenient online calculator is available to help calculate the Wire Length of an Extension Spring.

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Wire Length of Extension Spring = Π x D x (N+2)

Where:

- D = Mean Diameter
- N = Total Coils