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Tension Calculator

Tension Calculator


Tension Scenario:

Number of Ropes:

Number of Objects Pulled:

Object's Mass:


Flow Rate Calculator

Second Object's Mass:


Third Object's Mass:




Angle α:


Angle β:


Pulling Force:



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This online cable tension calculator will assist you in finding tension in a rope or string required to lift an object. Besides, you would also be able to understand the acceleration of the physical object with which it is displaced while being tied with the rope.

So if you are wondering about how to find tension force or what parameters do have an effect on this physical phenomenon, you are at the right place. Keep going through the article below to get answers to any queries arising in your mind regarding tension.

Stay focused!

What Is Tension Force?

In the context of physics:

“A particular axial force that travels through a weightless object like rope to hold heavy things against gravity is known as the tension”

Tension is a very important physical phenomenon that follows Newton’s third law of motion that is “To every action, there is an equal but opposite reaction”. Usually materials with high tensile strength are utilised when you need to carry and displace heavier objects. Our online physics tension calculator allows you to figure out the force of tension that is necessary to lift the objects being in a state of rest, no matter how heavy they are. Otherwise, if the objects are in changing accelerated motion, they keep on changing their direction even if the velocity remains constant. This is where the acceleration changes that could be figured out by using another acceleration calculator.

Changing Acceleration of Bodies:

In the above paragraph, we have discussed variation in acceleration. Here one more factor to consider is the Newton’s second law of motion that lets us know if the force applied on an object displaces it, it will be equivalent to the mass and acceleration product and is given a s follows:

$$ F = m*a $$

Keep in mind that if the massive bodies get dittach from the rope, they will continue to fall freely under the action of the gravitational pull. And this freefall motion can be analysed by using the free fall calculator.

Also, we need to consider one more factor here. Which is that we can also consider the object in vacuum where even the mass appears to be zero. Even in this condition, this free cable tension calculator physics will let you understand how much force of tension is acting on the object.

Tension In Rope Attached to Mass:

One Rope:

Let us consider the following phenomenon as under:


In the above figure, there is a mass attached to the string and is lifted against gravity. At this point, it is affected by a couple of forces, one is tension and other is the weight. And as the object is in stationary condition, the overall effect of both of these forces becomes zero that is given mathematically as below:

$$ ΣF = 0 = T + \left(-W\right) $$

As the above tension equation physics is the basic form of horizontal tension formula and contains two forces against each other, we can move one of these to the other side of the equation to verify that both of them are also equivalent to each other. And this equivalency is what keeps the object in the state of rest that is stationary. Our free online tension calculator physics also goes for finding tension in such a state. And the above formula becomes:

$$ T = W $$

Two Ropes:

Now look at the figure below:


In the pictorial representation, we have the same mass attached to a couple of strings. Now in this condition, the overall tension in both ropes depends upon the angles of the strings and the components of the angles in terms of trigonometric ratios. As we know only vertical components are there along which the tension acts, we will consider them here for computations:

$$ ΣF = 0 = T_1y + T_2y + (-W) $$

$$ W = T_1y + T_2y $$

$$ \text{Horizontal Components} = T_1x, T_2x $$

$$ \text{Vertical Components} = T_1y, T_2y $$

Now in terms of the trigonometric ratios, we have another expression of these vertical components:

$$ T_1y = T_1 * sin\left(α\right) $$

$$ T_2y= T_2 * sin\left(β\right) $$

$$ W = T_1 * sin\left(α\right) + T₂_2 * sin\left(β\right)

Coming to the horizontal components of the angle that are given above, they tend to become zero as there will be no motion along this axis when the mass is lifted by a rope. And in this condition, the best online physics tension calculator will let you observe the force of tension along the vertical axis only. However, we will go through the trigonometric ratios as described for the parallel plane as well:

$$ T_1x = T_2x $$

$$ T_1 * cos\left(α\right) = T_2 * cos\left(β\right) $$

Now dividing the whole above tension equation physics by the term \(cos\left(\alpha\right)\) will generate new expression for T_1 in terms of T_2

$$ T_1 = T_2 * \frac{cos\left(β\right)}{cos\left(α\right)} $$

Now the overall sum of forces in terms of weight is given as below:

$$ W = T_1 * sin\left(α\right) + T_2 * sin\left(β\right) $$

$$ W = T_2 * [\frac{cos\left(β\right)}{cos\left(α\right)}] * sin\left(α\right) + T_2 * sin\left(β\right) $$

$$ W = T_2 * [\frac{cos\left(β\right) * sin\left(α\right)}{cos\left(α\right) + sin\left(β\right)}] $$

$$ T_2 = \frac{W}{[cos\left(β\right) * \frac{sin\left(α\right)}{cos\left(α\right) + sin\left(β\right)}]} $$

Similarly for T_1, we have:

$$ T_1 = \frac{W}{[\frac{cos\left(β\right) * sin\left(α\right)}{cos\left(α\right) + sin\left(β\right)}] * [\frac{cos\left(β\right)}{cos\left(α\right)}]} $$

$$ T_1 = \frac{W}{[\frac{cos\left(β\right) * sin\left(α\right)}{cos\left(α\right) + sin\left(β\right)}] * [\frac{cos\left(β\right)}{cos\left(α\right)}]} $$

$$ T_1 = \frac{W}{[\frac{cos\left(α\right) * sin\left(β\right)}{cos\left(β\right) + sin\left(α\right)}]} $$

How to Calculate Tension?

Get going to have a look at the examples below to understand the concept of the topic in more detail. Stay focused!

Example # 01:

Suppose Jack lifts up a mass of about 45 kg with the help of a rope. Considering the acceleration zero, how to calculate tension force?


Finding tension:

$$ \text{Tension formula} = T = m*a + m*g $$

$$ \text{Tension formula} = T = 45*0 + 45*9.8 $$

$$ \text{Tension formula} = T = 441N $$

You can also verify the values by using our free rope tension calculator physics.

How Tension Calculator Works?

Get through the guide below that will let you understand the working pattern of this free tension force calculator. Keep reading!


  • From the first drop-down list, select the tension scenario
  • After making a selection, go for entering all the required parameters in their respective fields
  • Also, select the unit against each parameter entered
  • At last, hit the calculate button


The calculator helps in:

  • Finding tension
  • Determining acceleration
  • Figuring out components of tension force and tension itself as a whole


How does tension change frequency?

Tension has a direct relationship with that of the frequency via a network of wave speed. This is because when the tension increases, the wave speed increases and hence it enhances the frequency vibration of the overall scenario.

Is centripetal force equal to tension in string?

The actual difference among the tension in the string and object’s weight gives us the equivalent centripetal force. And if you are willing to carry out circular motion force calculations, you can also do this with another centripetal force calculator.

What is the tension in the string at the top of the circle?

When you tie an object with a string and revolve it with full force, the tension at the top becomes very less while its maximum value can be obtained through using this rope tension calculator pulley that is in actuality at the bottom.

What does it mean that tension is zero?

Zero tension is only caused in a rope without making it in contact with any object. This is because the rope is almost massless on which no gravity force does act and that is why it experiences no tensional force.

What happens to tension as radius increases?

As you keep on increasing the radius of the circle, the form of tension goes on decreasing that could be estimated as well by this free force of tension force calculator.

Is tension negative or positive?

Yes it can be! No matter what side of the string is taken positive, you will always get the same results whether utilising the tension calculator or manually.

What is the origin of tension force in a string?

It is the applied force that causes the tension in the string. When an object is tied to a string, it experiences a gravitational pull on it and the rope causes a corresponding force of pull in upward direction against the gravity. This force is directly proportional to the tension in the string and its principal cause.

How do I find tension in two ropes at the same angle of suspension?

If such a condition arises when the suspension angle for the ropes become equal, the tension in both of them also becomes equal.

Is tension a contact force?

Yes definitely! As the force of tension travels from one end to another through a massless rope, it is considered as the contact force.

Why tension force is electromagnetic?

Tension is an electromagnetic force that is actually arisen in the rope due to electromagnetic interactions among the molecules or atoms of the string, magnet or rope.

Is tension a form of energy?

No it is not! This is due to its non-conservative nature that makes its potential energy absolutely zero.


Tension is an axial force that is equivalent to stress generated by the string or rope and has very vast applications in mechanical engineering and other such disciplines. And because of the importance of the concept for dragging the heavier objects and lifting them up, we have designed this free pulley tension calculator with angle so that the amount of tension can easily be detected for a specific rope type.


From the source of Wikipedia: Tension (physics), System in equilibrium, System under net force

From the source of Khan Academy: The force of tension, Super hot tension, Tension in an accelerating system and pie in the face, Mild and medium tension

From the source of Lumen Learning: Normal Force, Tension, and Other Examples of Forces, Normal Force, Tension, Real Forces and Inertial Frames, Problem-Solving Strategies