Calculate the spring constant of a spring using Hooke’s Law. Enter the spring displacement and force on the spring to calculate the spring constant. (Also known as spring rate calculator). This calculator can also determine the force or displacement given the spring constant and other variable.

Hooke’s Law Formula

The following is Hooke’s law formula for determining the spring constant of a spring:

 F = -k*x 
  • Where F is the force (N)
  • k is the spring constant (N/m)
  • x is the displacement (m) (positive for displacement, negative for compression)

To calculate a spring constant, divide the spring force by the spring displacement.

Spring Constant Definition

A spring constant is a measure of a spring’s ability to resist compression and elongation. The higher the spring constant, the harder it is to compress or stretch it.

This value is also a measure of elasticity. That is, elasticity is directly related to the force constant. The higher the elasticity, the lower the spring constant. The force and displacement are proportional so if graphed against one another, it would yield a straight line.

Taking another look at the equation above it can be seen that there is a negative sign in the equation. This is to take into account the direction of displacement. Displacement can be positive if the spring is being pulled in tension, or negative if the spring is being compressed.

How to calculate a spring constant?

How to Calculate a spring constant

  1. First, the formula for Hooke’s law must be manipulated to solve for k, the spring constant

    To do this, we simply divide both sides by -x. This yields the equation k = -F/x.

  2. Next, we must measure our first variable

    In this case, we will first measure the force acting on the spring. In most spring applications this is done directly via a gauge. Sometimes it’s also provided in a problem. For this example, we will assume 10 Newtons.

  3. Next, we must measure the displacement

    As is the case with the force, when springs are involved this displacement is almost always measured directly or given in the problem. For this example we will say the displacement is -1 meter, meaning the spring is in compression.

  4. Finally, enter all of the information into our formula

    k = -F/X= -10/-1 = -10. The spring constant 10 N*m.

  5. Analyze the results

    Analyze the results for accuracy and apply what’s been learned to future problems.


Can the spring constant change?

In simple cases the spring constant does not change, however, if analyzed more closely, the spring constant can change depending on other factors such as temperature and whether the spring is in tension or compression.

Is displacement positive or negative?

Displacement can be either positive or negative depending on whether the spring is in compression or tension.

How do you find the spring constant?

Finding the spring constant is a matter of basic physics. The formula for finding the spring constant, K, is:


where F is the force exerted by the spring, m is the mass, K is the spring constant and x is the displacement of the spring. In other words, if you pull on your length of spring and measure how much force it takes to stretch it a certain amount (you can use a Vernier caliper to measure displacements), you can then calculate what your spring constant would be using this formula.

What is Hooke’s Law calculator?

Hooke’s Law Calculator is used to calculate the amount of force (F) between two objects or surfaces. The law states that for elastic materials, the Force is proportional to the displacement (x).

What is a normal spring constant?

In general, a high spring constant indicates a stiffer spring, whereas a low spring constant indicates that the spring will be more flexible.

How do you calculate spring constant GCSE?

Example: You have a 0.5 m long metal coil with a spring constant of 3 N/m and you want to know how much force it will take to stretch it by 50 mm.

Spring Constant = Force / Extension Spring Constant = 3 N/m / 0.5 m Spring Constant = 6 N Force = 6 Newtons Force = 6 x 10-3 kg Mass of Coil      = 0.5 kg Extension = 50 mm Work done      = 50

What is the spring constant GCSE?

When a spring is stretched, this increases the potential energy stored within it. If a force is exerted upon the spring when it is stretched from its initial equilibrium position, this force will be stored as potential energy in the form of an increase in the distance between the springs ends as well as an increase in its bending moment about its central axis.

When a spring is compressed, the same process occurs but in reverse. The potential energy is now being stored as a decrease in distance between its ends and a decrease in its bending moment about the central axis.

Can a spring constant be less than 1?

Yes, in fact, the spring constant k can be any value.

A spring’s force is determined by its stiffness, which is a material property of the spring. For example, a stiffer spring will exert more force for the same deflection than a weaker one. However, the relationship between deflection and force is non-linear: doubling the deflection does not necessarily mean doubling the force.

What is a strong spring constant?

A strong spring constant is often considered values above 5.

What is the standard spring constant?

The standard spring constant (k) is the spring constant in Hooke’s law, which can be expressed as


What is the spring constant k units?

The SI unit of k is newton per meter (N/m). In U.S. customary units, k is lbf/in.

What is K in spring energy?

Common K in spring energy is the amount of spring energy stored in a spring. It is directly proportional to the stiffness of the spring and its mass.

How do you find the spring constant with elastic potential energy and extension?

If you take the potential energy as V=1/2kx^2, where x is the distance from your original position, then it’s an integral with respect to x to solve for k.

Is spring constant the same as elastic potential energy?

The spring constant is not the same as the elastic potential energy. The spring constant is a parameter that can be used to describe the stiffness of a spring and is normally represented by the symbol k.

The elastic potential energy is the stored energy in an elastic object when it is stretched or compressed. You can also think of it as stored mechanical energy.

What is a large spring constant?

A large spring constant is a term used to describe a spring which has very little deflection when there is only a small amount of force applied.

What is a good spring constant?

A good spring constant is that which achieves the desired stiffness that your application is looking for.

What is the highest spring constant?

The highest spring constant is the value of the spring constant which gives the maximum value of force.

Can the spring constant be positive?

Spring Constants can be positive with the right frame of reference in mind.