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Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Outer Diameter:

to

inches mm

Inner Diameter:

to

inches mm

Free Length:

to

inches mm

Wire Diameter:

to

inches mm

Total Coils:

to

Rate: ? Spring rate or spring constant: The amout of force required to move the spring 1 inch of distance or in millimeters the amount of force required to move the spring 1 millimeter of distance.

to

lbs/in N/mm

Info! Please fill in one or more fields to narrow down your search.

Max. Load: ? The maximum amount of force or load you can place on this spring. If you put more force than this you will distort or fatigue the spring.

to

lbs N

Max. Deflection (Max. Travel):

to

inches mm

Solid Height:

to

inches mm

* Required Field

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Outer Diameter:

to

inches mm

Length Inside Hook:

to

inches mm

Wire Diameter:

to

inches mm

Info! Please fill in one or more fields to narrow down your search.

Max. Load: ? The maximum amount of force or load you can place on this spring. If you put more force than this you will distort or fatigue the spring.

to

lbs N

Max. Deflection (Max. Travel):

to

inches mm

Initial Tension: ? The force required to seperate the coils of an extension spring before the spring will extend.

to

lbs N

Rate: ? Spring rate or spring constant: The amout of force required to move the spring 1 inch of distance or in millimeters the amount of force required to move the spring 1 millimeter of distance.

to

lbs/in N/mm

* Required Field

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Outer Diameter:

to

inches mm

Inner Diameter:

to

inches mm

Free Position or Leg Position in degrees: ? Free Position or Leg Position in degrees

degrees

Total Coils:

to

Wire Diameter:

to

inches mm

Body Length:

to

inches mm

Info! Please fill in one or more fields to narrow down your search.

Max. Torque: ? The amount of force applied to a torsion spring to radially move the springs leg a certain amount of degrees.

to

lbs N

Max. Deflection (Degrees of travel):

to

degrees

Rate: ? Torsion spring rate is the amount of radial force required to move the spring 360 degrees of distance. Divide the spring rate by 360 degrees to get the rate per degree

to

in-lbs./deg. N-mm/deg.

Leg Length: ? Both legs are equal in length

to

inches mm

* Required Field

Attention! Input results shown will be +/- 10% from middle value. Hint: The closer your min and max inputs are, the more accurate your results will be!

Small Outer Diameter:

to

inches mm

Large Outer Diameter:

to

inches mm

Free Length:

to

inches mm

Info! Please fill in one or more fields to narrow down your search.

Rate: ? Spring rate or spring constant: The amout of force required to move the spring 1 inch of distance or in millimeters the amount of force required to move the spring 1 millimeter of distance.

to

lbs/in N/mm

Total Coils:

to

Solid Height:

to

inches mm

Wire Diameter:

to

inches mm

Find Spring Constant k Units Calculator

Looking to determine the spring constant (k) for a specific spring? You're in the right place. The spring constant, denoted as 'k,' represents the rate of force required to move a spring over a defined distance. This distance can be either in inches or millimeters, depending on your preference. With the spring constant units in either inches or millimeters, you can easily calculate the spring force for your specific needs. To find the spring constant, you'll need to have a few key values handy: the shear modulus of the material, spring wire diameter, outer diameter, number of active coils, and Young's modulus of the material. We've provided the spring constant formula on this page, or you can take advantage of our spring constant calculator below. Using our spring calculator, you can determine your effective spring constant and access all the answers related to your springs.

Spring Constant Units Formula Equation

k = Gd^4 /[8^3D na]
G = E/2(1 + V)
d = D outer - d

If Spring constant is 1 LBF/inch

it takes 1 lb of force to travel

1 inch of distance

1 LBF/INCH=1LB of force per 1 inch of travel distance

WHERE

  • G = Shear modulus of material
  • d = Spring wire diameter
  • D = Outer diameter of spring
  • na = number of active coils
  • E = Young's modulus of material
  • V = Poisson's ratio of material
    • Please note, G is determined by the material's Young's modulus (E) and Poisson's ratio (V). The spring constant is expressed in units of force per inch (LBF/inch), indicating the amount of force required to move the spring one inch.

    In simple terms, if your spring constant is 1 LBF/inch, it means it takes 1 pound of force to compress or extend the spring by 1 inch.

    We encourage you to use our Spring Creator 5.0, a cutting-edge tool that simplifies these complex calculations and provides you with quick and accurate results. By utilizing this innovative resource, you can easily determine your spring's spring constant and make informed decisions about your spring design.

    Unleash the power of Spring Creator 5.0 and experience the ease and accuracy of calculating your spring constant and other essential parameters. Make informed decisions and enjoy the benefits of precise spring design. Try Spring Creator 5.0 today!