# Calculate average speed

### What is the speed calculator for?

A speed calculator helps us to know the exact speed at which a mobile, like our car, moves. With this calculator we can obtain the speed data from the distance we have traveled in a given time, as well as the time we have spent on this route.

Once we have these two parameters, it is enough to enter the data in the calculator and obtain the speed of that movement. It is important to know that the calculator is used to calculate the average speed of the movement, taking as a basis the parameters of time and total distance. However, it is also possible to calculate the distance traveled if we have as data the average speed and the travel time. As long as we have two pieces of data, we can calculate the third one that is missing.

### How is speed measured, in what unit?

The unit in which the speed is measured depends on how slow or how fast the mobile we are evaluating moves. In the international system of units there are two references for this purpose. One of them is meters per second (m / s), used for example in physical calculations and the like. However, the most common unit when measuring vehicle displacement is kilometers per hour (km / h).

For its part, the imperial system of units, used in the United States, the United Kingdom and a few other countries, has two different measures. One of them is feet per second, similar to meters per second in the International System. For its part, kilometers per hour are converted into miles per hour, since the mile is the unit that replaces the kilometer in this system of units.

### What are the types of speed

If we turn to any physics manual, we will see how there are various types of speeds. However, in the automotive world some very specific ones are used, which we will list below.

Instantaneous speed: Instantaneous speed is the speed of a vehicle at a given time. The best of all is that this speed does not require any calculation, but is what the speedometer of our vehicle marks us. So if we were driving on a highway at 120 kilometers per hour, this would be our instantaneous speed at that moment.

Average speed: Average speed gives us the relationship between the distance traveled and the time used to travel it. It is a good reference to evaluate long trips or in which the instantaneous speed does not matter so much. It can be easily calculated using our speed calculator.

Average speed: This magnitude should not be confused with the average speed, as they have nothing to do with it. This average is calculated by adding the initial and final speed of a vehicle in a specific interval and dividing that amount by two. If the initial speed is 90 kilometers / hour and at the end it is 130 km / h, the average speed would be 110 kilometers per hour.

### Average speed formula

To calculate the average speed of a trip, we will need to know the total time of the trip as well as the distance traveled. The specific formula would be the following:

Average Speed ​​= Distance Traveled / Time Traveled

It is important that the units are correct, so that the distance is represented in kilometers and the time in hours. If necessary, we must convert the units to those indicated before making the calculation.

Once the units are ready, we divide the total distance in kilometers by the total time of the trip. The result is the average speed of this journey in kilometers per hour. By the way, from this average speed we can calculate the time per kilometer traveled, since the formula to calculate the time per kilometer is a derivative of the average speed. To proceed, we will divide the unit time (one hour, one minute, etc.) by the total number of kilometers traveled in this time.

As an example, for a speed of 100 kilometers per hour, the time per kilometer will be 0.01 hours. If we want to convert that time to minutes, we would only have to multiply the result by 60, repeating the step to convert from minutes to seconds. In our example, we would talk about 0.6 minutes or 36 seconds per kilometer.

### Average speed vs average speed

Average speed and average speed are two similar terms and they tend to get confused. However, they are not the same. The main difference has to do with the type of unit used in each of them. In the case of speed, we speak of a scalar quantity that represents the distance traveled in a certain time. In the case of speed, we speak of a vector quantity, which represents the displacement of the vehicle. This displacement implies a distance but also a direction, so the movement can be positive, negative or even zero.

To understand it better, let’s look at an example. Consider a vehicle that departs from point A and travels a distance of 100 kilometers in an hour, but on a circular route that ends where it begins. In this case, the speed would be 100 kilometers per hour, which is the distance it has traveled. However, the speed would be 0, because the vehicle is in the same place as it was initially.

### Frequent questions

What is the most economical driving speed?

This is one of the most common questions drivers ask themselves and one of the most controversial. Although there is no exact type speed that guarantees a more efficient operation, it is true that the higher the gear at which the vehicle circulates and the lower the number of revolutions, the lower its consumption. For this reason, there is a certain consensus that places this economic speed at around 100 kilometers per hour.

On the other hand, it is true that it is best to maintain a constant speed on the road and not press the accelerator excessively, since the faster the engine turns, the greater the consumption. For reference, traveling at 120 kilometers per hour instead of 100 km / h can increase consumption by 20%, so driving at the correct speed is key to saving fuel.

How to calculate km / h in seconds?

To calculate kilometers per second starting from kilometers per hour we just have to divide the speed we have by 3,600. If a vehicle travels at 120 kilometers per hour, dividing this figure by 3,600 we obtain a speed of 0.033 kilometers per second. If you don’t want decimals, you can convert the figure to meters, multiplying the result by 1,000. In our example, the speed would be 33 meters per second.

How to convert miles per hour to km per hour?

To convert miles per hour into kilometers per hour, simply do a simple multiplication to unify the element that differs between the two formulas. Since a mile has an extension of 1.609 kilometers, to convert a speed in miles per hour to kilometers per hour simply multiply it by 1.609. As an example, a vehicle traveling at 50 miles per hour would roll at 80.467 kilometers / hour (50 x 1.609 = 80.467).