Rocket Equation Calculator

The Rocket Equation Calculator is a free tool that calculates the change in velocity based on input parameters such as exhaust velocity, starting, and end mass of rockets, and so on. This free application will make your computations easier, and the results will appear in a flash.

Choose a Calculation
Effective exhaust velocity
Initial mass
Final mass:

Rocket Equation Calculator: Are you looking for a way to calculate the motion of vehicles that follow the rocket's principle? If that's the case, you can use our Rocket Equation Calculator to determine associated parameters. To get instant results, simply enter the inputs in the calculator tool's designated fields and click the calculate button. Continue reading to learn more about the Tsiolkovsky Rocket Equation, Formula, and Multi-Stage Rocket Equation, among other things.

What is meant by Rocket Equation?

Rocket Equation describes the motion of a device that applies acceleration to themselves using thrust. It describes the relationship between velocity of rocket, exhaust velocity, mass. We can use the Rocket Equation in simple cases when no other external forces act on it.

How to find Change in Velocity?

Follow the simple guidelines provided below to determine the change in velocity using Rocket Equation. They are as such

  • Firstly, determine the exhaust velocity, initial mass, final mass.
  • Then, simply input the known parameters in the formula to find the change in velocity i.e. Δv = ve * ln(m0 / mf).
  • On simplification you will get the change in velocity.

Rocket Equation Formula

Velocity of Rocket can be found using the formula

Δv = ve * ln(m0 / mf)

In which Δv stands for Change of Velocity

ve is effective exhaust velocity

m0 is the initial mass including rocket weight and propellants

mf is the final mass including rocket weight without propellants

Δv is the difference between final and initial velocity

Greater the ve and m0 the higher velocities you can get.


If the effective exhaust velocity is 5,400 km/h, initial mass is 45 t, final mass is 20 t calculate the change in velocity?


Given that

Effective Exhaust Velocity = 5,400

Initial Mass = 45 t

Final Mass = 20 t

We know formula for Change in Velocity Δv = ve * ln(m0 / mf)

Substitute the input values in the formula Δv = 5400 * ln(45 / 20)

On simplification we get change in velocity Δv = 1.2164 km/s

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Multistage Rocket Equation Formula

During the motion of the rocket many parts are rejected one after the other. For suppose a part runs out of fuel it becomes redundant mass and needs to be removed. Change of velocity can be found independently for every step and then linearly sum up Δv = Δv1 + Δv2 + .... One Advantage of using this is we can employ a different type of rocket engine tuned for different conditions.

Frequently Asked Questions on Rocket Equation Calculator

1. How do you calculate delta V for a rocket?

You can calculate the delta v or change in velocity by using the formula Δv = ve * ln(m0 / mf).

2. Who invented the Rocket Equation?

Russian Scientist Konstantin Tsiolkovsky invented the rocket equation in the year 1903.

3. Why Tsiolkovsky rocket equation is called an ideal rocket equation?

Tsiolkovsky rocket equation can be used in simpler cases i.e. when no external forces act on the rocket. Therefore, it is called an ideal rocket equation or classical rocket equation.

4. What does the Rocket Equation Tell Us?

Rocket Equation is a mathematical equation that describes the motion of vehicles following rocket principle i.e. devices that can accelerate themself using thrust.

Rocket Equation Calculator

What does the term Rocket Equation mean?

The motion of a device that uses propulsion to apply acceleration to itself is described by the rocket equation. It describes the link between the rocket's velocity, the velocity of its exhaust, and the mass of the rocket. When no other external forces are acting on it, we can utilize the Rocket Equation.

How to find the Velocity Change?

To use the Rocket Equation to calculate the change in velocity, follow the easy instructions below. As so, they are.

  • Calculate the exhaust velocity, initial mass, and final mass.
  • Then, to get the change in velocity, just plug in the known values into the formula: Δv = ve * ln(m0 / mf).
  • You'll get the velocity change if you simplify it.

Rocket Equation Formula

Rocket velocity Formula is given by the expression Δv = ve x ln(m0 / mf)

  • Where, Δv = Change of Velocity
  • ve = effective exhaust velocity
  • m0 = initial mass of the rocket, including its weight and propellants
  • mf = the total mass of the rocket, excluding propellants
  • Δv = difference between final and initial velocity
  • Higher velocities can be achieved by increasing ve and m0.

How to Use the Rocket Equation Calculator?

The procedure for using the rocket equation calculator is as follows

  • Step 1: In the appropriate input areas, enter the unknown value of exhaust velocity, rocket starting and end masses, and x.
  • Step 2: To obtain the result, select "Calculate the Unknown" from the drop-down menu.
  • Step 3: Finally, the output field will display the change in velocity.

Multistage Rocket Formula

Several sections are rejected one after the other as the rocket moves. For example, if a component runs out of fuel, it becomes a redundant mass that must be removed. Changes in velocity can be determined independently for each step, then added together linearly as Δv = Δv1 + Δv2 +... One benefit of doing so is that we can use several types of rocket engines that are tailored for different conditions.

For more concepts check out to get quick answers by using this free tool.

Problems on Rocket Equation

Question 1: Calculate the change in velocity if the effective exhaust velocity is 6,200 km/h, the initial mass is 55 t, and the final mass is 30 t.


Given: Effective Exhaust Velocity = 6,200

Initial Mass =55 t

Final Mass = 30 t

Change in Velocity Δv = ve x ln(m0 / mf)

Put the input values in the formula Δv = 6200 x ln(55 / 30)

Δv = 3.758 Km/s

FAQs on Rocket Equation

1. Why is the Tsiolkovsky rocket equation referred to as an ideal rocket equation?

When no external forces are acting on the rocket, the Tsiolkovsky rocket equation can be employed. As a result, it's referred to as an ideal rocket equation or a classic rocket equation.

2. What Can We Learn from the Rocket Equation?

The Rocket Equation is a mathematical equation that defines the motion of vehicles that operate on the rocket principle, that is, devices that can accelerate themselves by thrust.

3. How much thrust is required by a rocket?

To do so, it must generate 3.5 million kilos (7.2 million pounds) of thrust! The shuttle becomes lighter as the fuel burns, and less effort is required to propel it upward, so it accelerates!

4. In a rocket, how do you measure trust?

Strain gauge load cells are used to measure thrust, and they are calibrated in place using a separate transfer standard strain gauge load cell or a dead weight. The flow rate of propellant is usually measured with volumetric or mass flow metres.

5. What is the fuel consumption of a rocket?

The two Solid Rocket Boosters burn 11,000 pounds of fuel per second during liftoff. That's two million times the rate at which the average family automobile consumes petrol.