A calculator to find the spring rate (in lb/in), maximum travel (mm), force at bottom-out and material stress (MPa) of an unindentified spring.

Enter wire diameter (mm), diameter inside the coils (mm), the number of coils that are free to move and the travel required.

You must purchase a voucher code to use this calculator.  The voucher code will be emailed to you after purchase and can only be used once.  Simply click add to cart and proceed through the checkout process.

Also available: Simplified Coil Spring Calculator - find spring rate (in lb/in) of an unindentified spring.